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Effect of Copaiba Oil (Copaifera spp.) on Intake Digestibility, Degradability, and Ruminal Variables in Beef Steers

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10 December 2024

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11 December 2024

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Abstract
This study evaluated the effect of copaiba oil (COP) or sodium monensin, used as nutritional additives for beef cattle. Five steers cannulated in the rumen were assigned to a 5 x 5 Latin square design to the COP treatments: Control - (0 g of COP), 1.25 g COP, 2.50 COP, and 3.75 g COP per kg-1 dry matter (DM) or monensin (concentrate with the addition of 40 mg kg-1 of sodium monensin (DM basis) of total diet. The COP did not affect intake and digestibility. Monensin decreased (P ≤ 0.05) DM and nutrients intake; however, it did not affect digestibility compared to control treatment. Conversely, the monensin supply provided lower (P ≤ 0.05) mean pH values and, increases in the concentrations of N-NH3 and propionate (mmol L-1). The increased propionic acid production resulted in higher (P ≤ 0.05) proportions (mmol 100 mmol-1) of propionate, and reduction in the molar proportions of acetate and butyrate, with a consequent reduction in the acetate:propionate ratio. Copaiba oil in 1.25 to 3.75 g kg-1 does not alter the ruminal metabolism of cattle. However, sodium monensin reduces DM intake and decreases the acetate:propionate ratio in the rumen fluid.
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Subject: Biology and Life Sciences  -   Animal Science, Veterinary Science and Zoology

1. Introduction

Essential oils (EO) and their bioactive compounds have significant potential in ruminant nutrition due to their effects on various microorganisms. Their antimicrobial properties are attributed to the presence of terpenoids and phenolic compounds [1,2,3]. Studies shows different mechanisms of action in the rumen as such as changes in the volatile fatty acid (VFA) profile, nutrients digestibility and, reduction in methane (CH4) and ammonia production [4,5,6].
Copaiba oil is extracted from the tree copaibeira in Brazil (Copaifera spp.), which is a native tree from tropical regions in Latin America and West Africa that produces an oil-resin obtained from the drilling of the trunk [7]. Its composition varies according to the species, commonly presenting about 80% of its active compounds such as sesquiterpenes and 20% as diterpenes. The β-caryophyllene is the sequiterpene present in the highest concentration, representing approximately 50% of the composition in the EO [8].
The combination of sesquiterpenes and diterpenes present in copaiba oil has shown antimicrobial activity observed on several pathogenic microorganisms, mainly gram-positive bacteria such as Staphylococcus spp. and Streptococcus spp. [8,9].
This antimicrobial activity in the copaiba oil might potentially be used as an additive in ruminant diets. However, this potential as a nutritional additive, especially for the manipulation of the rumen environment, is still unknown. Therefore, this study evaluated the effect of the copaiba oil or monensin, as nutritional additives for beef cattle, on intake, digestibility, and in situ ruminal degradability and variables (pH, N-NH3, and VFAs).

2. Materials and Methods

The experiment was conducted at the Animal Metabolism Laboratory of the School of Veterinary Medicine and Animal Science of the Universidade Federal do Mato Grosso do Sul (UFMS) in Campo Grande, MS, Brazil. The study was approved by the UFMS Ethics and Animal Use Committee (CEUA) under protocol No. 639/2014.

