Comportamento alimentar, perfil metabólico, produção e composição do leite de vacas suplementadas com produto fibrolítico derivado da fermentação de fungos

Abstract

The use of exogenous fibrolytic enzymes as supplementation in the diet of ruminants has been alternative to improve the use of nutrients by animals and consequently improve their productive performance. The aim of this study was to evaluate the effect of supplementing a dried fungi fermentation product expressing residual fibrolytic enzymatic activity (MAXFIBER®, Provita Supplements, Pinneberg/Germany), on digestibility, feeding behavior, productive performance and quality of milk and metabolic profile of high production dairy cows. Thirty-six multiparous Holstein cows were divided into two groups: Control group (GC; n = 18) that received a diet to meet their needs according to NRC 2001, and supplemented group (GS; n = 18), which received the same control diet plus 10 g of the product with fibrolytic enzyme activity directly on the diet during a 23-day experimental period. Milk production was evaluated daily and milk and blood samples were collected on days 0, 14, 19 and 23 of the experimental period to evaluate the composition and quality of milk and to evaluate blood metabolites (albumin, urea, total proteins (PPT) βhydroxybutyrate (BHBA), non-esterified fatty acids (AGNE) and glucose) respectively. Consumption and eating behavior were assessed daily using automatic troughs (Intergado®). Cows that received a diet supplemented with enzymes showed higher milk production, producing 1 kg more, less CCS in milk (p = 0.003), with 97,000 CCS / mL less in milk and less (p = 0,01) percentage of fat in milk. In the assessment of eating behavior, the treatment had no significant effect on DM consumption and diet digestibility, but increased the frequency of access to troughs and the frequency of meals (p = 0.001). Supplementation with the product with enzymatic activity did not affect the concentrations of albumin, urea, PPT, AGNE and BHBA, but tended to increase blood glucose (p = 0.09). Supplementation of the fungal fermentation product with fibrolytic enzyme activity in the diet of multiparous dairy cows was effective in increasing milk production, presenting benefits to the mammary gland immunity by reducing CCS in milk, in addition to altering feeding behavior, increasing the frequency consumption, without changing the metabolic profile of these animals.