Bias in Sire Evaluation Due to Selection
Open Access
- 1 September 1963
- journal article
- research article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 46 (9) , 976-982
- https://doi.org/10.3168/jds.s0022-0302(63)89189-4
Abstract
The 1st and 2nd lactation records of New York artificially sired Holstein cows were analyzed to determine the effect of culling after the 1st lactation on sire evaluation based on both 1st and 2nd lactation records. Results indicated that weighting 1st and 2nd records according to number of records per cow, repeatability, and heritability evaluated sires almost identically with the method which uses the average of a daughter''s 1st and 2nd records. Even with a pronounced differential culling rate after the 1st lactation, there was no evidence of a differential bias in evaluating sires of different genetic merit based on 1st and 2nd lactation records.This publication has 4 references indexed in Scilit:
- Actual and Expected Accuracy of Sire Proofs under the New York System of Sampling BullsZeitschrift für Tierzüchtung und Züchtungsbiologie, 1961
- Factors Influencing Dairy Cattle LongevityJournal of Dairy Science, 1960
- The effect of selection for heifer milk yield on the production level of mature cowsThe Journal of Agricultural Science, 1958
- Components of the Relationship Between Level of Production and Rate of Maturity in Dairy CattleJournal of Dairy Science, 1955