Fontes de fibra sobre a digestibilidade e comportamento ingestivo em bovinos da raça nelore confinados

• Autor(a) principal: Lima, Douglas de Almeida
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/001300000dcnw
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/3311
• topic: Fibra fisicamente efetiva; Acidose ruminal; Fontes de fibra; Bagaço de cana; Milho inteiro; Resíduo de milho; Physically effective fiber; Ruminal acidosis; Fiber sources; Sugar cane bagasse; Whole corn; Corn by product silage; NUTRICAO E ALIMENTACAO ANIMAL::AVALIACAO DE ALIMENTOS PARA ANIMAIS

This trial was realized in the veterinary and animal science school at Universidade Federal de Goias. The objective was to evaluate five diets, four of these diets was composed by ground corn with different fiber sources for each ration and one control treatment with whole corn (MI) without fiber source. The fiber sources used was sugar cane bagass (BIN), industrial corn residue silage (RM), soybean hulls (CS), cotton seed (CA). Five castrated Nellore steers with an average of 195 kg of body weight and with rumen fistulae, were used in this trial. The animals were distributed in individual pen provided of individual covered feeder and water tank for each two animals. Each period spent 19 days, with 10 days for food adaptation and nine days for collect of data. During the interval of collects were evaluated: feed behavior, ruminal pH, ammoniacal nitrogen, short chain of fatty acids, total counting of protozoa, fecal pH, total digestibility and dry mater, crude protein (PB), ether extract (EE), neutral detergent fiber (FDN) and acid detergent fiber (FDA) intakes. Latin square and Duncan test for 5% of probability were used for statistical analysis. The treatment BIN had the highest dry matter intake, although CA had the lowest value. The ether extract intake was highest for MI treatment, followed by CA and the CS had the lowest value. The highest values for FDN and FDA intakes were in treatment BIN. It was observed some rejection of cotton seed by the animals. The values for total digestibility for CA, RM, BIN, CS and MI treatments were 68.50; 66.19; 65.87; 64.20 e 56.15. The treatment CA showed greater DMD than CS (P<0.05). The treatments RM and BIN spent more time for ruminating and chewing activity. The value of ruminal pH in treatment BIN was greater than RM and CS (P<0.05). The treatments MI and CA weren´t different from RM and CS (P>0.05). In protozoa counting the highest numbers were observed for CS and BIN treatments. Although the lowest numbers for protozoa counting was founded for CA. Animal differences were noted in protozoa counting. The highest values for total short chain fatty acids were founded for CS, that was the same of RM (P>0.05), although BIN, MI and CA had the lowest value. Highest xiv values for propionate and acetate were found in CS treatment. The acetate:propionate ratios were higher in BIN, but for the others treatments the value didn´t differed between them (P>0.05). Butyrate, ammonia nitrogen and fecal pH any differences were found (P>0.05). It was concluded that sugar cane bagasse was the fiber source that keep a good result for ruminal pH, protozoa counting, dry matter intake and the total digestibility wasn´t different from the others. According to that we can conclude that sugar cane bagasse showed more efficient than the others fiber sources in the tested levels.