Genetic relationships of calving difficulty with birth measurements and carcass traits in Japanese Black cattle.

The objectives of this study were to compare the genetic parameters for calving difficulty (CD), which were treated as both a calf trait (CD_calf) and as a dam trait (CD_dam), and to clarify genetic relationships of these CDs with body size traits of calves at birth and carcass traits. In total, the CD records and calf body measurements of 2,258 Japanese Black cattle heifers were used in this study, in addition to the carcass records of 4,300 feedlot steers and heifers. Direct heritability of CD_calf (0.44) was higher than maternal heritability of CD_calf (0.30), as well as CD_dam heritability (0.25). Direct genetic correlations between CD_calf and calf body size were moderate to strongly positive (0.64 to 0.81). The correlations between EBVs of CDs and carcass weight were also positive (0.30 to 0.64). These positive relationships showed that genetically improving CD (reducing dystocia) could produce smaller calves and carcasses. In contrast, the correlations between CDs and beef marbling score were weak, suggesting that improving CD would not influence meat quality traits. Fitting an animal model to CD_calf could be more preferred to fitting the model to CD_dam, because the former could separate the genetic effects of dams and calves.

[1]  M. Veronesi,et al.  Prevalence, causes, resolution and consequences of bovine dystocia in Italy. , 2018, Theriogenology.

[2]  G. Rosa,et al.  Relationship between calving difficulty and fertility traits in first-parity Iranian Holsteins under standard and recursive models. , 2016, Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie.

[3]  J. Jamrozik,et al.  Genetic evaluation of calving ease in Canadian Simmentals using birth weight and gestation length as correlated traits , 2014 .

[4]  K. Weigel,et al.  Exploring Biological Relationships Between Calving Traits in Primiparous Cattle with a Bayesian Recursive Model , 2009, Genetics.

[5]  H. Hirooka,et al.  Genetic parameters for gestation length and the relationship with birth weight and carcass traits in Japanese Black cattle , 2008 .

[6]  I. Misztal,et al.  THRGIBBS1F90 for estimation of variance components with threshold and linear models. , 2006 .

[7]  M. Lund,et al.  Gestation length in Danish Holsteins has weak genetic associations with stillbirth, calving difficulty, and calf size , 2004 .

[8]  S. Eriksson,et al.  Genetic parameters for calving difficulty, stillbirth, and birth weight for Hereford and Charolais at first and later parities. , 2004, Journal of animal science.

[9]  D. Laloë,et al.  Evaluation models and genetic parameters for calving difficulty in beef cattle. , 2003, Journal of animal science.

[10]  R. Tempelman,et al.  Bayesian inference strategies for the prediction of genetic merit using threshold models with an application to calving ease scores in Italian Piemontese cattle , 2002 .

[11]  I Misztal,et al.  Threshold-linear versus linear-linear analysis of birth weight and calving ease using an animal model: II. Comparison of models. , 1999, Journal of animal science.

[12]  J. Wilton,et al.  GENETIC PARAMETERS FOR MATERNAL TRAITS IN BEEF CATTLE , 1988 .

[13]  R. M. Koch,et al.  Genetic correlations among sex-limited traits in beef cattle. , 1984, Journal of animal science.

[14]  P. Berger,et al.  A Bayesian threshold-linear model evaluation of perinatal mortality, dystocia, birth weight, and gestation length in a Holstein herd. , 2011, Journal of dairy science.

[15]  A. Unalan.  ESTIMATION OF GENETIC PARAMETERS AND CORRELATIONS AMONG SOME BODY MEASUREMENTS OF HOLSTEIN CALVES AND EFFECTS OF THESE MEASUREMENTS ON CALVING DIFFICULTY , 2009 .