Meta-analysis of factors affecting carcass characteristics of feedlot steers.

摘要: A meta-analysis was conducted to assess the effects of biological type (early-moderate or late maturity) and implant status (estrogenic, combination, nonimplanted; repeats included) on HCW (kg); LM area (cm2); 12th-rib fat thickness (fat thickness, cm); KPH (%), intramuscular (%) at harvest, provide inputs an ongoing program for modeling beef cattle growth carcass quality. Forty-three publications from 1982 2004 with consistent data were evaluated. Two studies undertaken: 1) as a covariate 2) BW covariate. The intercept-slope covariance estimate not statistically different 0 (P = 0.11), 0.19), 0.74) in study 1, 0.44), 2; therefore, reduced model without component fitted these characteristics. 0.01, 1 P 0.05, 2). In results maturity indicated differences between early-moderate < 0.01) but no 0.26) 0.50); status, estrogenic combination increased by 2.9% 0.27) 4.8% 0.01), 3.2% 0.23) 6.3% decreased 8.1% 5.4% respectively, 7.6% 0.34) implants 1.1% 0.36) implants, compared nonimplanted steers. 2, 600 kg (implant nonimplant) 0.63) 0.73), there 0.01); 0.94), 0.01). difference (studies confirmed that frame size accounts substantial portion variation composition. Studies 2 also indicate had significant