Estudo comparativo da proteína do feno de maniçoba em relação à proteína do feno de alfafa na ração de coelhos

Abstract

Two experiments were conducted in order to assess the nutritional value of hay maniçoba (FM) compared with alfalfa hay (FA) as an ingredient in the diet of growing rabbits-finish. In experiment 1 were determined digestibilities of dry matter (DMD), crude protein (CPD), ether extract (DEE) and digestible energy (DE) was analyzed. 14 rabbits were used in growth, delivered in a completely randomized design with seven replications. FM presented at natural matter, 67.40% of DMS, 35.05% of BDP, 11.87% of DEE and 709 kcal DE / kg. In experiment 2, we used 56 rabbits (28 castrated males and 28 females) to evaluate the growth performance parameters, and carcass and meat composition. We evaluated increasing levels of replacement of the FA PB by PB FM at 0, 25, 50 and 75%. The experimental design was a completely randomized design with four treatments and seven replications, and housed two animals per experimental unit. The data were analyzed using the SAS program. Feed intake increased linearly as weight gain, feed conversion, live weight, hot carcass weights and cold and weight of the skin had a quadratic effect with maximum levels of substitution of crude protein (CP) of the FA protein of FM of respectively 58, 34.9, 54, 50, 50 and 50% respectively. The results of carcass composition showed that the percentage of CP increased to 31.6%, the ability to retain water up to 36.7%, while the fat percentage peaked in the substrate with 46.5% replacement of CP FA by PB FM. There was no effect of treatments on the levels of oleic fatty acids, lauric and palmitic acids in the muscle biceps femoris. Hay maniçoba contains 14.89% protein, 67.4% of DMS and 709 kcal DE / kg in MN. It is recommended to replace 58% of the FA PB by PB FM, with the additions of 14.33 kg of FM and 8.78 kg of FA/100 kg.