2.1. Animals, Management, and Treatments

Five rumen cannulated crossbred steers (1/2 Nellore + 1/2 Holstein) with initial body weight (BW) of 279 ± 22 kg were assigned to a 5 x 5 Latin square design. All steers were housed individually in covered pens with feeders and water troughs.
Animals were fed with chopped hay from Megathyrsus maximus (Syn. Panicum maximum Jacq.) cv. Massai and protein/energy supplementation (Table 1). The concentrate supplement contained ground corn (850 g kg-1), soybean meal (75 g kg-1), urea (25 g kg-1), and mineral premix (50 g kg-1). The experimental treatments consisted of addition of copaiba oil-resin (COP) or monensin sodium ionophore to the concentrate supplement as follow: Control (0 g of COP), COP1.25 (1.25 g of COP), COP2.50 (2.50 of COP), and COP3.75 (3.75 g of COP) per kg of DM of the total diet, respectively). Furthermore, monensin (40 mg of sodium monensin per kg-1 DM of the total diet) was also evaluated as positive control. The additives were weighed daily and used based on the previous day’s feed intake. The inclusion of the additives was right before feed providing.
The roughage was supplied ad libitum twice daily at 7:00 a.m. and 5:00 p.m. The amount of roughage offered was adjusted daily to maintain refusals of approximately 150 g kg-1. The concentrate supplement was supplied in the amount of 15 g kg-1 BW once a day at 7:00 a.m. in a separate feeder. The diet met the nutritional requirements of growing cattle with an expected average daily gain of 1 kg d-1 [10].
The experiment lasted for 105 days and was divided into five experimental periods of 21 days. The animals were adapted to the treatments for 14 days and samples were collected in the last seven days/period. At the beginning of each experimental period, the animals were weighed after 14 hours of solids fasting to adjust the amount of concentrate supplement offered.

2.2. Nutrient Intake and Apparent Digestibility

The DM and nutrient intake were evaluated from days 15 to 19 of each experimental period. At the same period total feces were collected from each animal immediately after defecation. The feces samples were weighed and homogenized, and 100 g kg-1 were stored at -20 ° C for further analysis.
Nutrient’s intake (amount offered - refusal) and apparent digestibility coefficients ((ingested nutrient - excreted nutrient)/ingested nutrient) of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber corrected by ash and protein content (apNDF), acid detergent fiber corrected by ash and protein content (apADF), ether extract (EE), and non-fiber carbohydrates (NFC) were estimated.

2.3. In Situ Degradability Assessment

Ruminal disappearances of DM and NDF were performed between days 15 to 19 in each experimental period using 50 μm porosity nylon bags (7 x 14 cm). These bags were weighed empty and received 5 g of hay (grounded in 2 mm sieve). These bags were introduced in the rumen 7 hours (before feeding) and removed after the incubation times (3, 6, 12, 24, 48, 72, 96, and 120 hours). The procedures of ruminal disappearance were performed as described in Cortada Neto et al. [11].
The DM soluble fraction (“a”), the potentially insoluble degradable fraction (“b”), the degradation rate (“c”), and the effective degradability (ED) of the DM and NDF were calculated according to Ørskov and McDonald [12], based on the equation: ED = a + (bxc)/(c + k), where “k” corresponds to the estimated ruminal solids passage rate, considered in the present study as 0.05 h-1 as suggested by Huntington and Givens [13]. The potential degradation of DM and NDF was considered to be the one in which degradation stabilized over the incubation times.

2.4. Ruminal Fluid Sampling

Ruminal fluid samples were collected to determine the VFA’s profile, pH, and N-NH3 on the last two days of each experimental period. During this period, samples were taken at four-hour intervals to obtain representative samples of the zero-hour (before morning feeding), 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, and 22 hours after the morning feeding. Ruminal fluid was collected manually (via cannula) in aliquots of approximately 100 mL, at different rumen sites, and filtered through a cotton diaper. The rumen pH was measured immediately after sampling (B474; Micronal, São Paulo, SP, Brazil). For VFA profile, 4 mL of ruminal fluid was acidified with 1 mL of metaphosphoric acid (25%) and stored at -20 °C for further analysis. The N-NH3 was determined in 50 mL aliquots of ruminal fluid acidified with 1 mL of H2SO4 (50%) and stored at -20 °C.

