The Influences of age on lactation length and milk yield in Kenana and Butana cows.

Abstract

The mean lactation milk yield for the Kenana and Butana herds were 
2136±168 kg and 1807 ± 592 kg produced in a mean lactation period of 
283± 40 days and 283 ± 57 days respectively. In both herds the 
maximum lactation milk yield was attained in the third lactation. The 
maximum lactation milk yield was attained by Kenana cows 61/2 - 712 
years of age and Butana cows 512-61/2 years of age.