ISSN: 1813-0410

Keywords : Genetic evaluation


journal of kerbala university, Volume 3, Issue 2, Pages 304-310

At the Ishaki Dairy Cattle Station (50 km north Baghdad),. and over the period from 2003 to 2006 , 1500 records produced by 600 cows were analyzed. Friesian cows were analyzed statistically . An index for the resistance to metritis was derived for each cow depending on the duration and period of infection , the number of infected and parity of infection . A genetic evaluation of the Friesian at the Station as to their degree resistance to metritis.The General Linear Model within the SAS program (2001) was used to study the effects of fixed factors and estimate of components of variance for the random effects in the employed mixed model was estimated by the Restricted Maximum Likelihood procedure. The Harvey program (1990) was also used to estimate of the BLUP values.Overall means of resistance to metritis (RM) and incidence of the disease(IM) were 81.62 degree and 18.09 % respectively.The effect of parity, season and year parturition on RM and IM were significant.Heritability of RM,TMP(total milk production), SPC(service per consumption) and calving interval (CI) were 0.29 , 0.`19 , 0.04 and 0.06 respectively.The genetic correlation between RM with TMP, SPC and CI were – 0.26 (p<0.01), - 0.09 and 0.04, while the phenotypic correlation – 0.32 (P<0.01) , - 0.11 and 0.05 respectively. BLUP (Best Linear Unbiased Prediction) estimates displayed a wide range among cows included in the current study. Therefore, they are of utmost importance for selection programs aiming at reducing and curtailing the resistance to metritis.