Effects of Progesterone-Estradiol Implants, Grain Feeding and Kinds of Irrigated Pastures on Steer Performance and Carcass Quality

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Abstract
Results are presented from a randomized complete block design experiment in which progesterone-estradiol treatments were administered to yearling steers on three kinds of irrigated pastures. The responses of these animals were compared with others not implanted but grazing the same kinds of pastures. Daily gains and animal gains per acre were significantly increased by the hormone implant. Grain feeding erased the effect of implants on the rate of daily gain. Carrying capacity of the pastures grazed by implanted animals was not significantly lower than for the non-implanted. The implanted cattle apparently utilized their forage from 13 to 19% more efficiently than the non-implanted. There were no significant differences in grade, marbling, rib-eye area or lb. of carcass per sq. in. of rib-eye area between carcasses of implanted and non-implanted cattle. Intra-pasture differences were noted for carcass yield, fat cover and transit shrinkage. Copyright © . .

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