Resíduo da indústria de doces em associação à Protenose® na alimentação de pequenos ruminantes fistulados: consumo e digestibilidade

Abstract

The objective of this study was to evaluate the effect of different levels of residues from the candy industry in substitution of corn for the feeding of small ruminants, on consumption and apparent digestibility of dry matter and its components. The experiment was conducted at the Universidade Federal Rural de Pernambuco (UFRPE). Four male sheep and four male goats were studied, castrated and fistulated in the rumen, with average initial body weight of 71.9 kg and 64.85 kg, respectively, distributed in two contemporary 4x4 Latin squares. The experiment had a duration of 76 days, with four periods of 19 days each, being 12 days for adaptation to the experimental conditions and 7 days for data collection and sampling. The experimental diets were composed by Tifton 85 hay as forage; grounded corn, soybean bran, residues from the industries of candy, gum, powdered juice and derivatives in combination with corn gluten (Protenose ®) and mineral blend, as concentrated. The treatments consisted of inclusion of residues from the candy industry at levels of 0, 33, 66 and 100%. The variables were evaluated by analysis of variance and regression, using PROC MIXED and PROC REG of the SAS. Consumption of dry matter (DM), mineral matter (MM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), total carbohydrates (TCHO) and total digestible nutrients (TDN) were not influenced (P> 0.05) by the inclusion levels of residues from the candy factory in the diet, presenting averages of 874.89, 59.280, 815.61, 113.49, 345.20, 685.21 and 660.51g/day, respectively. In contrast, there was a significant effect on ethereal extract (EE) and non-fibrous carbohydrates (CNF) intake. The intake of EE was influenced (P <0.05) by dietary treatments, decreasing linearly as the sweet residue content increased. There was a quadratic effect on CNF intake as corn substitution was performed. Increasing levels of candy residues in the diets of small ruminants did not have an effect on the apparent digestibility of DM, OM, NDF and TCHO, with average values of 782.8, 792.2, 650.9 and 795.3g/kg, respectively. However, they favored an increasing linear effect on the apparent digestibility of CP and CNF and a linear decreasing effect on the apparent EE digestibility. Residues from the candy industry in association with Protenose® may replace up to 100% based on the dry matter of the diet of small ruminants, without adversely affecting the intake and apparent digestibility of the nutrients.