Líquido da casca da castanha de caju associado a fontes de nitrogênio não proteico na alimentação de bovinos

• Autor(a) principal: Osmari, Milene Puntel
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)
• Texto Completo: http://repositorio.uem.br:8080/jspui/handle/1/1584
• topic: Bovinos; Nutrição; Dietas de alto grão; Nitrogênio não proteíco; Aditivo natural; Alimentação; Novilhos; Brasil.; Cattle; Nutrition; High-grain diets; Non-protein nitrogen; Natural additive; Power; Bullocks; Brazil.; Ciências Agrárias; Zootecnia

This research was carried out to evaluate the effects of cashew nut shell liquid (CNSL) levels and two sources of non-protein nitrogen (urea and urea slow release) in concentrate of cattle fed high grain diets on dry matter intake (DMI), nutrients digestibility, ruminal fermentation and kinetics. The experimental design used in the experiments was the Latin square with experimental periods of 10 days for the first experiment and 14 days for the second. In the first experiment, four Holstein steers (425 kg) were used. The treatments consisted of increasing levels of CNSL in concentrated distributed as: Control= no CNSL, 0.03% CNSL = 300 mg.kg-1 of concentrate, 0.06% CNSL = 600 mg.kg-1 of concentrate and 0.12% CNSL = 1200 mg.kg-1 of concentrate. DMI, ruminal apparent digestibility (RAD), intestinal apparent digestibility (IAD) and total apparent digestibility (TDC) of dry matter (DM), organic matter (OM), crude protein (CP) , neutral detergent fiber (NDF), starch and non-fiber carbohydrates (NFC) were not influenced (P>0.05) by experimental diets. The levels 0 and 300 mg of CNSL/kg of concentrate, provided lower ruminal apparent digestibility of ether extract (EE). Ruminal pH for animals that consumed the LCCC was higher (P<0.05) than animals that did not consume CNSL. The amounts of ammonia, plasma urea nitrogen and microbial efficiency were not affected by experimental diets (P>0.05). As a conclusion of this first experiment, the CNSL can be an alternative food additive able to control ruminal pH in high-grain diets, decreasing the risk of rumen acidosis. In the second experiment, four Holstein steers (316 kg) were used. The treatments consisted of associate or not of CNSL with two sources of non-protein nitrogen (NPN). DMI, RAD, IAD and TAD of DM, OM, CP, NDF, EE, starch and NFC were not influenced (P>0.05) by experimental diets. The association or not of the LCCC to protein sources did not affect (P>0.05) ruminal kinetics.