%0 Journal Article %1 Johanson2011450 %A Johanson, J.M. %A Berger, P.J. %A Tsuruta, S. %A Misztal, I. %D 2011 %J Journal of Dairy Science %K 2011 dairy_cattle %N 1 %P 450 - 460 %R http://dx.doi.org/10.3168/jds.2009-2992 %T A Bayesian threshold-linear model evaluation of perinatal mortality, dystocia, birth weight, and gestation length in a Holstein herd %U http://www.sciencedirect.com/science/article/pii/S0022030210007137 %V 94 %X The objective of this research was to estimate genetic parameters for a multiple-trait evaluation of dystocia (DYS), perinatal mortality (PM), birth weight (BWT), and gestation length (GL) in Holsteins. The data included 5,712 calving records collected between 1968 and 2005 from the Iowa State University dairy breeding herd in Ankeny. The incidence of \PM\ was 8.8% and that of \DYS\ 28.8%; mean \BWT\ was 40.5 kg, and \GL\ was 279 d. A threshold-linear animal model included the effects of year, season, sex of calf, parity, sire group, direct genetic, maternal genetic, and maternal permanent environment. Direct heritabilities for DYS, PM, BWT, and \GL\ were 0.11 (0.04), 0.13 (0.05), 0.26 (0.04), and 0.51 (0.05), respectively. Maternal heritabilities were 0.14 (0.04), 0.15 (0.03), 0.08 (0.01), and 0.08 (0.02), for DYS, PM, BWT, and GL, respectively. The heritabilities are the posterior means of the Gibbs samples with their standard deviations in parentheses. The direct genetic correlation between \PM\ and \DYS\ was estimated at 0.67 (0.19), whereas the maternal genetic correlation was 0.45 (0.16). Direct and maternal \PM\ and \DYS\ are partially controlled by the same genes. Selection on only calving ease is not sufficient to control PM. With moderate genetic correlations between all 4 traits, \BWT\ and \GL\ should be included with \DYS\ and \PM\ in an evaluation of calving performance.

@article{Johanson2011450, abstract = {The objective of this research was to estimate genetic parameters for a multiple-trait evaluation of dystocia (DYS), perinatal mortality (PM), birth weight (BWT), and gestation length (GL) in Holsteins. The data included 5,712 calving records collected between 1968 and 2005 from the Iowa State University dairy breeding herd in Ankeny. The incidence of \{PM\} was 8.8% and that of \{DYS\} 28.8%; mean \{BWT\} was 40.5 kg, and \{GL\} was 279 d. A threshold-linear animal model included the effects of year, season, sex of calf, parity, sire group, direct genetic, maternal genetic, and maternal permanent environment. Direct heritabilities for DYS, PM, BWT, and \{GL\} were 0.11 (0.04), 0.13 (0.05), 0.26 (0.04), and 0.51 (0.05), respectively. Maternal heritabilities were 0.14 (0.04), 0.15 (0.03), 0.08 (0.01), and 0.08 (0.02), for DYS, PM, BWT, and GL, respectively. The heritabilities are the posterior means of the Gibbs samples with their standard deviations in parentheses. The direct genetic correlation between \{PM\} and \{DYS\} was estimated at 0.67 (0.19), whereas the maternal genetic correlation was 0.45 (0.16). Direct and maternal \{PM\} and \{DYS\} are partially controlled by the same genes. Selection on only calving ease is not sufficient to control PM. With moderate genetic correlations between all 4 traits, \{BWT\} and \{GL\} should be included with \{DYS\} and \{PM\} in an evaluation of calving performance. }, added-at = {2016-05-15T21:11:58.000+0200}, author = {Johanson, J.M. and Berger, P.J. and Tsuruta, S. and Misztal, I.}, biburl = {https://www.bibsonomy.org/bibtex/252dad0a5c0ee5fcd535a51bedae28a19/uga.abgg}, doi = {http://dx.doi.org/10.3168/jds.2009-2992}, interhash = {7819883e2addb57cbbd8024836182222}, intrahash = {52dad0a5c0ee5fcd535a51bedae28a19}, issn = {0022-0302}, journal = {Journal of Dairy Science }, keywords = {2011 dairy_cattle}, number = 1, pages = {450 - 460}, timestamp = {2016-05-15T21:11:58.000+0200}, title = {A Bayesian threshold-linear model evaluation of perinatal mortality, dystocia, birth weight, and gestation length in a Holstein herd}, url = {http://www.sciencedirect.com/science/article/pii/S0022030210007137}, volume = 94, year = 2011 }