Estimation of genetic parameters for female fertility traits in the Czech Holstein population M. Brzáková1, P. Pešek1, L. Zavadilová, J. Přibyl1 & A. Kranjčevičová1 1Institute of Animal Science, Přátelství 815, 10400 Prague – Uhříněves, Czech Republic brzakova.michaela@vuzv.cz (Corresponding Author) Female fertility is one of the major factors that affects the profitability of milk production in dairy cattle. Poor fertility parameters increase the cost of milk production through a higher culling rate, cost of fertility treatments, and number of inseminations, and longer calving intervals. Therefore, it is necessary to incorporate fertility into selection programs to slow the deterioration or to improve fertility in dairy cattle. The aim of this study was to estimate the genetic parameters for selected cow fertility traits in the Czech Holstein population as a step toward the incorporation of novel fertility traits into routine genetic evaluations. As an indicators of female fertility were chosen days open and calving interval. Data were obtained from the Czech Moravian Breeding Corporation and only data collected since 2005 were included in the study. Effects which should be included in the model for genetic parameter estimation were identifying using the General Linear Model (GLM) procedure of SAS 9.4. Significant effects (p < 0.05) were included. The Bayesian approach in the DMU RJMC (Madsen and Jensen, 2013) module was used to estimate the variance components. A single trait animal model included the fixed effect of herd-year-season of birth, herd-year-month of calving, the fixed effect of lactation number, the fixed effect of the last calving ease, the regression at the age at first insemination in heifers with respect to the age at first calving in cows, the random animal effect, the random permanent environmental effect and the random residual effect. Average days open was 124.26 days abd average calving interval was 400.08 days. The heritability estimate was 0.038 for days open and 0.034 for calving interval. Variances of random permanent effects were higher than those of additive genetic effects in these traits in mature cows. Repeatability (w2) was 0.087 and 0.090 for days open and calving interval, respectively. The research was supported by the Ministry of Agriculture of the Czech Republic (MZeRO 0717) and the National Agency for Agricultural Research of the Czech Republic (QJ1510144). Keywords: dairy cattle, breeding value, days open, calving interval

Michaela Brzáková, Petr Pešek, Ludmila Zavadilová, Josef Přibyl, Anita Kranjčevičová

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Biology & Species - Bovine (dairy) 1, , 218, 2018
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