2.5. Chemical Analysis

The chemical composition evaluations of the diets, refusals, and feces were evaluated according to the AOAC [14]: DM (method 967.03), crude protein (CP, method 981.10), ether extract (EE, method 920.29), and ash (method 942.05). The NDF and ADF contents were analyzed using the Tecnal TE-149® fiber determinants (Tecnal, Piracicaba, SP, Brazil) through 5 x 5 cm non-woven bags (NWF) and 100 μm porosity, with 0.5 g of sample per bag. These determinations were according to the methodology of Van Soest [15], using thermostable amylase (Termamyl 120 L Novozymes A/S, Bagsvaerd, Denmark). The NDF and ADF contents were subsequently corrected for the presence of ash and protein (apNDF and apADF, respectively). The same procedure was performed to evaluate the NDF content of the material resulting from the in situ ruminal degradation. However, this analysis did not include the use of thermostable amylase, and correction for ash and protein was not performed.
The non-fiber carbohydrate (NFC) content of forages was calculated as proposed by Sniffen et al. [16], using the equation: NFC = 100 - (CP + ash + apNDF + EE). The concentrate supplement content was calculated as proposed by Hall [17], using the equation: NFC = 100 - ((CP - CP derived from urea + inclusion of urea) + MM + apNDF + EE).
The N-NH3 content was obtained in the supernatant of ruminal fluid samples after thawing by 2N KOH distillation according to an adaptation of the method described by Fenner [18], conducted by Ribeiro et al. [19]. The concentration of VFA’s was determined by gas chromatography (Shimadzu GC-2010, Kyoto, Japan) according to the methodology described by Erwin et al. [20].

2.6. Statistical Analyses

Statistical analyses were performed using the GLIMMIX procedure in the SAS statistical software (SAS University Edition, SAS Institute Inc., Cary, NC, USA), with the Satterthwaite approximation, to determine denominator degrees of freedom for fixed effects. Nutrient intake and apparent digestibility data were analyzed using a 5 x 5 Latin square design. The statistical model used was: Yijk = μ + Ti + Pj + Ak + eijk; Where: Yijk = observation of treatment effect i in the period j, of animal k, μ = overall average, Ti = treatment effect i, in which i = 1 (control), 2 (COP1.25), 3 (COP2.50), 4 (COP3.75), and 5 (Monensin); Pj = period effect j (j = 5 periods); Ak = animal effect k (k = 5 animals), and eijk = random error associated with each observation.
For the in-situ degradation of DM and NDF and the ruminal pH and N-NH3, a Latin square design with subdivided plots was considered, where the plots were the treatments, and the subplots were incubation times of rumen samples or the different ruminal fluid sampling times. The model included effects from treatment, incubation time, animal, period, and treatment x time for the in-situ DM and NDF degradation rates. For the pH and N-NH3 ruminal variables, the statistical model included effects from treatment, sampling times, animal, period, and treatment x time. The statistical model used was: Yijkl = μ + Ti + Hj + Ak + Pl + (TH) ij + eijkl; Where: Yijkl = observation of the treatment effect i for incubation hours (degradation rate) or collection time (ruminal variables) j in animal k; μ = overall average; Ti = effect of treatment where i = 1 (control), 2 (COP1.25), 3 (COP2.50), 4 (COP3.75), and 5 (Monensin); Hj = effect of incubation times for disappearance (j = 1, …, 8) or sampling time for ruminal variables (j = 1, …, 13); Ak = animal effect (k = 1, …, 5), Pl = effect of period (1 = 1, …, 5); THij = interaction between treatment i and time j; and eijkl = random error associated with each observation.
The covariance structure that presented the lowest Akaike information criterion in each analysis for the variables repeated overtime was chosen. The covariance structures used were toepliz (pH) and first-order autoregressive structure (N-NH3, DM and NDF degradation, and VFA’s). When significant differences were observed (P ≤ 0.05) in the F-test (ANOVA), means were compared using the Tukey’s test; differences were considered significant with P ≤ 0.05.

3. Results

3.1. Nutrient’s Intake

The COP (1.25, 2.50, and 3.75 g kg-1) did not affect the intake of hay DM (kg day and g kg-1 BW) when compared to the control (Table 2). Overall, the sodium monensin reduced (P ≤ 0.05) the intake of hay DM (kg day-1 and g kg-1 of BW) and consequently decreased the intake of nutrients. However, monesin did not affect the total CP, total EE, and total NFC (kg day-1; Table 2).

