Prediction of Heifer Transmitting Ability from Genetic Evaluations of Sire, Dam, and Maternal Grandsire
نویسندگان
چکیده
منابع مشابه
Prediction of heifer transmitting ability from genetic evaluations of sire, dam, and maternal grandsire.
Estimated transmitting abilities for milk of 258,201 Holstein heifers from first lactations were regressed on sire's milk proof, maternal grandsire's milk proof, and either dam's estimated transmitting ability from milk in first lactation or dams's estimated transmitting ability from milk of all lactations. Effects of year of birth of dam, dam's estimated transmitting ability for milk from firs...
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Simultaneous genetic evaluations for bulls and cows obtained by mixed model procedures with an animal model incorporating all numerator relationships for artificially sired Holstein cows in northeastern United States were compared with separate (Northeast) mixed model evaluations of cows and sires for predicting genetic evaluations of progeny from dam, sire, and maternal grandsire evaluations. ...
متن کاملComparison of dams' estimated transmitting abilities from first lactation herdmates or all records of herdmates to predict sons' milk evaluations.
Multiple regression of genetic evaluations for milk yields of first lactations of 159 Holstein bulls on sire, dam, and maternal grandsire evaluations indicates that the weight for estimated transmitting ability of the dam calculated from the first record of the dam and first records of her herdmates is about as theoretically expected and is markedly superior both to estimated transmitting abili...
متن کاملGenetic evaluation of stillbirth in United States Holsteins using a sire-maternal grandsire threshold model.
A sire-maternal grandsire threshold model was used for genetic evaluation of stillbirth in US Holsteins. Calving ease and stillbirth records for herds reporting at least 10 dead calves were extracted from the Animal Improvement Programs Laboratory database. About half of the 14 million calving ease records in the database had a known livability score, mostly from herds processed by Dairy Record...
متن کاملGenetic parameters of calving ease using sire-maternal grandsire model in Korean Holsteins
OBJECTIVE Calving ease (CE) is a complex reproductive trait of economic importance in dairy cattle. This study was aimed to investigate the genetic merits of CE for Holsteins in Korea. METHODS A total of 297,614 field records of CE, from 2000 to 2015, from first parity Holstein heifers were recorded initially. After necessary data pruning such as age at first calving (18 to 42 mo), gestation ...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1985
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(85)80980-2