Licuri oil supplements for lactating cows on pasture

Abstract

As licuri [Syagrus coronata (Martius) Beccari] oil can be a beneficial energy source in the diet of lactating cows managed on pasture, this study aimed to determine the most effective level of licuri oil in feed supplements. Sixteen Holstein×Zebu crossbreed lactating cows grazing on Tanzania (Panicum maximum) pasture grass were grouped into two 4×4 simultaneous Latin squares; there were four experimental periods of 21 d each, with 17 adaptation days and 4 d of data collection. The treatments were diets containing 0.0, 15.0, 30.0 or 45.0 g kg−1 of licuri oil in concentrated dry matter. The intakes of dry matter, crude protein and non-fiber carbohydrate levels were not affected by the addition of licuri oil; however, the intake of neutral detergent fiber and total digestible nutrients decreased linearly. Neutral detergent fiber digestibility was reduced linearly with increasing levels of licuri oil in the concentrate. There were no changes in blood glucose levels, but blood urea nitrogen levels varied according to the time of the day when the blood was collected. Inclusion of licuri oil at 45.0 g kg−1 in feed concentrates results in improved dry matter and ether extract digestibility.