Estimation of Genetic Parameters for Some Reproductive Disorders and Its Relationship with Production Traits in Iranian Holstein Cows

In this study, estimation of genetic parameters were performed for some reproductive disorders (retained placenta, repetitious abortion and infertility) and genetic and phenotypic correlations between these traits with milk, fat and protein yield. The obtained data were collected from 63403 Holstein cows on Animal Breeding Center of Iran (from 2001 to 2013). After editing the data, estimation of genetic parameters for traits was performed by univariate animal and Threshold models. Estimates of genetic and phenotypic correlations among mentioned traits and production traits were performed by bivariate animal model via using the ASREML Software. Results showed that heritability for retained placenta, repetitious abortion and infertility traits by animal model were 0.00012, 0.0085 and 0.051, respectively, on the other hand by using threshold model, there was not a reasonable estimation. Genetic correlations between retained placenta and persistency of milk, fat and protein yield were 0.4, 0.32 and 0.38, respectively; with repetitious abortion were 0.14, 0.25 and 0.1; and with infertility were 0.01, 0.09 and 0.02, respectively the phenotypic correlations among these reproductive disorder traits and production traits were relatively low.