Mandioca e farelo da vagem de algaroba na alimentação de caprinos mestiços

Abstract

This trial was carried out to evaluatecthe effects of the cassava and mesquite pod meal (MPM) in the feeding of crossbred goats, through the determination intake, nutrient digestibility, nitrogen balance(NB), performance and carcass yield. The experiments were conducted in the Department of Animal Metabolism of Embrapa Semiarid. In the first trial evaluated the proportions (0, 20, 40 and 60%) of concentrate in diets containing cassava stem foliage silage (CSFS), according to NRC (2007), using 20 crossbred goats, castrate, with average weight of 17kg, distributed in a completely randomized design for a period of 25 days. In both trials, data were analyzed by analysis of variance and regression using the program SISVAR (2005). In the first experiment, the addition of concentrates to the diet did not affect (P>0.05) intake (g/day, %BW, g/UTM) of dry matter (DM), crude protein (CP), organic matter (OM) and mineral matter (MM), where the ethereal extract (EE) were significant (P<0.05) showing a linear decrease, observing the same result for the neutral detergent fiber (NDF) and acid detergent fiber (ADF) in %BW and g/UTM. The intakes (g/day, %BW and g/UTM) non-fibrous carbohydrates (NFC) showed an increasing linear effect (P<0.05). The digestibility coefficients were not significant (P>0.05) with the addition of concentrated diets. The NB, even though positive was not significantly different (P>0.05). In a second experiment aimed to evaluate the substitution of scrapings cassava (SC) by MPM levels of 0.00, 24.00, 48.48 and 71.30%, the performance of goats. The animals had 21.6kg of body weight, feed CSFS and concentrated in 50:50. The intake DM was not affected (P>0.05), despite the intake of NDF, ADF and CP in g/day were significant (P<0.05). No effects were significant (P>0.05) in weight gain (average and total) with the inclusion of MPM in the diets, as well as in non-carcass components (blood, skin, head, heart, kidney, liver, gastrointestinal tract empty). The hot carcass yield (HCY) and cold carcass yield (CCY) showed decreasing effect (P<0.05) in the levels of substitution, however, the full weight of the digestive tract showed increased linearly (P<0.05). The external length of the housing (ELH) and internal (ILC) showed a linear increasing (P<0.05).