3.2. Ruminal Variables

The COP or sodium monensin did not affect (P > 0.05) the digestibility coefficients of DM, OM, CP, apNDF, EE, and NFC (Table 3).
The COP did not affect DM and NDF degradation; however, the sodium monensin reduced (P ≤ 0.05) the degradation of hay DM and NDF at 24, 48, 72, and 96 hours after incubation compared to the control (Figure 1).
The COP did not affect (P > 0.05) the estimated ruminal degradation parameters of DM and NDF compared to the control (Table 4). However, monensin inclusion decreased (P ≤ 0.05) fractions b and c, and effective degradability (ED) of DM compared to the control (Table 4). The monensin did not affect (P > 0.05) fraction c, however, decreased the degradation (P ≤ 0.05) of fraction b and the ED of NDF fraction compared to the control (Table 4).
The COP did not affect (P > 0.05) the production of VFAs in mmol L-1 or mmol 100 mmol-1 compared to the control (Table 5). However, the monensin increased (<0.0001) propionate production. These increases in propionate production (mmol L-1) when monesin was provided resulted in lower (P ≤ 0.05) acetate and butyrate concentrations (mmol L-1), higher concentration of propionate, and consequently lowest acetate:propionate ratio (Table 5). Interactions (P ≤ 0.05) between sampling times and concentrations (mmol L-1) of acetate, propionate, and total VFA’s were observed. The VFA concentrations were higher in the monensin treatment between the morning and afternoon feedings (Figure 2).
The rumen pH were lower (P ≤ 0.05) when monensin were included between 13 and 21 hours compared to the control (Figure 3). In all treatments, the highest pH values were observed between 9:00 and 11:00 a.m. (two to four hours after feeding), with gradual reduction after this time range (Figure 3).
The COP did not affect (P > 0.05) the N-NH3 concentration in the ruminal fluid compared to the control (Figure 4). The concentration of rumen N-NH3 in the monensin treatment was higher (P ≤ 0.05) than in the COP1.25 and COP2.50 (Figure 4). The highest (P ≤ 0.05) N-NH3 concentrations in all treatments were observed between 11:00 a.m. and 3:00 p.m. (four to eight hours after feeding, Figure 4).

