Caracterização e digestibilidade dos farelos fino e grosso de trigo

Abstract

The objective of this work was to evaluate chemical composition and digestibility of the fine and rough wheat bran. Samples of the food were analyzed for granulometry, water absorption and retention capacity, pH, matter dry (DM), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin (LIG), total carbohydrates (TCH) and no fiber carbohydrates (NFC), nitrogen fractions (A,B1, B2, B3 and C). Six male, non-castrated goats, 22 Kg live weight individually held in metabolism cages were used to evaluate the digestibility. The animals were fed Tifton hay (Cynodon dactylon) and fine or rough wheat bran (50:50 and 80:20 for fine wheat bran, and 60:40 e 70:30 for hough wheat bran). The equation system was used to determine the digestibility coefficients. Both wheat bran have similar pH, water absorption and retention capacity, and differ in particles granulometry. In fine wheat bran 99.3% of the particles are smaller than 1.18 mm, while in the rough one 31.3% are smaller and 68.4% are larger than 1.18 mm. The chemical composition was similar, except for CP, higher in the fine wheat bran (18.2 x 15.85%), NDF and ADF, higher in rough wheat bran (53.29 and 48.22% x 42.72 and 38.07%). Nitrogen fractions B2 and C were, respectively, 45% and 6% for bothwheat bran. The digestibility coefficients of DM, OM, CP, EE, TCHO, NDF, NDFcp, hemicellulose and cellulose were, respectively, 61.33, 68.62, 76.22, 70.00, 67.32, 66.78,65.75, 72.95, and 68.39% for rough wheat bran and 57.95, 60.36, 63.82, 59.29, 59.84, 56.92, 56.35, 65.23 and 58.56%. Fine and rough wheat bran can be used as an alternative food for goats feeding.