Sire Evaluation from Five-Month Daughter Records
نویسندگان
چکیده
منابع مشابه
Prediction of Average Daughter Performance from Sire Proofs for Use in Linear Programming Sire Profit Models
When linear programming is used to rank sires on daughter profits, coefficients of input are required for representative daughters of each sire. Within herdyear-season regressions of daughter's actual 305-day milk, fat percent, days open, 2-min milk yield adjusted for total yield, total milking time, and body weight at birth and first calving on sire's proofs for production, conformation, milki...
متن کاملSire 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 کاملFive Measures of a Sire
SUMMARY Lactation milk and fat records of 6,949 daughters, 6,201 different dams, and the contemporary D.H.I.A. herd averages of 2,420 herds were studied, to compare five measures of a dairy site's transmitting ability. They were the daughter average, daughter-dam difference, equal-parent index, daughter-contemporary herd difference, and daughter-contemporary-herd index. The daughters and dams w...
متن کاملPreliminary Report on International Dairy Sire Evaluation Using Individual Performance Records
International genetic evaluation of dairy sires is currently a two-stage process. Sire EBV are first calculated at the national level based on data of local progeny, then these national EBV are combined into international EBV at the Interbull Centre. However, differences in within-country procedures for data collection and genetic evaluation can affect the results, and traits or production envi...
متن کاملSire Evaluation for Milking Duration
ACKNOWLEDGMENTS This project would not have been possible without the help of several individuals within the dairy industry. My advisor, Dr. Stan Henderson, provided the opportunity to research this project. Dr. Henderson guided me throughout the project and assisted in obtaining these data. Dr. Henderson also assisted in compiling these data and developing the manuscript. Without the help of D...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1962
ISSN: 0021-8812,1525-3163
DOI: 10.2527/jas1962.213633x