4. Discussion

In the current study, the lack of EO in changes on nutrient intake corroborates results from other studies evaluating the addition of EO to the diet of ruminants [21,22,23]. However, the use of EO as nutritional additives has shown different results on feed intake, which may be associated with high dose variability and the composition of evaluated compounds [24].
The reduction in DM intake with monensin inclusion observed in the present study is well documented in the literature [25]. This effect may occur due to an increase of ruminal propionic acid concentration, which reflects in increased energy efficiency, allowing nutritional requirements to be met with lower levels of feed intake [26]. The magnitude of the reduction in feed intake promoted by monensin is associated with forage digestion, the animal’s ability to store undigested feed, and its energy requirements [27].
The absence of effects in nutrient apparent digestibility when COP was provided is corroborated by similar results found in other study using different levels of COP [28]. The addition of EO commonly reduces ruminal degradation of rapidly fermentable substrates, such as starch and protein, providing changes in their digestion site; however, it does not affect the apparent digestibility in the total digestive tract [29].
Monensin can increase dietary digestibility by increasing the DM retention time in the rumen as the result of lower voluntary intake, stimulating rumination, improving the ruminal environment, and allowing increased digestibility [30]. However, monensin did not affect nutrient digestibility in this study.
The COP did not change the ruminal degradation of hay DM and NDF. The supplementation to non-lactating Holstein cows of 2 mL of allicin, zingiberene, or citral, which are the main active components of garlic, ginger, and lemongrass oils, respectively, resulted in increases of DM and NDF ruminal degradability between 48 and 72 h of incubation [31]. Studies indicate that some EO would mainly reduce the degradation of rapidly degradable substrates, such as starch and protein, due to the inhibition of proteolytic and amylolytic bacteria activity [30,32]. In our study, the observation of this result was not possible due to the high roughage: concentrate ratio (approximately 50:50), low quality of the forage used (low protein content and high NDF content), and low rate of supplement intake by the animals.
The use of ionophores in diets can lead to a reduction in the fiber fraction degradability due to its effect on cellulolytic bacteria, and consequently, reduce DM ruminal degradability [11]. This result supports the observations of reduction in DM and NDF degradation parameters obtained in the present study when sodium monensin was provided to the steers.
The EO has shown potential to change rumen VFA production [33]. In fact, EO may change rumen bacteria profile and this reflects in different patterns of rumen fermentation. Ruminal pH remained above 5.8 in all treatments, a value considered normal for the proper functioning of the rumen [34]; however, the ruminal pH when monensin was provided remained below 6.2 in mostly sampling times, which may impair fiber digestion due to the reduced activity of cellulolytic microorganisms that are sensitive to pH reductions below this limit [35]; this fact may have contributed to lower the DM, and NDF degradability observed in the monensin treatment. The most substantial decrease in rumen pH in the monensin treatment may have been due to lower apNDF, CP intake from lower hay intake. The lower consumption of forage and consequently of fiber results in shorter consumption and rumination times, and consequently reduces animal saliva production, which is mostly responsible for buffering the rumen environment [36].
The change in VFA production caused by monensin, reflecting in lower acetate:propionate ratio, higher propionic acid production, and lower acetate and butyrate proportions is an effect commonly described in the literature and justified by its action against gram-positive bacteria [37]. Gram-positive bacteria that produce acetate, butyrate, and H2 are inhibited by ionophores, and gram-negative bacteria that produce propionate find better conditions to reproduce in the presence of ionophores [38]. Observed interactions may be associated with a slower consumption rate of the diet containing monensin.
The effect of essential oils seems to be pH-dependent, and an increase in antimicrobial activity has been shown with a reduction in pH values. Only the undissociated form of molecules can interact with the lipid bilayer of the bacterial cell membrane, increasing the undissociated form with the decrease in pH, and thus, increasing its hydrophobicity and allowing greater interaction with the bacterial cell membrane [1].
In the present study, the low-quality hay DM intake corresponded on average to 493 g kg-1 of the total feed intake by the animals in the treatments with the COP, maintaining the rumen pH always above 6.3, which may have limited their antimicrobial activity. Studies have shown the antimicrobial activity of COP, especially on gram-positive and antifungal microorganisms [8]. However, under the conditions of the present study, this effect could not be observed. Although the components of COP have the potential to control or limit the growth of several pathogenic and non-pathogenic microorganism species, it did not have an ionospheric effect on the rumen environment, despite the wide range of daily doses. However, the absence of an effect may be due to a rumen environment not conducive to its action, with pH values close to neutrality, and therefore, this should be observed in subsequent evaluations.

5. Conclusions

The addition of COP to the concentrate did not affect the intake, digestibility, ruminal degradability, and ruminal variables in beef cattle. The addition of sodium monensin reduced DM intake, ruminal degradations of DM and NDF, increases propionate production and, reduces acetate: propionate ratio.

Author Contributions

Conceptualization, G.F.; methodology, G.F and F.F.; formal analysis, L.I. and M.V.; investigation, A.B and R.R; writing—original draft preparation, A.B. and A.M.; writing—review and editing, J.S. and G.F.; supervision, G.F.; project administration, G.F.; funding acquisition, G.F. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), grant number 564435/2010-4 and Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul (FUNDECT) grat number TO 014/12.

Institutional Review Board Statement

The study was approved by the ethics committee of the Universidade Federal do Mato Grosso do Sul in Campo Grande under protocol No. 639/2014.

Informed Consent Statement

Not applicable.

Data Availability Statement

The data presented in this study are available on request from the corresponding author.

Conflicts of Interest

The authors declare no conflicts of interest.

