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Previous issue date: 2016 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) === Esta pesquisa foi realizada para determinar os efeitos da suplementa??o de feno de tifton-85 na dieta de milho gr?o inteiro e pellet comercial, sendo avaliados: os consumos de mat?ria seca e de nutrientes; a digestibilidade total aparente, a recupera??o do milho n?o degradado nas fezes e o comportamento ingestivo. O experimento foi conduzido no Setor de Nutri??o de Ruminantes da Fazenda Experimental Santa Paula da Universidade Federal dos Vales do Jequitinhonha e Mucuri, no munic?pio de Una?. O delineamento experimental adotado foi em quadrado latino, representado por quatro tratamentos (mistura 85% milho gr?o inteiro + 15% pellet comercial acrescido de n?veis de suplementa??o do feno de tifton-85 (0, 0,2, 0,4 e 0,8% do peso corporal), em quatro per?odos experimentais, com duas repeti??es (oito animais), resultando assim em dois quadrados latinos simult?neos. Para os consumos de mat?ria seca total (CMST), prote?na bruta total (CPBT), nutrientes digest?veis totais (CNDTT) e mat?ria mineral total (CMMT) n?o foi encontrada diferen?a (P>0,05) entre os tratamentos estudados. Foi observado efeito (P<0,05) apenas para o consumo de fibra insol?vel em detergente neutro total (CFDNT). Foi observado efeito significativo (P<0,05) para os consumos de: mat?ria seca do feno (CMSF), prote?na bruta do feno (CPBF), fibra em detergente neutro do feno (CFDNF) e mat?ria mineral do feno (CMMF) em fun??o dos n?veis de suplementa??o. Para as vari?veis referentes aos consumos de mat?ria seca e de nutrientes da mistura milho + pellet e consumo de feno em rela??o ao peso corporal (CMSF2) n?o houve efeito. Para as digestibilidades de mat?ria seca e nutrientes, n?o houve efeito (P>0,05) entre os tratamentos avaliados. Observou-se resposta linear decrescente (P<0,05) no percentual de milho recuperado nas fezes, entre os tratamentos avaliados, para as tr?s peneiras utilizadas, com diferentes crivos. Observou-se influ?ncia dos n?veis de feno (P<0,05) sobre os tempos despendidos pelos animais em alimenta??o (TAL), rumina??o (TRU) e mastiga??o total (TMT), j? o tempo despendido para o ?cio (TO) n?o foi influenciado pelos tratamentos. As vari?veis tempo mastiga??es por bolo (TM/bolo) e n?mero de mastiga??es por bolo (NM/bolo) n?o diferiram (P>0,05), j? o n?mero de mastiga??es dia (NM/dia) e n?mero de bolos ruminais (NBR) apresentaram diferen?a significativa (P<0,05). Foi observado efeito para as efici?ncias de alimenta??o (EALMS) e rumina??o (ERUMS) da mat?ria seca (P<0,05), enquanto que a efici?ncia de rumina??o da fibra em detergente neutro (ERUFDN) e taxa de rumina??o (TR), n?o tiveram efeito (P>0,05), entre os tratamentos estudados. Os n?veis suplementares de feno na dieta reduziram o percentual de milho nas fezes, proporcionou maiores tempos de rumina??o e mastiga??o. A dieta de milho e
pellet mostrou-se eficiente para a manuten??o do pH ruminal. === Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016. === This research was conducted in order to determine the effects of Tifton-85 hay supplementation in corn grain diet and commercial pellet in dry matter and nutrient intake; the apparent total tract digestibility of nutrients, the recovery of non-degraded corn in feces, and feeding behavior. The experiment was conducted in the Ruminant Nutrition Section of the Experimental Farm Santa Paula from Universidade Federal dos Vales do Jequitinhonha e Mucuri at Una? city. The experimental design was a Latin Square, represented by four treatments (mixture 85% corn grain + 15% commercial pellet plus levels of Tifton-85 hay supplementation (0, 0.2, 0.4, 0.8% of body weight)), in four experimental periods with two repetitions (eight animals), resulting in two simultaneous Latin squares. To the intake of total dry matter (ITDM), total crude protein (ITCP), total digestible nutrients (ITDN), and total mineral matter (ITMM) there was not significant difference (P > 0.05) between the treatments studied. It was observed an effect (P < 0.05) only for consumption of total insoluble fiber in total neutral detergent (TNDF). Significant effect was observed (P< 0.05) for the intake of: dry matter of hay (IDMH), crude protein of hay (ICPH), neutral detergent fiber of hay (INDFH), and mineral matter of hay (IMMH) in function of supplementation levels. For the variables related to the intake of dry matter and nutrients of the corn mixture + pellet and dry matter intake of hay in relation to body weight (IDMH2) there was no effect. There was not effect (P > 0.05) for the digestibility of dry matter and nutrient among the treatments. It was observed decreasing linear response (P < 0.05) in corn percentage recovered in feces between the treatments evaluated for the three sieves worked with different screens. There was influence of hay levels (P < 0.05) on the time spent by the animals in feeding (TFE), rumination (TRU), and total chewing time (TCT) but at the time spent on leisure (TL) there was not effect (P > 0.05). The variables chews time per bolus (CT/bolus), and number of chews per bolus (NC/bolus) did not differ between treatments (P > 0.05), but the number of chews per day (NC/day), and number of ruminal bolus (NRB) showed significant differences (P< 0.05). It was observed effect for feed efficiency (EFDM), and rumination (ERUDM) of dry matter (P < 0.05) while rumination efficiency of neutral detergent fiber (ERUNDF), and rumination rate (RR) had no effect (P > 0.05) among the treatments. The supplementary levels of hay in the diet reduced the percentage of corn in feces, and provided longer times of rumination and chewing. Corn grain and pellet diet is efficient in maintaining rumen pH.
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