Effect of Pregnancy, Lactation Stage, Parity and Age on Yield and Components of Raw Milk in Holstein Friesian Cows in organized Dairy form in Allahabad

The experiment was carried out on lactating Holstein Friesian cows with the objectives of evaluating the effect of stage of age, pregnancy, lactation, parity and on yield, and components (fat, protein, solid not fat and lactose) and pH of milk. Milk samples were directly collected from the teat and immediately analysed using milk. The result showed that lactation stage and pregnancy significantly (P<0.05) affected the milk yield whereas milk yield did not show significant variation in different age and parity groups. The highest yield was recorded in mid stage and lowest in late stage of lactation. The yield was higher in non-pregnant than pregnant cows. The fat content of the milk was significantly higher (P<0.05) in early and late than mid stage of lactation. However, fat content was not significantly varying with age, pregnancy and parity. The solid not fat (SNF) and protein contents of the milk were significantly different in pregnancy and age but it was not significantly affected by stage of lactation and parity. The lactose content of the milk was affected significantly (P<0.05) by pregnancy only. But the pH of the milk was not affected significantly by stages of lactation, pregnancy, age and parity of the cows. This study indicated that different factors affect the milk yield and milk components.