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Phenotypic relationships between docility and reproduction in Angus heifers
Journal of Animal Science
|April 12, 2016
Summary
Docility traits, including chute score and exit velocity, influence first-service AI conception rates in heifers. While not significant across all herds, these docility measures, along with body weight, predicted pregnancy in one herd, suggesting docility warrants further study.
Area of Science:
- Animal Science
- Reproductive Biology
- Behavioral Science
Background:
- First-service artificial insemination (AI) conception rate is a critical economic trait in beef cattle production.
- Docility, a measure of animal temperament, is increasingly recognized as a factor influencing cattle welfare and productivity.
- Understanding the relationship between docility and reproductive success is essential for improving herd management and genetic selection.
Purpose of the Study:
- To investigate the phenotypic associations between various measures of docility and the conception rate of heifers at first service using AI.
- To identify specific docility indicators that may predict or influence successful pregnancy in beef heifers.
Main Methods:
- Data from 337 heifers across three Kansas herds were collected, including exit velocity (EV), chute score (CS), fecal cortisol (FC), and blood serum cortisol (BC).
- Logistic regression analysis was employed to determine the relationship between docility indicators (FC, BC, EV, CS) and body weight (BW) and age as covariates, with 30-day pregnancy rate as the dependent variable.
- Correlation coefficients were calculated to assess relationships between all continuous traits.
Main Results:
- No significant predictors of 30-day pregnancy were identified when data from all ranches were combined.
- However, for one specific ranch, chute score (CS) and body weight (BW) were significant predictors of 30-day pregnancy.
- Increased chute score (1-unit increase) reduced pregnancy probability by 48.1%, and increased body weight (1-kg increase) decreased pregnancy probability by 2.2% in that herd.
Conclusions:
- Docility, particularly chute score and body weight, may play a role in first-service AI conception rates in heifers, although this relationship can be herd-specific.
- While overall results were not significant, the findings suggest that docility is a complex trait that merits further investigation in relation to reproductive efficiency.
- These results highlight the need for herd-specific analyses when evaluating the impact of temperament on fertility in cattle.
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