Desempenho de novilhos alimentados com rações contendo silagem de capim papuã (Urochloa plantaginea) x silagem de sorgo (Sorghum bicolor (L.) Moench)

Abstract

This study aimed to evaluate the parameters related to feedlot beef steers fed with Alexander grass silage or sorghum silage as roughage source. Twelve animals with initial average of weight and age of 245 kg and 20 months, respectively, belonging to Nellore (N), Charolais (C), N genetic groups were used. The ration was composed by a roughage:concentrate relation of 50:50 (dry matter basis), offered at ease. The dry matter, crude protein, ether extract, neutral detergent fiber and acid detergent fiber daily intake didn't differ between roughage sources, being the medium values of 10.18; 1.28; 0.20; 4.96 and 2.51 kg/day, respectively. However, the ether extract intake by metabolic size and by corporal weight percentage were higher for the one that consumed sorghum silage, obtaining values of 2.74 and 2.36 g/metabolic size and 0.06 and 0.05 kg/100 kg of live weight. The same behavior was observed for digestible energy intake, presenting values of 364.87 and 302.83 g/metabolic size and 8.10 and 7.02 kg/100 kg of live weight. The daily average gain, final corporal score and feed conversion weren't influenced by roughage type, being the values of 1.31 kg; 4.05 points and 7.78 kg of DM/kg of weight gain, respectively. The Alexander grass silage is a feasible alternative as its substitution in relation to sorghum silage.

Padrões Comportamentais De Bovinos Confinados Com Grãos De Milho, Aveia Branca Ou Arroz Com Casca

“…Os animais do tratamento grão de milho apresentaram maior tempo em ócio total (Tabela 3), comparados aos animais do tratamento grão de arroz, que por sua vez permaneceram maior tempo em ócio que os animais alimentados com dieta à base de grão de aveia. O ócio representa o tempo em que o animal não está ingerindo alimento e nem ruminando, podendo estar em pé ou deitado, mas geralmente os animais permanecem maior tempo em ócio deitados no período noturno (2) . Quando se avalia o tempo de ócio de um animal, essa variável se torna importante em animais de produção, ou seja, o animal que está em ócio terá seus gastos em energia reduzidos (19) .…”

Chemical composition and in situ degradability of silages from dual-purpose sorghum hybrids

“…The use of sorghum silage has been increased because the corn crop presents a lower water shortage tolerance than the sorghum crop. The tolerance of sorghum to water restriction is probably related to water uptake and transport (ARGENTA et al, 2014;LIU et al, 2014).…”