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Feed Requirements for Maintenance and Gain in Crossbred Bulls of Two Types¹

Washington State University^,3, Pullman 99164

Abstract

Growth rate and individual feed consumption of 24 Jersey x Angus (J x A) and 22 Simmental x Angus (S x A) bulls were used to compare requirements for maintenance and gain during the postweaning growth period. The 82% concentrate diet contained 3.4 Meal digestible energy (DE)/kg. Periods I and II were each 84 d long for J x A and 112 d for S x A. Bulls were fed either 1.2, 1.7 or 2.2 times their estimated feed requirement for maintenance during periods I and II and full fed to slaughter during period III. After period I, the bulls from each feed level were further subdivided for the three feed levels for period II. Bulls averaged 242 d of age and weighed 221 and 240 kg at the start of period I for J x A and S x A, respectively. Averaged over periods I and II average daily gains (ADG) were .14, .66 and 1.09 kg/d for 1.2, 1.7 and 2.2 feed levels, respectively, for J x A and .26, .84 and 1.26 kg/d, respectively, for S x A. No compensatory gains were observed among bulls moved from low intakes in period I to higher intakes in period II. Weight (W) and ADG were related (P<.01) to DE, Mcal/d in period I, while W, ADG and the interaction breed-cross (B) x ADG were related (P<.01) to DE in period II. The B x W interaction effects were very small and nonsignificant in both periods. Multiple regression equations for period I were DE = 2.319 + .028 W + 10.773 ADG for J x A and DE = –1.324 + .039 W + 11.270 ADG for S x A. In period II DE = .132 + .039 W + 9.013 ADG for J x A and DE = –.787 + .033 W + 11.588 ADG S x A. Thus, at average W and ADG, DE requirements for J x A and S x A differed in both periods I and II, but maintenance requirements based on W were the same. The J x A required less feed for gain than S x A in both periods I (Pì.10) and II (ì.01).

¹ Scientific Paper No. 6033. College of Agr. Res. Center, Washington State Univ., Pullman' 99164. Project No. 1692.

² The authors express their appreciation to Daniel J. Coonrad for his dedicated assistance in conducting this study.

³ Anim. Sci. Dept.