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Adjusting weight for body condition score in Angus cows.
S L Northcutt1, D E Wilson, R L Willham
1Department of Animal Science, Iowa State University, Ames 50011.
Journal of Animal Science
|May 1, 1992
Summary
Body condition score significantly impacts Angus cow weight, accounting for 16% of variation. This study provides adjustment factors to standardize weights across different body condition scores for better genetic evaluation.
Area of Science:
- Animal Science
- Beef Cattle Production
- Quantitative Genetics
Background:
- Accurate body weight is crucial for beef cattle genetic evaluations.
- Body condition score (BCS) is a subjective measure of an animal's energy reserves.
- Understanding the relationship between BCS and weight is essential for accurate data standardization.
Purpose of the Study:
- To determine the effect of body condition score on Angus cow weight.
- To compute condition score adjustment factors for cow weight.
- To improve the accuracy of genetic evaluations by accounting for BCS variations.
Main Methods:
- Utilized weight, height, and BCS data from 11,301 Angus cows.
- Employed a mathematical model including fixed effects of herd, year-month, cow age, and BCS.
- Analyzed BCS scores from 2 to 8 on a 9-point scale.
Main Results:
- BCS significantly affected cow weight (P < .0001), explaining 16% of total variation.
- Established weight adjustment factors for BCS scores 2 through 8.
- Herd, year-month, and cow age were also highly significant factors for weight and height.
Conclusions:
- Body condition score is a critical factor influencing Angus cow weight.
- The derived adjustment factors can standardize weight records for improved genetic analysis.
- Standardizing weight data based on BCS enhances the reliability of beef cattle breeding values.