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Heritability and Correlation Estimates for Serum Insulin-Like Growth Factor I Concentration, Weight, Weight Gain, and Height in Angus Beef Cattle in a Long-Term Divergent Selection Study for Serum Insulin-Like Growth Factor I (1989 to 2017)
Version 1
: Received: 29 October 2024 / Approved: 30 October 2024 / Online: 30 October 2024 (14:02:09 CET)
How to cite:
Davis, M. E.; Simmen, R. C. M. Heritability and Correlation Estimates for Serum Insulin-Like Growth Factor I Concentration, Weight, Weight Gain, and Height in Angus Beef Cattle in a Long-Term Divergent Selection Study for Serum Insulin-Like Growth Factor I (1989 to 2017). Preprints2024, 2024102433. https://doi.org/10.20944/preprints202410.2433.v1
Davis, M. E.; Simmen, R. C. M. Heritability and Correlation Estimates for Serum Insulin-Like Growth Factor I Concentration, Weight, Weight Gain, and Height in Angus Beef Cattle in a Long-Term Divergent Selection Study for Serum Insulin-Like Growth Factor I (1989 to 2017). Preprints 2024, 2024102433. https://doi.org/10.20944/preprints202410.2433.v1
Davis, M. E.; Simmen, R. C. M. Heritability and Correlation Estimates for Serum Insulin-Like Growth Factor I Concentration, Weight, Weight Gain, and Height in Angus Beef Cattle in a Long-Term Divergent Selection Study for Serum Insulin-Like Growth Factor I (1989 to 2017). Preprints2024, 2024102433. https://doi.org/10.20944/preprints202410.2433.v1
APA Style
Davis, M. E., & Simmen, R. C. M. (2024). Heritability and Correlation Estimates for Serum Insulin-Like Growth Factor I Concentration, Weight, Weight Gain, and Height in Angus Beef Cattle in a Long-Term Divergent Selection Study for Serum Insulin-Like Growth Factor I (1989 to 2017). Preprints. https://doi.org/10.20944/preprints202410.2433.v1
Chicago/Turabian Style
Davis, M. E. and Rosalia C. M. Simmen. 2024 "Heritability and Correlation Estimates for Serum Insulin-Like Growth Factor I Concentration, Weight, Weight Gain, and Height in Angus Beef Cattle in a Long-Term Divergent Selection Study for Serum Insulin-Like Growth Factor I (1989 to 2017)" Preprints. https://doi.org/10.20944/preprints202410.2433.v1
Abstract
This study investigated the genetic parameters for serum IGF-I concentrations and growth traits in beef cattle. A divergent selection experiment for serum IGF-I concentration was initiated in 1989. One hundred spring-calving (50 high line and 50 low line) and 100 fall-calving (50 high line and 50 low line) Angus cows with unknown IGF-I concentrations were randomly assigned to the two divergent selection lines. For the 2009 through 2017 breeding seasons, the selection criterion in the two lines was changed from serum IGF-I concentration to high vs. low maintenance energy expected progeny differences (ME EPD). The number of records available for analysis varied from 2,056 for IGF-I concentration on day 42 of the postweaning performance test to 2,988 for birth weight, with the exception that only 617 records were available for IGF-I concentration at weaning. (Co)variance components were estimated for direct and maternal additive genetic effects using an animal model and multiple-trait, derivative-free, restricted maximum likelihood (MTDFREML) computer programs. Direct heritability estimates for serum IGF-I concentrations ranged from 0.34 ± 0.07 to 0.46 ± 0.07, whereas direct heritability estimates for weight traits ranged from 0.32 ± 0.05 to 0.39 ± 0.07. Maternal genetic effects on IGF-I were minimal, with estimates ranging from 0.02 ± 0.11 to 0.17 ± 0.05, and were similarly low for weight traits. Maternal permanent environmental effects were negligible for IGF-I but were larger for weight traits, especially for weaning weight (0.22 ± 0.04). Direct-maternal correlations for postweaning IGF-I concentrations were approximately -0.90. Genetic correlations of IGF-I concentration at weaning with postweaning IGF-I measures ranged from 0.63 to 0.90. Genetic correlations among IGF-I measures at the postweaning time points were also large (≥ 0.89). The genetic correlations of IGF-I with weight traits were generally low, with negative correlations observed for birth weight and small positive correlations for the other weight traits. Environmental and phenotypic correlations between IGF-I concentrations and growth traits were generally low, indicating that shared environmental influences are minimal and that circulating IGF-I has a modest impact on growth traits in beef cattle.
Biology and Life Sciences, Animal Science, Veterinary Science and Zoology
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