Comparison of Sire Evaluation by Field Records with Station Progeny Test
نویسندگان
چکیده
منابع مشابه
Sire Evaluation by Only Extended Partial Milk and Fat Records
The standard of comparison for dairy production records is the 305-day lactation, and much research has been directed to estimating 305-day milk and fat records from incomplete or in-progress records. This study was to determine the effect of several methods of extending incomplete records on sire evaluation. Complete 305-day milk and fat records of first lactations of 73,724 daughters of 1,362...
متن کاملComparison of Three Methods of Sire Evaluation
Three methods of sire evaluation were compared empirically--herdmate comparison, least squares, and maximum likelihood. Michigan Dairy Herd Improvement Association Holstein data representing 10,620 first lactation records and 1,003 herd-year groups were analyzed. Forty individual bulls representing three artificial insemination units were evaluated. The rank correlations among herdmate comparis...
متن کاملComparison of sire breed solutions for growth traits adjusted by mean expected progeny differences to a 1993 base.
Records on growth traits were obtained from five Midwestern agricultural experiment stations as part of a beef cattle crossbreeding project (NC-196). Records on birth weight (BWT, n =3,490), weaning weight (WWT, n = 3,237), and yearling weight (YWT, n = 1,372) were analyzed within locations and pooled across locations to obtain estimates of breed of sire differences. Solutions for breed of sire...
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ژورنال
عنوان ژورنال: Nihon Chikusan Gakkaiho
سال: 1989
ISSN: 1346-907X,1880-8255
DOI: 10.2508/chikusan.60.1057