title: Estimation of genetic parameters for carcass defects of Japanese Black cattle in Kagoshima.
abstract: Cattle exhibit a range of carcass defects, including blood splash (BLS), intramuscular edema (INE), muscle steatosis (MUS), bruising (BR), trim loss (TRL) and others (OTH). These defects lower the carcass value and can result in significant economic loss to producers. We estimated the incidence, relationship with inbreeding coefficients and genetic parameters of carcass defects in Japanese Black cattle using 561 619 carcass records from Kagoshima, Japan during April 1988 through March 2011. The defect incidence ranged from 0.22% for TRL to 5.73% for BR. The incidence of MUS and BR increased from 1.21% to 6.57% and from 1.06% to 9.31%, respectively. The incidence of INE peaked at 7.44% in 1999 and decreased thereafter. We observed a positive linear relationship between the defect incidence and the inbreeding coefficients in MUS, BR and TRL (P < 0.01). The heritabilities estimated by univariate animal model with Gibbs sampling for BLS, INE, MUS, BR and TRL were 0.24, 0.06, 0.18, 0.05 and 0.02, respectively. The contribution of farm variance to phenotypic variance was negligible (0.01 to 0.04). Significant genetic correlations of TRL were estimated with MUS (0.63) and BR (0.63). Our results suggest that genetic factors contribute to the incidence of BLS and MUS.
authors.affiliation: Graduate School of Agriculture.|Wagyu Registry Association, Kagoshima.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Nishi
authors.affiliation: Faculty of Agriculture.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Shimogiri
authors.affiliation: Kagoshima Branch, Wagyu Registry Association.
authors.forename: Akinori
authors.initials: A
authors.lastname: Kusano
authors.affiliation: Kagoshima Branch, Wagyu Registry Association.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Sakamoto
authors.affiliation: Kagoshima Prefectural Economic Foundation of Agricultural Cooperatives.
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Shiromoto
authors.affiliation: Natural Science Center for Research and Education, Kagoshima University.
authors.forename: Kotaro
authors.initials: K
authors.lastname: Kawabe
authors.affiliation: Faculty of Agriculture.
authors.forename: Shin
authors.initials: S
authors.lastname: Okamoto
authors.affiliation: Food Resources Education and Research Center, Graduate School of Agricultural Science, Kobe University, Kasai, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Honda
authors.affiliation: Food Resources Education and Research Center, Graduate School of Agricultural Science, Kobe University, Kasai, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Oyama
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002417:Cattle / Q000235:genetics*; D063427:Food Quality; D007178:Inbreeding; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008460:Meat / Q000191:economics* / Q000706:statistics & numerical data*; D010641:Phenotype
keywords: Gibbs sampling; Japanese Black cattle; Kagoshima; carcass defect; genetic parameter