Effects of the addition of vegetable fats in the feeding of Holstein cows in the first third of lactation507

Abstract

The genetic selection of dairy cattle has developed high-production animals needing specialized nutrition, sometimes hard to reach or comply. This research objective was to determine the effect of adding three types of grease in the nutrition of dairy cattle. Eight cows were selected, with more than one calving, of first third of nursing between 0-100 days after calving. They were fed based on an ad libitum pasture diet, feed supply, plus treatments of 400g/day of vegetal oil, using: soybean oil, raw palm oil, bypass grease, and a control plot (pasture + feed supply). All animals received treatment on a random basis. Statistic differences were found (p<0,05) for the milk production and weight gain variables, observing that oils had a major performance. The soybean oil has a better consumption compare to raw palm oil and bypass grease. No statistic difference was found for the grease concentration in milk, neither for the fatty acids: linoleic (omega-3) and linoleic (omega-6). Only for the oleic (omega-9) statistic differences were observed (p<0,05) with soybean oil. The best cost-benefit relationship resulted from the use of control plot and raw palm oil.