The estimation of genetic and environmental parameters and genetic and phenotype and genetic trend strand for reproduction traits of Holstein cows was Khoramdare Culture Technology
2011
Deljoo Isaloo, H.A., Assistant Department of Animal Sciences,Zanjan University, Iran | Eskandari Nasab, M.P., Ms.c.Genetic and Animal Breeding. Zanjan University, Iran
In the present research some reproductive traits in Holstein cows of Khoramdareh agro-industry were studied. The data set comprised of 10,891 records collected from 23 years (1988 to 2010) by animal breeding centre, Iran. The total number of animals in the pedigree file was 16/087. Genetic and phenotypic parameters using soft WOMBAT software and restricted maximum likelihood method under animal models and a multivariate trait was estimated. Genetic trend for each trait was estimated using SPSS programmer based upon regression of mean breeding value on year of calving. Phenotypic trend was also estimated based upon regression of phenotypic mean of the trait on year of calving. Levels of heritability from linear model for the traits age at first insemination (AFS), age at first calving (AFC), number of insemination resulted in conception (NSPC), open days (OD), pregnancy rate (PR), calving interval (CI), Non return rate to 90 days (NRR90) respectively 0.037, 0.016, 0.01, 0.032, 0.021, 0.051 and 0.034, respectively. Maximum genetic correlation between traits and open days and pregnancy rates between insemination number of days open and pregnancy, respectively, leading to -0.99 and 0/84 and the lowest genetic correlation between PR with NRR90 (0.001) respectively. Open days and pregnancy rate with the open days and NRR9 respectively Olsen -0.99 and 0.00 the highest and lowest phenotypic correlation showed. Genetic trend for the reproduction traits was between -0/009 for NRR90 and -0/04 for CI respectively. Phenotype trend for the about traits has lower trend for (0/002) NRR90 and (-0/74) for AFS respectively. Lower among environmental trend (-0/007) for NSPC and upper among environmental trend for AFS (-6/52) respectively.
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