PSIII-30 Feedlot performance and carcass characteristics of Angus and Wagyu sired cattle raised to a similar body weight endpoint

摘要

Angus and Wagyu sired calves were used in an incomplete block design experiment to investigate breed differences for growth at a similar body weight. Cattle were individually fed a common corn silage based growing diet for 4 months and transitioned to a common finishing diet for the remainder of the study. Treatments were as follows: T1) Angus sired steers (n = 13) harvested at 612 kg, T2) Wagyu (LMR Fukutsuru 729T) sired steers (n = 4) and heifers (n = 5) harvested at 612 kg, T3) Wagyu (OW Yasufuku 229Y) sired steers (n = 5) and heifers (n = 8) harvested at 612 kg. Data were analyzed in SAS using the mixed model: Yij = μ + Ti + sj + eij, where Ti was the fixed effect of treatment, sj was the random effect of sex, and eij was the random error. Contrasts were made to compare T1 vs. T2 and T3, and T2 vs. T3. Receiving weight was greater (P ≤ 0.02) for Angus sired cattle compared to Wagyu sired cattle, and Fukutsuru sired cattle had greater (P ≤ 0.05) receiving weights compared to Yasufuku sired cattle. Off-test weights were similar across treatments (P = 0.49). Wagyu sired cattle required more days on feed (P ≤ 0.01), resulting in a greater age at harvest (P ≤ 0.01) compared to Angus sired cattle. Fukutsuru sired cattle tended to require fewer days on feed (P = 0.07) and be younger at harvest (P = 0.10) compared to Yasufuku sired cattle. Angus sired cattle had greater ADG (P ≤ 0.01), DMI (P ≤ 0.01), and G:F (P ≤ 0.02) compared to Wagyu sired cattle. Angus sired cattle had a lesser percentage of KPH fat (P ≤ 0.01) and tended to have more desirable YG scores (P = 0.06) compared to Wagyu sired cattle. Wagyu sired cattle had greater marbling scores (P ≤ 0.01) compared to Angus sired cattle, while Yasufuku sired cattle had greater marbling scores compared to Fukutsuru sired cattle.