Revista Brasileira de Zootecnia | |
Fibrolytic enzymes and dry matter content of Tanzaniagrass silages on the ruminal parameters, ingestive behavior and nutrient digestion of bovine | |
Paziani, Solidete de Fátima1 Zopollatto, Maity1 Schmidt, Patrick1 Campos, Fábio Prudêncio de3 Mari, Lucas José1 Junqueira, Marta Coimbra1 Loures, Daniele Rebouças Santana1 Nussio, Luiz Gustavo1 Ribeiro, José Leonardo1 Packer, Irineu Umberto1 Pedroso, André de Faria2 | |
[1] USP, Piracicaba;EMBRAPA, São Carlos;Instituto de Zootecnia, Nova Odessa | |
关键词: digestibility; direct-fed application; fibrolytic enzymes; ingestive behavior; Panicum maximum; wilting Introdução O emurchecimento de forragens úmidas exerce efeito de concentração de substrato; que; juntamente com o aumento do potencial osmótico; dificulta o desenvolvimento de bactérias indesejáveis principalmente clostrídios e permite a dominância de bactérias homofermentativas láticas; possibilitando um rápido declínio do pH e menor extensão da fermentação (Woolford; 1984); | |
DOI : 10.1590/S1516-35982005000300004 | |
学科分类:兽医学 | |
来源: Universidade Federal de Vicosa | |
【 摘 要 】
The present trial aimed to study the effects of forage wilting or the addition fibrolytic enzymes to the Tanzaniagrass (Panicum maximum Jacq. cv. Tanzania) during the ensiling process or after the silage unloading and before animal feeding. The fermentation and ruminal kinetics parameters, animal ingestive behavior, dry matter intake and in vivo nutrient digestibilities in bovine were measured. Treatments consisted of forage ensiling as described: A - wilted forage without enzymes; B - fresh forage without enzymes; C - wilted forage with enzymes at ensiling (2 L/t wet forage); D - fresh forage with enzymes at ensiling; E - enzymes applied into silage (10 L/t wet silage) 30 minutes before feeding (direct-fed). Silage samples were submitted to chemical analysis and screened for particle size measurements. Five ruminally cannulated Nellore steers were randomly assigned to a 5 x 5 Latin square design and fed with 50% silage total mixed rations diets. The ruminal passage rate of solid (2.23%/hour) and liquid (4.83%/hour) phases were similar for all treatments. The molar concentration (109.62 mM) of total VFAs and ammonia-N (5.6 mg/dL) observed in ruminal fluid were similar across silages diets. The forage wilting determined lower C2:C3 ration in the rumen. The animal ingestive behavior measured as total time (minutes/day) and rate (minutes/DM kg) was not changed with enzymes application, averaging DM eating (247; 24), DM ruminating (426; 43) and DM chewing (673; 67), respectively. Rations containing wilted silages showed less rumination and chewing. The mean DM (47.5 vs. 53.6%), NDF (45.8 vs. 55%) and ADF (45.5 vs. 54.8%) digestibilities were decreased on total mixed rations containing wilted silages. The wilting of Tanzaniagrass or the addition of fibrolytic enzymes resulted in marginal improvement, both in the ruminal parameters or animal ingestive behavior.
【 授权许可】
CC BY-NC
【 预 览 】
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