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University of Khartoum (2007)

Genetic And Environmental Factors Affecting Friesian Reproductive Performance In Khartoum State, Sudan

Omar, Romaz Mohamed Ahmed

Titre : Genetic And Environmental Factors Affecting Friesian Reproductive Performance In Khartoum State, Sudan

Auteur : Omar, Romaz Mohamed Ahmed

Université de soutenance : University of Khartoum

Grade : Master of Science (MS) Animal Production 2007

Résumé partiel
This study was conducted to investigate the reproductive performance and to estimate some genetic and phenotypic parameters of five traits in Holstein Friesian cattle under Sudan conditions. The data was obtained from the dairy farm of Azaheir Company for Aِِgriculture and Animal Production at El Bageir. The data used encompassed the first five lactations in 4784 records on 2998 cows covering the period from 1982 to 1998. The data was cleaned by removing errors and outliers and subjected to statistical analysis using Harvey’s (1990) least- squares computer programme. The least squares mean for age at first calving was 28.98 ± 0.35 months, calving interval 14.74 ±0.13l months, open period 131.7 ± 2.08 days, number of service per conception 2.36 ± 0.21 and reproductive efficiency 80.797 ± 0.614%. The analysis of variance shows that sires had a highly significant effect (p< 0.01) on age at first calving, number of services per conception and reproductive efficiency. It was found to have a significant effect (P < 0.05) on calving interval and open period. Yearseasons of birth of cows had a highly significant effect (p< 0. 01) on age at first calving. Also, the effect of year-seasons of calving had a highly significant effect (p<0.01) on calving interval,open period and reproductive efficiency. The effect of parity number on calving interval and reproductive efficiency had highly significant (p<0.01), while it was not significant (P >0.05) on open period and number of services per conception

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