Urea as a limiter in cattle diets: final report [beef]
1987
Barker, D.J. | May, P.J. (Western Australian Dept. of Agriculture, Bunbury) | Jones, W.M. | Milligan, J.W. (Western Australian Dept. of Agriculture, Vasse Research Station)
In 3 experiments, the first showed that short term control of the composition of the diet selected by cattle fed ad lib low quality roughage and an ad lib grain supplement could be achieved by feeding up to 20 percent urea in a grain supplement. Experiment 2 showed that continuous control of the composition of the diet selected by cattle could be achieved for 2 months by providing ad lib milled grain supplements containing different levels of urea. The diet selected and the response to high levels of urea also varied according to the quality of the roughage provided ad lib concurrently. Experiment 3 showed that ammonium sulphate (AS) is a more effective and economical additive for controlling the intake of milled grain supplements fed ad lib to cattle. By adding from 1 to 8 percent AS, intake of a grain supplement can be controlled to between 60 percent and 20 percent of the total diet when a low quality hay is also provided ad lib, at a cost of between 3.20 and 6.50 Australian dollars per tonne of diet.
显示更多 [+] 显示较少 [-]