Non-genetic causes of the heterogeneity of variance in milk yield among Holstein-Friesian Herds in Kenya
Abstract
Lactation records of Holstein- Friesian cows in Kenya made during the period 1968 to 1984 were analyzed for the cases of heterogeneity of variance in milk yield among herds using a fixed effect least squares model. Year, herd, herd class, parity, calving interval and lactation length all influenced milk yields significantly (p<0.01), while season of calving didn't (p>0.05). age at calving affected 305 days milk yields significantly ( P<0.005). it was concluded that adjustment of records for these non-genetic effects could minimize heterogeneity of variance in milk yield among Holstein-Friesian herds in Kenya.
URI
http://www.ajol.info/index.php/kenvet/article/view/39529http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/50196
Citation
Olukoye, G. A., and R. O. Mosi. "Non-genetic causes of the heterogeneity of variance in milk yield among Holstein-Friesian Herds in Kenya." Kenya Veterinarian 25.1 (2007): 18-23.Publisher
University of Nairobi, college of agriculture and veterinary services,