Nulliparous versus primiparous crossbred females for beef
1991
Bailey, C.M. | Reid, C.R. | Ringkob, T.P. | Koh, Y.O. | Foote, W.D.
Feedlot and carcass traits of nulliparous and primiparous females representing eight breed types, including Bos taurus and Bos indicus X Bos taurus crosses, were evaluated. Nulliparous females (heifers) were in the feedlot for 4 mo; primiparous females (heiferettes) were fed for 2 1/3 mo after their calves were weaned at 6 mo of age. Heifers averaged higher (P < .01) in dressing percentage, percentage of kidney fat, carcass grade (P < .10), and color of lean (P < .05) compared with heiferettes. Heiferettes exceeded the nulliparous group in feedlot ADG (P < .01), fat thickness (P < .05), and percentage of steak, roast, and bone (P < .01). Parity effects on carcass weight, longissimus area, marbling, pH, and shear force value were not statistically significant. Dam breed types differed in several traits, including marbling (P < .05) and percentage of steak (P < .10), roast (P < .01), and bone (P < .01). Dam breed X parity interactions were nonsignificant. Results show that beef derived from heiferettes is competitive with heifer beef.
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