Non-genetic factors affecting milk yield and composition of Holstein-Friesian cows nested within natural ecological regi
Journal Title: Scientific Journal of Animal Science - Year 2013, Vol 2, Issue 5
Abstract
Milk production is affected by genetic and non-genetic factors. Knowledge of these factors is essential for efficient management and accurate estimation of breeding values. The objective of this study was to establish and analyze non-genetic factors which affect milk production and composition in Holstein-Friesian cows. A total of 4 500 milk records from the Zimbabwe Dairy Services Agency (ZDSA) from 1999 to 2004, were used. Natural ecological region, month of calving and year of calving had significant (P<0.05) effect on milk yield, protein and fat composition. Therefore, correction for environmental effects is necessary to increase accuracy of direct selection for milk yield and composition.
Authors and Affiliations
G. B. Nyamushamba| Faculty of Agriculture, Women’s University in Africa, P.O.Box, MP 1222, Mt Pleasant, Harare, Zimbabwe., B. Tavirimirwa*| Department of Research and Specialist Services, Matopos Research Institute P Bag k5137, Bulawayo, Zimbabwe., N. Y. D. Banana| Faculty of Natural Resources Management and Agriculture, Midlands State University, Gweru, Zimbabwe
Keywords
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