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Figure 1. Hay DM degradation (g 100 g-1) in the rumen of cattle receiving different levels of COP or monensin sodium. (a) Vertical bars represent standard deviation. Asterisk (*) indicates treatment differences at that time (P ≤ 0.05). Fraction “a”: 23.16 g 100 g-1. (b) Vertical bars represent standard deviation. Asterisk (*) indicates treatment differences at that time (P ≤ 0.05).
Figure 1. Hay DM degradation (g 100 g-1) in the rumen of cattle receiving different levels of COP or monensin sodium. (a) Vertical bars represent standard deviation. Asterisk (*) indicates treatment differences at that time (P ≤ 0.05). Fraction “a”: 23.16 g 100 g-1. (b) Vertical bars represent standard deviation. Asterisk (*) indicates treatment differences at that time (P ≤ 0.05).
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Figure 2. Treatment time interaction of the supply of different levels of copaiba oil or sodium monensin on rumen VFA’s concentration (mmol L-1). Arrows indicate diet delivery times, and vertical bars represent the standard deviation.
Figure 2. Treatment time interaction of the supply of different levels of copaiba oil or sodium monensin on rumen VFA’s concentration (mmol L-1). Arrows indicate diet delivery times, and vertical bars represent the standard deviation.
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Figure 3. Mean ruminal pH values of cattle at different sampling times, receiving different levels of copaiba oil or monensin sodium. Arrows indicate diet delivery times, vertical bars represent the standard deviation and asterisk (*) indicates treatment differences at that time (P≤0.05).
Figure 3. Mean ruminal pH values of cattle at different sampling times, receiving different levels of copaiba oil or monensin sodium. Arrows indicate diet delivery times, vertical bars represent the standard deviation and asterisk (*) indicates treatment differences at that time (P≤0.05).
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Figure 4. Average of ammonia nitrogen concentration (N-NH3) in the rumen of steers at different collection times receiving different levels of COP or monensin sodium. Arrows indicate feeding time, vertical bars represent the standard deviation and asterisk (*) indicates treatment differences at that time (P ≤ 0.05).
Figure 4. Average of ammonia nitrogen concentration (N-NH3) in the rumen of steers at different collection times receiving different levels of COP or monensin sodium. Arrows indicate feeding time, vertical bars represent the standard deviation and asterisk (*) indicates treatment differences at that time (P ≤ 0.05).
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Table 1. Chemical composition of the concentrate supplement and Panicum maximum cv. Massai hay.
Table 1. Chemical composition of the concentrate supplement and Panicum maximum cv. Massai hay.
Variable Concentrate supplement 1 Hay
Component (g kg-1 from DM)
Dry matter 889.66 879.63
Organic Matter 928.33 922.57
Crude Protein 164.59 27.61
Neutral Detergent Fiber2 19.82 806.87
Ether Extract 24.89 12.77
Non-Fiber Carbohydrates 759.53 75.33
Ash 71.67 77.43
