Genetic and Phenotypic Parameters Estimated From Nebraska Specific-Pathogen-Free Swine Field Records
نویسندگان
چکیده
منابع مشابه
Genetic and phenotypic parameters estimated from Nebraska specific-pathogen-free swine field records.
Records collected during 1971 through 1979 from 101,606 hogs raised in 18 Nebraska Specific Pathogen Free herds were analyzed. Traits considered were backfat at 100 kg (BF), weight at 140 d of age (WT) and, in some analyses, number of live pigs/litter at birth (NBA). The phenotypic correlation of BF and WT, averaged across herds, was -.07. The correlations between BF and NBA and between WT and ...
متن کاملSelection practices and genetic and phenotypic trends estimated from Nebraska SPF swine field records.
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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Field records from 14,380 Japanese Brown steers by 92 sires were used to estimate genetic parameters for growth and carcass traits. Multipletrait restricted maximum likelihood (REML) procedures accounting for relationships among sires were used in estimating (co)variance components among average daily gain during fattening periods (ADG), carcass weight (CWT), longissimus muscle area (LMA), rib ...
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This study aimed to compare growth indices and production of rainbow trout breeders (Oncorhynchus mykiss) without any specific pathogens in various populations at the Fishery Research Center of Coldwater-Tonekabon. The project's implementation included collecting Pre-breeders were done in selected rainbow trout breeding centers (based on the approval of the Iranian Fisheries Organization and th...
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Cover Art Caption: Odor emission from swine facilities is a major issue for the pork industry. Here, air samples are taken to determine the impact of reducing dietary crude protein concentration through the use of crystalline amino acids on odor emission into building air. The effects of type of housing (stalls versus pens) and method of heat detection (fence-line boar exposure conducted in-pla...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1983
ISSN: 0021-8812,1525-3163
DOI: 10.2527/jas1983.5751117x