<b>Concentrate levels of crossbred bulls slaughtered at 16 or 22 months: performance and carcass characteristics

Abstract

This study was performed to assess the animal performance of 97 bulls, ½ Purunã vs. ½ Canchim, that were slaughtered at 16 (16M) or 22 (22M) months with three concentrate levels (0.8, 1.2, and 1.6%) of body weight (BW). The initial body weight was lower for the 16M bulls. The final body weight and hot carcass weights were similar between the two slaughter ages. The hot carcass dressing was higher for 22M bulls. The average daily gain was higher for 16M bulls. The feed intake and dry matter feed conversion were similar between 16 and 22M bulls. The carcass length, marbling, and bone percentage were lower for 16M bulls. However, the Longissimus dorsi muscle area was higher for 16M bulls. The leg length, cushion thickness, fat thickness, conformation, colour, texture, muscle percent, and fat percent were similar between 16 and 22M bulls. The final and hot carcass weights were lower for bulls that were fed with 0.8% of BW. The carcass dressing was similar for the three concentrate levels. The average daily gain was higher for bulls that were fed with 1.6% of BW of concentrate and lower for those that were fed with 0.8%. The concentrate levels had no effect on carcass characteristics, feed intake, and dry matter conversion.

Produção de novilhos castrados ou não castrados terminados em confinamento em idade jovem ou superjovem

“…A similaridade observada na condição sexual também foi observada por Vittori et al (2007), enquanto Marcondes et al (2008) constataram melhor CA em favor dos animais não castrados. Em se tratando de categoria, diferentemente deste experimento, Prado et al (2015) e Pinto et al (2015) verificaram que os animais superjovens foram mais eficientes em converter alimento consumido em ganho de peso em relação aos jovens, porque apresentaram CMS semelhante e maior GMD, diferentemente deste experimento, em que os superjovens apresentaram menor CMS mas também ganharam menos peso que os animais jovens.…”

Growth performance, body composition, carcass traits and meat quality of young Nellore bulls fed freshly cut or ensiled sugar cane

“…However, when comparing gain efficiency, animals fed sugarcane silage were more efficient, even with lower proportions of concentrate (50% sugarcane silage). Regarding differences in the proportion of concentrate, greater concentrate levels in the diet usually cause increases in daily weight gain by supplying metabolizable energy and protein in greater concentrations than roughage (Bezerra et al, 2013;Pinto et al, 2015;Pouzo et al, 2015).…”

Efecto del genotipo y alimentación final sobre cortes cárnicos comerciales y calidad de canal en novillos

“…Cuando se compara la eficiencia en el crecimiento animal como efecto de la suplementación, los animales con raciones más concentradas en nutrientes mejoran su desempeño (Avilés et al, 2015). Estas diferencias en la suplementación implican que, las dietas más enriquecidas en nutrientes mejoren la ganancia diaria de peso, porque se suple más energía metabolizable y proteína que un sistema de alimentación a base de forraje (Bezerra et al, 2013;Pinto et al, 2015;Pouzo et al, 2015).…”

“…El cruzamiento ha sido utilizado como una herramienta que reduce el plazo de producción de carne (Purchas y Morris, 2007;Pinto et al, 2015), debido a que los animales cruzados son más precoces que los altamente seleccionados (Bos indicus o Bos taurus).…”