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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.

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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.

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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.