Boneless yield of carcass of feedlot-finished young Bos indicus L. bulls

Abstract

The aim of this study was to evaluate the boneless yield of the carcass of 64 feedlot-finished young Nellore bulls fed diets containing coated or uncoated urea and slaughtered at five body weights (350, 455, 485, 555, and 580 kg). A completely randomized design with a 5 × 2 factorial arrangement was used. No significant effect was detected for the interaction between slaughter weight and diet; therefore, the variables were analyzed separately, compared by polynomial contrasts and the F test, respectively. The absolute weights of the primal cuts from the fore-and hind-quarter increased linearly as the slaughter weight of the animals increased. Increasing slaughter weights elevated the percentage of rump cap in the pistola hindquarter as well as its yield. The percentages of the rump cap and rump skirt increased linearly, whereas those of knuckle, tenderloin, flank steak, rump, and outside flat decreased and the sum of prime cuts had a quadratic effect in relation to the weight of the right 1/2 carcass. Increasing slaughter weights led to a higher percentage of fat from the trimming of the hindquarter cuts relative to the weight of the 1/2 carcass. The weight of meat cuts was similar between the groups of animals fed coated and uncoated urea. Higher slaughter weights generate heavier meat cuts but lower percentages of primal cuts from the pistola hindquarter relative to the carcass weight.Key words: Animal products; cattle; meat; prime cuts; Nellore breed; diet; minimum weight; optigen®. ResumenEl objetivo de este estudio fue evaluar el rendimiento deshuesado en canal de 64 toros jóvenes Nellore alimentados en corral con dietas que contienen urea recubierta o sin recubrir y sacrificados a cinco pesos corporales (350, 455, 485, 555 y 580 kg). Se utilizó un diseño completamente aleatorizado con un arreglo factorial de 5 × 2. No se detectó ningún efecto significativo para la interacción entre el peso de sacrificio y la dieta; por lo tanto, las variables se analizaron por separado, en comparación con los contrastes polinómicos y la prueba F, respectivamente. Los pesos absolutos de los cortes primarios del cuarto anterior y posterior aumentaron linealmente a medida que aumentaba el peso del sacrificio de los animales. El aumento de los pesos de sacrificio elevó el porcentaje de la tapa de la grupa en el cuarto trasero de la pistola, así como su rendimiento. Los porcentajes de la gorguera y la falda de la rabadilla aumentaron linealmente, mientras que los de nudillo, lomo, filete de flanco, grupa y plano exterior disminuyeron y la suma de los cortes primarios tuvo un efecto cuadrático en relación con el peso de la mitad de la carcasa. El aumento de los pesos de matanza condujo a un mayor porcentaje de grasa del recorte de los cortes del cuarto trasero en relación con el peso de la carcasa 1/2. El peso de los cortes de carne fue similar entre los grupos de animales alimentados con urea recubierta y no recubierta. Los pesos de sacrificio más altos generan cortes de carne más pesados pero porcentajes más bajos de ...

Effects of the Duration of Zilpaterol Hydrochloride Supplementation and Days on Feed on Performance, Carcass Traits and Saleable Meat Yield of Nellore Bulls

“…Increasing DOF from 90 to 117 days resulted in higher yields for the majority of cuts from the forequarter, however, the opposite was observed in the hindquarter, where animals fed for 90 d showed higher yields in 7 out 10 cuts evaluated. It is well-known that the forequarter proportion increases as the intact males became older [42][43][44], and consequently, the yield of cuts of forequarter also increases, which can explain why bulls fed longer (117 d) had mostly, higher cuts yields than those fed 90 d. In addition, it is worthwhile to point out that testosterone has an increased effect on the growth of the forequarter and neck muscles of males, and at the age of the animals used in this study (24 months old), testosterone has an active role on animal metabolism. In contrast, the same fact can explain the higher yields of hindquarter cuts observed in animals fed 90 days, once there is an increase in forequarter proportion there will be a proportional decrease in hindquarter proportions and cuts yields, as observed in this work.…”