Body and carcass composition of Angus and Charolais steers as affected by age and nutrition.

摘要: The objectives of this study were to examine the effects a low vs moderate rate gain during growing phase on empty body and carcass composition finishing Angus Charolais steers two ages. Forty-eight 48 that either spring-born (OLDER) or fall- born (YOUNGER) fed diets (alfalfa pellets (CON) cubed grass-alfalfa hay, wheat straw, cottonseed hulls, soybean meal (RES)) for period followed by conventional feedlot period. started when YOUNGER-CON weighed same as OLDER-RES steers. At time, an interaction age x diet occurred in fat content (P < .lo), whereas breed affected .01). OLDER-CON larger (average 378 kg BW) fatter than other, smaller groups 222 kg). carcasses end phase, compensating (OLDER-RES) had Empty was .lo). Allometric regressions (Y = axb) BW indicated accretion greater YOUNGER OLDER A .lo) OLDER-Angus higher accretive rates YOUNGER-Angus, OLDER-CON-Charolais deposited more slowly remaining groups. These data suggest receiving at light weights, whether young previously restricted, ac- cumulate rapidly do This feeding strategy may be advantage late- maturing types, but growth through approx- imately 75% slaughter weight is recommended early-maturing types.