03828naa a2200265 a 450000100080000000500110000800800410001902400590006010000210011924501040014026000090024452029630025365000220321665000100323865300260324865300260327465300140330070000290331470000220334370000230336570000230338870000220341170000170343377301120345015318692018-01-05       2005    bl uuuu     u00u1 u    #d7 ahttp://dx.doi.org/10.1590/S1516-359820050007000332DOI1 aGONZAGA NETO, S.  aComposição corporal e exigências nutricionais de proteína e energia para cordeiros Morada Nova.  c2005  aEste trabalho foi realizado objetivando-se determinar a composiçao corporal de proteina, gordura e energia e as exigencias nutricionais de proteins e energia para mantença e ganho de peso de ovinos Morada Nova. Foram utilizados 30 cordeiros com peso vivo (PV) medio inicial de 15 kg. Para determinaçao da composiçao corporal, pela metodologia do abate comparativo, seis cordeiros (animais- referencia) foram abatidos aos 15 kg, seis aos 20 kg (abate intermediario) e os demais foram distribuidos em seis grupos (um para cada dieta) de tres animais, de acordo com a relaçao volumoso(V):concentrado(C): 40:60, 55:45 e 70:30. os cordeiros em cada grupo foram abatidos quando o que recebia a dieta com maior teor de concentrado atingiu 25 kg de PV. A composiçao corporal variou de 181,53 a 178,74 g de proteina; 72,37 a 131,11 g de gordura e 1,81 a 2,34 Mcal de energia por kg de peso de corpo vazio (PCV). As exigencias liquidas de ganho variaram de 222,30 a 218,6 g de proteina e de 3,30 a 4,28 Mcal de energia por kg de PV ganho. As perdas endogenas de nitrogenio foram de 0,332 g/kgO,75/dia. A exigencia liquida de energia para mantença, estimada pela produçao de calor em jejum, foi de 52,49 kcal kg O,75 de PCV. As exigencias de proteina e energia metabolizavel para cordeiros dos 15 aos 25 kg de PV, com ganho de peso diario de 100 g, oscilaram de 53,46 a 60,19 g/dia e de 1,47 a 2,00 Mcal/dia, respectivamente.   [Body composition and nutritional requirements of protein and energy for Morada Nova lambs].  Abstract: This investigation was carried out to determine body composition of protein, fat, and energy as well as nutritional requirements of protein and energy for maintenance and weight gain of Morada Nova Lambs. Thirty lambs averaging 15 kg of initial body weight (BW) were used in this trial. To determine the body composition using the comparative slaughter approach six lambs were slaughtered at 15 kg (reference animals), six at 20 kg (intermediary slaughter), and the remaining were distributed in one of six groups of three animals (one animal per diet) receiving the following forage (F):concentrate(C) ratios: 1) 40F:60C; 2) 55F:45C, and 3) 70F:30C. Lambs in each group were slaughtered when the animal fed the highest amount of concentrate reached 25 kg of BW. Body composition varied from 181.53 to 178.74 g of protein, 72.37 to 131.11 g of fat, and 1.81 to 2.34 Mcal of energy per kg of empty body weight (EBW). The net requirements of gain varied from 222.30 to 218.6 g of protein and from 3.30 to 4.28 Mcal of energy per kg of gained BW. The endogenous losses of nitrogen were of 0.332 g/kg0.75/day. The net requirement of energy for maintenance, estimated by heat production in fasted animals, was of 52.49 Kcal/kg0.75 of EBW. The requirements of metabolizable protein and energy for lambs from 15 to 25 kg of BW with daily weight gain of 100 g varied from 53.46 to 60.19 g/day and from 1.47 a 2.00 Mcal/day, respectively.  aNutrição Animal  aOvino  aComposição corporal  aExigência nuticional  aMantença1 aSILVA SOBRINHO, A. G. da1 aRESENDE, K. T. de1 aZEOLA, N. M. B. L.1 aSILVA, A. M. de A.1 aMARQUES, C. A. T.1 aLEÃO, A. G.  tRevista Brasileira de Zootecnia, Viçosa, MGgv. 34, n. 6, supl., p. 2346-2456, nov./dez. 2005. Suplemento.