Estimation of dominance variance in purebred Yorkshire swine.
نویسندگان
چکیده
منابع مشابه
Estimation of dominance variance in purebred Yorkshire swine.
We used 179,485 Yorkshire reproductive and 239,354 Yorkshire growth records to estimate additive and dominance variances by Method Fraktur R. Estimates were obtained for number born alive (NBA), 21-d litter weight (LWT), days to 104.5 kg (DAYS), and backfat at 104.5 kg (BF). The single-trait models for NBA and LWT included the fixed effects of contemporary group and regression on inbreeding per...
متن کاملEstimation of direct and maternal genetic variance for litter size in Canadian Yorkshire and Landrace swine using an animal model.
Estimates of additive direct heritability (h2a) for traits such as litter size may be biased by maternal effects. The size of these effects was estimated using a derivative-free restricted maximum likelihood procedure under an animal model. First-parity records from Yorkshire (Y) and Landrace (L) gilts were obtained from the Quebec Record of Performance sow productivity program for 21,127 litte...
متن کاملVariance components estimation for farrowing traits of three purebred pigs in Korea
OBJECTIVE This study was conducted to estimate breed-specific variance components for total number born (TNB), number born alive (NBA) and mortality rate from birth through weaning including stillbirths (MORT) of three main swine breeds in Korea. In addition, the importance of including maternal genetic and service sire effects in estimation models was evaluated. METHODS Records of farrowing ...
متن کاملInfluence of dominance relationships on the estimation of dominance variance with sire-dam subclass effects.
Two data sets from the USDA Livestock and Range Research Laboratory were analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 weaning weight) records of inbred USDA Line 1 Herefords. The second consisted of 8,065 birth weight (7,380 weaning weight) records from a line-cross experiment with five lines. Two models were...
متن کاملInfluence of Dominance Relationships on the Estimation of Dominance Variance with Sire-Dam Subclass Effects1
Two data sets from the USDA Livestock and Range Research Laboratory were analyzed to study dominance variance and the influence of dominance relationships. The first consisted of 4,155 birth weight (3,884 weaning weight) records of inbred USDA Line 1 Herefords. The second consisted of 8,065 birth weight (7,380 weaning weight) records from a line-cross experiment with five lines. Two models were...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1998
ISSN: 0021-8812
DOI: 10.2527/1998.762448x