EFFECT OF CYTOPLASMIC IHERITANCE AND MATERNAL EFFECT ON THE SOME PRODUCTIONAL TRAITS IN HOLSTEIN CATTLE

	EFFECT OF CYTOPLASMIC IHERITANCE AND MATERNAL EFFECT ON THE SOME PRODUCTIONAL TRAITS IN HOLSTEIN CATTLE
AL-TAQANI
Article 1, Volume 22, Issue 1, 2009, Pages 0-0
Abstract
At the Nasr Dairy Cattle Station , United Company for Animal Resources Ltd., Al-Soueira (50 Km south of Baghdad) , over period from 2000 to 2003, 1931 records of total milk production (TMP) , lactation period (LP), service per conception (SPC) and 1032 records of calving interval (CI) produced by 600 Holstein cows were analyzed statistically. The aim of this study was to investigate the effect of cytoplasmic inheritance and maternal effect in TMP, LP, SPC and CI . The SAS program was used to study in estimate of the Components of variance for the random effects in the employed mixed model was estimated by the Restricted Maximum Likelihood procedure. The heritability of the TMP, LP, SPC and CI were 0.18, 0.09, 0.07 and 0.08 respectively at the heritability estimate by half-sib.whereas, increased the estimates to 0.26, 0.12, 0.07 and 0.12 at the estimate by daughter-dam and decreased to 0.15, 0.05, 0.05 and 0.03 respectively at the estimate by half-sib with adjusted of maternal effect. The variance of maternal effect in TMP, LP, SPC and CI were 8265.51, 244.39, 360.50 and 12.04, whereas the variance of cytoplasmic were 2.705, 0.311, 1.422 and 0.091 respectively. Genetic and phenotypic correlation coefficient were 0.75 and 0.85 between TMP and LP, and lower between TMP and SPC (0.07 and 0.03 respectively.

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