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Genetic and non-genetic factors affecting production potential of Butana dairy cows at Atbara Research Station, Sudan

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Author(s): T. M. Badri, | M. Atta, | Mohamed T. Ibrahim | K. A. Gubartalla

Journal: Research Opinions in Animal & Veterinary Sciences
ISSN 2221-1896

Volume: 1;
Issue: 7;
Start page: 429;
Date: 2011;
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Keywords: Butana Cows | Longevity | Lactation Period | Persistency | Milk Yield

ABSTRACT
Effects of year and season of calving and cows' parity order on milk yield, lactation period, persistency and longevity were studied using 1338 records of 222 Butana dairy cows. Estimates of heritability and repeatability of these traits were also studied. Data were classified according to years of calving into 1949 –1959, 1960-1969, 1970-1979, 1980-1989 and 1990–1999 groups. Further data classification was done according to season of calving into dry summer (March–June), wet summer (July-October) and winter (November-February) groups. Data were also classified according to cow's parity order into ten parity groups. General linear model was conducted to examine the significance of the tested effects. Overall means of total milk yield, lactation period, persistency and longevity were 1709.50 ± 892.10 kg, 248.40 ± 91.30 days, 75.16 ± 48.58% and 6.56 ± 3.18 years, respectively. Milk yield was significantly affected by year of calving and parity order, persistency was not affected by any of the studied factors, while longevity was affected by year and season of calving. Heritability of these traits was low (ranged between 0.01 and 0.14) while repeatability ranged between 0.17 and 0.23. The study concluded that Butana breed are promising dairy cows and their production potential traits were mainly affected by the non genetic environmental factors such as managerial changes during years, seasonal variations and age of cows. However, the traits values were repeatable during the animal’s life.
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