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Objetivou-se com este trabalho estimar a composição corporal e as exigências nutricionais em proteína e energia para ganho de peso de cabritos ½ Boer ½ SRD, na fase de crescimento, em pastejo na região semiárida. O experimento foi desenvolvido na fazenda ‘Nupeárido’, no município de Patos, Paraíba. Foram utilizados 24 cabritos com peso corporal médio inicial de 15 kg, em pastejo, distribuídos em quatro tratamentos com níveis crescentes de suplementação concentrada (0; 0,5; 1,0 e 1,5% do peso corporal). Os animais, mantidos em sistema de semiconfinamento, receberam suplementação alimentar, em baias individuais, ao serem recolhidos diariamente. Quando um dos animais de cada grupo atingia 30 kg de peso corporal, todos os demais animais do grupo eram abatidos após jejum de 16h. A composição corporal variou de 185,3 a 184,0 g de proteína; 53,0 a 120,2 g de gordura e 1.642 a 2.356 kcal kg-1 de corpo vazio. As exigências líquidas em proteína e energia variaram de 146 a 145 mg e 1,92 a 2,75 kcal g-1 de ganho, respectivamente, para animais de 15 a 30 kg de peso corporal. The objective of this work was to estimate the body composition and the nutritional requirements in protein and energy for the weight gain of ½ Boer and ½ Mixed-breed goat kids, during growth phase, on pasture in the semi-arid region. The work was developed at ‘Nupeárido’ farm, in Patos- PB. Twenty-four goat kids were used, with average initial body weigh of 15 kg, distributed into four treatments with increasing levels of concentrate supplementation (0, 0.5, 1.0 and 1.5% of body weight). The animals, maintained under semiconfinement system, received feeding supplementation in individual stalls when they were gathered daily. Whenever one of the animals of each group reached 30 kg of body weigh, all other animals of the group were slaughtered after a 16-hour fast. The body composition varied from 185.3 to 184.0 g of protein; 53.0 to 120.2 g of fat and 1,642 to 2,356 kcal kg-1 of empty body. The net requirements in protein and energy on growing varied from 146 to 145 mg and 1.92 to 2.75 kcal g-1 of gain, respectively, for animals from 15 to 30 kg of body weigh

Composição corporal, exigências em proteína e energia para ganho de peso de caprinos em pastejo