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SOME ENVIROMENTAL AND GENETIC EFFECTS | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 20, Issue 1, 2015, Pages 0-0 | ||
| Author | ||
| A. A. Naif | ||
| Abstract | ||
| This study depended on 1663 records included veterinarian, breeding, Pedigree records belong to 248 Holstein neonatal calves from birth to one month aged at the Nasr dairy cattle station in Al-Soueira. The results taken from records were statistically analyzed by General Linear Model (GLM ) Within the SAS Program (2010) used to study the fixed effects of weight at birth, birth type, sex, and season of infection on the Enteric infection. Restricted Maximum likelihood procedure produced to estimate the Variance component for random effects. The general mean for Enteric morbidity rate was 0.13% and this percentage not affected by weight at birth and sex and different significantly (p<0.05) according to birth type, while the incidence rate affected by season (p<0.01). Higher morbidity rate was 0.33% for neonatal at birth weight less han 25kg. Disease accurate between twins more than single neonatal was 0.32% and 0.15% respectively, so the infection occoured nearily the same between calves and heifers, at spring the infections increased and received to 0.30% while reduced to 0.19% at summer. Heritability and Repeatability for Enteric infection was 0.16 and 0.17 respectively. Genetic and phenotypic correlation coefficient between Enteric disease and weight at birth was significantly (p< 0.05) and negative received to -0.89 and -0.68 respectively. | ||
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