Níveis de inclusão do coproduto da vitivinificação associado ao zinco na dieta de ovinos

Abstract

The wine industry of the by product is a bulky food alternative, but has high levels of the micro mineral copper. Sheep fed diet rich in Cu may present cumulative copper poisoning. The objectives of this study were to evaluate the by product of the inclusion levels of vinification replacing hay in diet and efficacy of zinc to prevent copper poisoning in sheep. They were used to study 34 female crossbred lambs of Texel and Corriedale breeds. The experimental design was a randomized block, animals were divided into 4 groups of 2 reps. The treatments consisted of four hay replacement levels of Jiggs (Cynodon dactlylum) by product of wine production in dry matter (DM), they were: Control Group (CG): basal diet + 0% of by product in DM; Treat 1: basal diet + 10% of by product in DM; Treat 2: basal diet + 20% of by product in DM; Treat 3: basal diet + 30% by product in DM. Diets were adjusted to present the same relationship Zn 6:1 Cu basal diet. Weekly was held individual weighing of animals and collecting blood of lambs to the following chemistries: PPT, albumin, AST, GGT, glucose and total and direct bilirubin. Consumption of by product by 30% in the hay substitution contributed to the similar weight gain between treatments (P = 0.92) and suitable for the animal category. The increase in copper in the diet showed a linear effect (P <0.01) in values of GGT and AST enzyme, total bilirubin (P < 0.05) and the group with the highest dietary copper level also showed higher consumption (P < 0.01). The replacement of the by product of hay vitivinificação and up to 30% DM it was demonstrated satisfactory and did not negatively affect consumption and growing lambs gain weight. Supplementation with zinc sulfate in diets based on the by product of vinification for sheep, is not effective for the prevention of liver damage resulting from absorption of copper for a period of 70 days of use.