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Este trabalho foi conduzido com o objetivo de avaliar as exigências de proteína, energia e macrominerais de bezerros nelores do nascimento aos 180 dias. Foram utilizados 20 bezerros (10 machos e 10 fêmeas) com peso corporal médio de 30±3 kg. Imediatamente após o nascimento, quatro bezerros, dois machos e duas fêmeas, foram abatidos para estimar a composição corporal inicial dos animais restantes no experimento. Aos 90 dias, foram abatidos oito bezerros (quatro machos e quatro fêmeas), o restante dos animais abatidos aos 180 dias. Além do leite, os bezerros foram alimentados com silagem de milho à vontade e concentrado comercial fixado em no máximo 0,5 kg/animal/dia. Foram conduzidos dois ensaios de digestibilidade, aos 30 e 90 dias para estimar os consumos de energia dos bezerros. Após o abate, todos os bezerros tiveram suas meias-carcaças direitas dissecadas. Os conteúdos corporais de proteína, energia e minerais foram estimados pela equação Y = a . PCVZb, sendo PCVZ o peso de corpo vazio. A relação PCVZ/PC dos bezerros foi de 0,9622 e a de ganho (G) de PCVZ/GPC foi de 0,958. As exigências líquidas de proteína e energia aumentaram com o aumento do peso corporal, enquanto as de cálcio diminuíram. As exigências de proteína metabolizável para ganho de 1 kg de PC foram de 216,96 e 261,98 g para bezerros de 100 e 200 kg, respectivamente. Recomenda-se utilizar as seguintes equações para estimar os conteúdos corporais de bezerros Nelore lactentes: proteína (g/dia) = 0,135 × PCVZ1,0351; energia (Mcal/dia) = 1,1798 × PCVZ1,1805; cálcio (g/dia) = 0,091 × PCVZ0,6019; fósforo (g/dia) = 0,00894 × PCVZ0,9629; sódio (g/dia) = 0,00126 × PCVZ0,9791; magnésio (g/dia) = 0,000405 × PCVZ0,9827; potássio (g/dia) = 0,00165 × PCVZ0,9364. This experiment was carried out to evaluate the nutritional requirements of protein, energy and macro minerals for Nellore calves from birth to 180 days. A total of 20 calves, 10 males (M) and 10 females (F) with average body weight (BW) of 30±3 kg were used. Soon after birth, four (2 males and 2 females) calves were slaughtered to estimate initial body composition of animals that remained in the trial. At 90 days, another eight calves were slaughtered (4 males and 4 females), and the remaining animals were slaughtered at 180 days. Besides milk, the calves were fed with corn silage ad libitum and commercial concentrate set at a maximum of 0.5 kg/animal/day. Two digestibility assay were conducted at 30 and 90 days to estimate the energy intake of the calves. After slaughtered all calves had their right half-carcasses dissected. The content of protein, energy and minerals were estimated by the equation Y = a. EBWb, where EBW is the empty body weight. The relationship EBW/BW of calves was 0.9622 and EBWG/BWG was 0.958, where G is the gain. The net requirements of protein and energy increased with increasing body weight, while calcium decreased. The metabolizable protein requirements for gain of 1 kg BW were 216.96 and 261.98 g for calves with 100 and 200 kg respectively. The following equations are recommended to estimate the body content of preweaning Nellore calves: protein (g/day) = 0.135 × EBW1.0351; energy (Mcal/day) = 1.1798 × EBW1.1805; calcium (g/day) = 0.091 × EBW0.6019; phosphorus (g/day) = 0.00894 × EBW0.9629; sodium (g/day) = 0.00126 × EBW0.9791; magnesium (g/day) = 0.000405 × EBW0.9827; potassium (g/day) = 0.00165 × EBW0.9364

Exigências nutricionais de bezerros nelores lactentes