1 Composition of concentrated supplement (g kg-1): corn grain (850 g), soybean meal (75 g), urea (25 g) and minerals (50 g Guarantee levels of minerals (g or mg kg-1): Ca - max: 18 g, min - 12 g; P - max: 5 g; Na - min: 3.7 g; S - min: 1.5 g; Zn - min: 70.5 mg; F - max: 50 mg; Cu - min: 28 mg; Mn - min: 12 mg; I - min: 1.40 mg; Co - min: 0.94 mg; Se - min: 0.23 mg). 2 Neutral detergent fiber corrected for ash and protein content.
Table 2. Effect of different levels of copaiba oil (COP) or sodium monensin on intake of Massai hay (kg d-1 and g kg-1 of body weight (BW) and total diet (hay + concentrate).
Table 2. Effect of different levels of copaiba oil (COP) or sodium monensin on intake of Massai hay (kg d-1 and g kg-1 of body weight (BW) and total diet (hay + concentrate).
Intake2 Treatments1 SEM P-value
Control COP1.25 COP2.50 COP3.75 Monensin
kg d-1
Hay DM 4.20ª 4.21ª 3.97ª 4.02a 3.11b 0.226 0.0021
Total DM 8.37a 8.40ª 8.15ab 8.20ab 7.37b 0.306 0.0326
Hay CP 0.12a 0.12a 0.10ab 0.11ab 0.08b 0.009 0.0085
Total CP 0.80ª 0.81a 0.79a 0.79a 0.78a 0.019 0.6713
Hay apNDF 2.91ª 2.92a 2.72ª 2.80a 2.16b 0.159 0.0024
Total apNDF 3.70a 3.71a 3.52ª 3.60ª 2.97b 0.168 0.0045
Hay EE 0.06a 0.06a 0.05a 0.06a 0.04a 0.006 0.0423
Total EE 0.16a 0.16a 0.16a 0.16a 0.15a 0.007 0.6263
Hay NFC 0.79a 0.80a 0.80a 0.76ab 0.59b 0.056 0.0135
Total NFC 3.08a 3.10a 3.10a 3.06a 2.93a 0.201 0.6257
Hay OM 3.87ª 3.89ª 3.68ª 3.73ª 2.88b 0.016 0.0024
Total OM 7.74a 7.78ª 7.56ab 7.61ab 6.82b 0.285 0.0333
Hay DM 0.33ª 0.32ª 0.29ª 0.29ª 0.24b 0.016 0.0008
Total DM 0.63a 0.62ª 0.59ab 0.59ab 0.54b 0.451 0.0019
g kg-1 of BW
Hay DM 13.15a 13.15ª 12.14a 12.51a 9.43b 0.612 0.0003
Total DM 26.03a 26.19a 24.94a 25.41a 22.31b 0.566 0.0001
Hay CP 0.39a 0.37a 0.34ab 0.36ab 0.25b 0.038 0.0199
Total CP 2.51a 2.52a 2.44ab 2.49a 2.37b 0.027 0.0006
Hay apNDF 9.12a 9.11a 8.36a 8.73a 6.54b 0.447 0.0005
Total apNDF 11.55a 11.58a 10.78a 11.17a 8.97b 0.433 0.0003
Hay EE 0.17a 0.17a 0.16ab 0.17a 0.13b 0.011 0.0179
Total EE 0.49a 0.50a 0.48ab 0.48ab 0.45b 0.012 0.0187
Hay NFC 2.44a 2.50a 2.39a 2.32a 1.79b 0.139 0.0017
Total NFC 9.52a 9.67a 9.43a 9.41ab 8.87b 0.173 0.0061
Hay OM 12.13a 12.15a 11.25ª 11.58ª 8.71b 0.571 0.0003
Total OM 24.08ª 24.26ª 23.13ª 23.55ª 20.66b 0.529 0.0001
Hay DM 1.03ª 1.00ªb 0.89b 0.93ªb 0.72c 0.042 <0.0001
Total DM 1.95a 1.94ª 1.81b 1.86ab 1.65c 0.039 <0.0001
Averages followed by different lowercase letters in the rows differ from each other (P ≤ 0.05). SEM: standard error of the mean. 1 Treatments: Control - without additives, COP1.25, COP2.50, COP3.75 – with the addition of 1.25; 2.50 and 3.75 g kg-1 of copaiba oil DM, respectively, monensin – with the addition of 40 mg kg-1 of sodium monensin DM. 2 DM: dry matter; CP: crude protein; apNDF: neutral detergent fiber corrected for ash and protein content; EE: ether extract; NFC: non-fiber carbohydrates; OM: organic matter.
Table 3. Effect of the supply of different levels of copaiba oil or monensin on apparent digestibility coefficients (g kg-1).
Table 3. Effect of the supply of different levels of copaiba oil or monensin on apparent digestibility coefficients (g kg-1).
Digestibility2 Treatments1 SEM P-value
Control COP1.25 COP2.50 COP3.75 Monensin
DM (fraction 0-1) 0.60 0.59 0.60 0.59 0.62 0.016 0.4977
Digestible fraction (g kg-1 DM)
OM 625.08 622.55 620.31 615.47 638.83 16,024 0.6691
CP 687.85 678.70 676.00 686.61 703.57 16,025 0.4848
apNDF 502.77 495.61 499.55 478.02 492.17 24,925 0.8746
EE 750.47 756.1 768.49 795.85 810.21 25,283 0.1456
