THE EFFECT OF RUMINAL BYPASS FAT ON MILK YIELDS AND MILK COMPOSITION OF LACTATING DAIRY COW
Keywords:
Rumen-bypass fat, milk production, milk composition, dairy cattleAbstract
A study was conducted to determine the effect of feeding rumen-bypass fat on performance of dairy cows. Twenty four Holstein Friesian crossbred (>87.5% Holstein Friesian) lactating dairy cows in early-mid lactation, averaging 23.3 + 3.5 kg of milk, 85 + 5 days in milk, 60.8 + 5.9 months old and 464 + 43 kg live weight, were stratified for milk yield, days in milk, age, stage of lactation and body weight, and then randomly allocated to two treatment groups. All cows were fed approximately 10 kg of concentrate together with ad libitum grass silage and freely access to clean water. Nil or 300 g of rumen-bypass fat was supplemented to the cows according to the treatment groups. All cows consumed similar amount of concentrate, roughage and total dry matter (DM) and crude protein (CP). There were no significant differences in milk yields and milk composition yields. All cows had similar fat, protein, lactose, solid not fat and total solid percentage in milk. All cows lost similar live weight. Rumen-bypass fat supplementation significantly (p<0.05) reduced C4:0 but increased C12:0 and C14:0 fatty acids of the cows’ milk. The present study indicated that supplementation of rumen-bypass fat did not enhance milk yields, milk composition and live weight change.
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