Some factors affecting incidence of retained placenta for a herd of Holstein cows in Iraq
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Date
2008
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Kerbala University
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Abstract
A total of 19235 records were analyzed which belonged to 5148 Holstein cow and 89 sire for the period from 1990 - 2004 , at Nasr Dairy Cattle Station. The aim of the research is to investigate the effect of some environmental fixed factors on incidence of retained placenta and to estimate heritability of the mentioned trait. General Linear Model within the SAS (2001) program was used to study the effects of some fixed factors ( season and year of calving, parity sex of calf )on the incidence of retained placenta.The overall means for retained placenta was 11.09%.The effect of all fixed factors were significant (P < 0.01 ) . Component of variance for the random effects in the employed mixed model were estimated by the Minimum Variance Quadratic Unbiased Estimation (MIVQUE) method. The heritability of retained placenta was 0.10