NFC 741.76 749.34 737.08 748.48 759.16 31.513 0.9633
Means followed by different lowercase letters in the rows differ from each other (P ≤ 0.05). SEM: standard error of the mean. 1 Treatments: Control - without additives, COP1.25 – with the addition of 1.25 g kg-1 of copaiba oil DM, COP2.50 – with the addition of 2.50 g kg-1 of copaiba oil DM, COP3.75 – with the addition of 3.75 g kg-1 of copaiba oil DM, monensin – with the addition of 40 mg kg-1 of sodium monensin DM. 2 DM: dry matter; CP: crude protein; apNDF: neutral detergent fiber corrected for ash and protein content; EE: ether extract; NFC: non-fiber carbohydrates; OM: organic matter.
Table 4. Effect of the supply of different levels of copaiba oil or sodium monensin on the DM and NDF degradation parameters of Massai hay.
Table 4. Effect of the supply of different levels of copaiba oil or sodium monensin on the DM and NDF degradation parameters of Massai hay.
Degradation
Parameters 2 		Treatments 1 SEM P-value
Control COP1.25 COP2.50 COP3.75 Monensin
DM (a = 23.16)
b 44.64ab 46.97a 44.26ab 43.84b 39.46c 0.963 <0.0001
c 0.035a 0.030ab 0.034ab 0.033ab 0.025b 0.003 0.0221
ED3 51.02a 48.81a 50.03a 49.47a 43.82b 1.354 0.0016
NDF
b 64.41a 66.90a 63.54a 63.61a 58.93b 1.243 0.0006
c 0.034 0.030 0.033 0.032 0.027 0.003 0.2048
ED 26.02a 24.33ab 25.29a 24.67ab 20.15b 1.654 0.0223
Means followed by different lowercase letters in the rows differ from each other (P ≤ 0.05). SEM: standard error of the mean. 1 Treatments: Control - without additives, COP1.25, COP2.50, and COP3.75 – with the addition of 1.25, 2.50, and 3.75 g kg-1 of copaiba oil DM, respectively, monensin – with the addition of 40 mg kg-1 of sodium monensin DM. 2 Degradation parameters: “a”: soluble hay fraction (g 100 g-1); “b”: potentially degradable insoluble fraction (g 100 g-1); “c”: degradation rate (h-1); “ED”: effective degradation (g 100 g-1). 3 R uminal solids passage rate: 0.05 h-1.
Table 5. Effect of the supply of different levels of copaiba oil or sodium monensin on rumen volatile fatty acid (VFA) production.
Table 5. Effect of the supply of different levels of copaiba oil or sodium monensin on rumen volatile fatty acid (VFA) production.
Item Treatments1 SEM P-value
Control COP1.25 COP2.50 COP3.75 Monensin Treat. h Treat. *h
Volatile fatty acids (mmol L-1)
Acetate 82.18 82.69 78.37 78.74 78.95 3.114 0.6435 <0.0001 0.0056
Propionate 17.40b 16.78b 14.07b 16.84b 31.49a 1.346 <0.0001 <0.0001 <0.0001
Butyrate 12.52 13.03 11.57 12.33 9.62 1.247 0.1632 <0.0001 0.1594
Total VFA’s 111.67 112.56 105.86 108.85 119.61 4.688 0.3088 <0.0001 0.0002
Ratio
acetate: propionate		 4.98a 5.25a 5.26a 4.61a 2.61b 0.357 <0.0001 <0.0001 0.2498
Volatile fatty acids (mmol 100 mmol-1)
Acetate 73.65a 74.03 a 74.24 a 72.73 a 66.07 b 0.468 <0.0001 <0.0001 0.1964
Propionate 14.97b 14.78b 13.34b 15.92b 26.33a 0.994 <0.0001 <0.0001 0.0932
Butyrate 11.06a 11.56a 10.86a 11.21a 8.01b 0.870 0.0090 0.0001 0.1256
Means followed by different lowercase letters in the rows differ from each other (P < 0.05). SEM: standard error of the mean 1Treatments: Control - without additives, COP1.25, COP2.50, and COP3.75 – with the addition of 1.25, 2.50, and 3.75 g kg-1 of copaiba oil DM, respectively, monensin – with the addition of 40 mg kg-1 of sodium monensin DM.
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