Finishing steers on sorghum grain and sorghum silage. Effects of grain-to-roughage ratio, urea supplementation and hexoestrol implantation on rate of body-weight gain, feed efficiency and carcass compositions

Morris, J.G.

J Agr Sci 67(2): 191-197


DOI: 10.1017/s0021859600068271
Accession: 014480860

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Six groups, each of 10 steers, were fed increasing quantities of grain. One of the 2 groups, fed each grain-to-roughage ratio, received 60 g urea/head daily. Individual steers were slaughtered when they attained 900 lb. body-weight. A 7th group of 10 comparable steers was slaughtered at the commencement of feeding in order to measure changes in body composition due to the nutritional treatments. The rate of gain of steers fed final rations of 90% and 100% grain was significantly (P < 0.01) greater than steers fed final rations of 80% grain. Efficiency of feed conversion improved as the percentage grain in the ration increased. The addition of 60 g urea/head daily to the ration significantly (P< 0.01) increased rate of gain and efficiency of feed conversion. Implantation of the steers with a pellet containing 24 mg hexestrol did not affect rate of gain or carcass characteristics. Yard feeding increased carcass weight from 278 to 480 lb. Urea-supplemented steers produced carcasses with a significantly higher specific gravity. Dressing percentage increased with finishing but was not influenced by ration treatments. The hepatic vitamin A reserves of the steers fed high-grain rations were rapidly depleted.