The effect of dietary protein level on milk yield and composition of dairy cows in the Gezira

Abstract

Thirty milking cows (Kenana or Butana X Frisian) in their second to 
fourth lactations were used under two management conditions in two 
separate farms to study the effect of three levels (High, Medium and 
Low) of dietary crude protein supplement on milk yield and milk 
composition. 
The crude protein levels were 204,175 and 140g/kg DM and 176, 153 
and 129 g/kg DM. in Farm 1 and 2 respectively. Undpr both 
management conditions increasing the dietary protein level significantly 
increased the milk yield and milk protein but not the milk fat. A dietary 
crude protein level of 130-175 g/kg DM was suggested for high milk 
yield under the Gezira management conditions.