Efeitos de dietas com polpa cítrica em substituição ao milho em grãos no concentrado sobre a degradabilidade e a fauna ruminal em bubalinos
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Data
2000-11-01
Autores
Franzolin Neto, Raul
Franzolin, Maria Helena Tieghi
Gomide, Catarina Abdalla [UNESP]
Schalch, Edison
Silva, Juliano Roberto da
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Revista Brasileira de Zootecnia - Brazilian Journal of Animal Science
Resumo
Quatro búfalos com cânulas ruminais foram distribuídos aleatoriamente em quadrado latino 4 x 4, compreendendo quatro rações com feno de capim-coastcross (Cynodon dactylon) (50% MS) e níveis crescentes de polpa cítrica peletizada em substituição ao milho em grão moído no concentrado (0, 33, 66 e 100% MS). Foram avaliadas a degradabilidade dos nutrientes e a população de protozoários no rúmen. Houve efeito quadrático da fração solúvel dos nutrientes entre os tratamentos, com valores maiores nos dois extremos. A taxa de degradação da PB do feno e da MS da polpa cítrica apresentou-se linear com aumento da polpa cítrica na ração. As rações contendo polpa cítrica promoveram menores concentrações de Entodinium e número total de ciliados/mL que a dieta só com milho. Houve predominância dos Entodinium nas dietas contendo somente milho ou somente polpa cítrica, enquanto em mistura predominaram os ciliados da subfamília Diplodiniinae. Observou-se efeito de interação da polpa cítrica com o milho, promovendo modificações no metabolismo ruminal, especialmente na solubilidade dos nutrientes, na curva do pH e na composição da fauna.
Four buffaloes with rumen cannula were distributed in a 4 x 4 Latin Square design with four diets composed by coast cross grass (Cynodon dactylon) hay (50% DM) and increasing levels of citrus pulp in substitution of corn grain in the concentrate (0; 33; 66 and 100%). The nutrient degradability and rumen protozoa population were evaluated, There was a quadratic effect on the soluble fraction of the nutrients among the treatments with higher values in the two ends. The hay CP and citrus pulp DM degradation rate was linear as the levels of citrus pulp in the diet increased. The diets containing citrus pulp promoted lower concentrations of Entodinium and total number of ciliates/mL than the diet with corn grain alone. There was predominance of the Entodinium in the diets with only corn grain or only citric pulp while in mixture prevailed the ciliates of the subfamily Diplodiniinae. Effect of interaction of citrus with the corn pulp was observed, promoting modifications in the ruminal metabolism, especially in the nutrient solubility, in the pH curve and in the rumen fauna composition.
Four buffaloes with rumen cannula were distributed in a 4 x 4 Latin Square design with four diets composed by coast cross grass (Cynodon dactylon) hay (50% DM) and increasing levels of citrus pulp in substitution of corn grain in the concentrate (0; 33; 66 and 100%). The nutrient degradability and rumen protozoa population were evaluated, There was a quadratic effect on the soluble fraction of the nutrients among the treatments with higher values in the two ends. The hay CP and citrus pulp DM degradation rate was linear as the levels of citrus pulp in the diet increased. The diets containing citrus pulp promoted lower concentrations of Entodinium and total number of ciliates/mL than the diet with corn grain alone. There was predominance of the Entodinium in the diets with only corn grain or only citric pulp while in mixture prevailed the ciliates of the subfamily Diplodiniinae. Effect of interaction of citrus with the corn pulp was observed, promoting modifications in the ruminal metabolism, especially in the nutrient solubility, in the pH curve and in the rumen fauna composition.
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Palavras-chave
Búfalo, Degradabilidade, Polpa cítrica, Protozoários rúmen, Buffalo, Citrus pulp, Degradability, Rumen protozoa
Como citar
Revista Brasileira de Zootecnia - Brazilian Journal of Animal Science. Viçosa-MG: Revista Brasileira de Zootecnia - Brazilian Journal of Animal Science, v. 29, n. 6, p. 2109-2118, 2000.