Genetic and phenotypic trends in Polish large white nucleus swine herds.
نویسندگان
چکیده
منابع مشابه
Population parameter estimates for performance and reproductive traits in Polish Large White nucleus herds.
Performance test records from on-farm tests of young Polish Large White boars and reproductive records of Polish Large White sows from 94 nucleus farms during 1978 to 1987 were used to estimate population parameters for the measured traits. The number of boar performance records after editing was 114,347 from 3,932 sires, 21,543 dams, 44,493 litters and 1,075 herd-year-seasons. Reproductive per...
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Records collected during 1971 through 1979 from 101,606 pigs raised in 18 herds that were members of the Nebraska SPF Swine Accrediting Association were evaluated for phenotypic trends and predicted and observed genetic trends. Traits considered were backfat at 100 kg (BF) and weight at 140 d of age (WT). Phenotypic change on average was beneficial for BF (-.05 mm/yr) but undesirable for WT (-....
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1991
ISSN: 0021-8812
DOI: 10.2527/1991.692551x