Milk production characteristics of holstein friesian Cattle at Holetta government dairy farm, Ethiopia
2002
Mureja Shiberu (National Artificial Insemination Centre, Addis Abeba (Ethiopia))Eskil Brannang
Data on milk production were collected from the Holetta Government Dairy farm form the years 1967-1991, and totally 1384 lactations were used. The milk production traits including total lactation milk yield, lactation length and annual milk yield were analysed to know the mean production level of the breed and the environmental components of variances. The independent variabless examined were year and season of calving, parity and interaction between these factors.The effect of year of calving was significant for all the traits and this was ascribed to drought cases in some of the years under study and the change in the ownership within the farm. The mean annual milk yield, which is a function of both lactation yield and calving interval was much less than the lactation yield indicating that factors affecting the reproductive traits should be treated to bring about an economic dairy productivity.
显示更多 [+] 显示较少 [-]