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首页> 外文期刊>Tropical Animal Health and Production >Energy and protein requirements of non-descript breed hair lambs of different sex classes in the semiarid region of Brazil
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Energy and protein requirements of non-descript breed hair lambs of different sex classes in the semiarid region of Brazil

机译：巴西半干旱地区不同性别课程非描述性养殖羊羔的能量和蛋白质要求

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摘要

The aim of this study was to determine the energy and protein requirements of non-descript breed hair lambs (NDB) reared under Brazilian semiarid conditions. Sixty animals from three sex classes (20 intact males, 20 castrated males, and 20 females) with an average initial body weight of 18.1 +/- 0.4 kg and an average age of 5 months were used. The nutritional requirements were estimated using the comparative slaughter. The animals in the final slaughter group were distributed in a completely randomized design with a 3x3 factorial scheme (three sex classes and three feeding levels: ad libitum feeding (positive energy balance), 70% feed restriction (maintenance level), and 80% feed restriction (negative energy balance)). The net energy requirement for maintenance (NEm) did not differ between sex classes (P>0.05) and it was 68 kcal/kg of metabolic empty body weight (EBW0.75)/day (P< 0.05). The coefficients for the nonlinear regression of retained energy (RE) on the empty body weight gain (EBWG) were not different among the different sex classes (P> 0.05). The net energy requirement for weight gain (NEg) was estimated by NEg (Mcal/day) = 0.29xEBW(0.75)x EBWG(0.86) for all sex classes (P< 0.05). The net protein requirement for weight gain (NPg) was estimated by NPg (g/day)= 224.45xEBWG-0.025xRE for all sex classes (P < 0.05). The NEg increased and the NPg decreased with the increase in body weight of NDB lambs.
机译：本研究的目的是确定根据巴西半干旱条件下饲养的非描述性品种毛羔羊（NDB）的能量和蛋白质要求。使用了来自三种性别课程（20个完整的男性，20名阉割的男性和20名女性）的六十只动物，其平均初始体重为18.1 +/- 0.4千克和平均年龄为5个月。使用比较屠宰估计营养需求。最终屠宰组中的动物以完全随机的设计分发，具有3x3因子方案（三种性别课程和三个饲养水平：AD Libitum Feeding（正能量平衡），70％的饲料限制（维护水平）和80％饲料限制（负能量平衡））。维护（NEM）的净能量要求在性课（P> 0.05）之间没有差异，其是68 kcal / kg代谢空体重（EBW0.75）/天（P <0.05）。在空体重量增益（EBWG）上的保留能量（RE）的非线性回归的系数在不同的性别类别中没有不同（P> 0.05）。重量增益（NEG）的净能量要求由ENG（MCAL /日）估计为0.29xeBW（0.75）X EBWG（0.86），适用于所有性别课程（P <0.05）。重量增益（NPG）的净蛋白质要求估计NPG（G /天）= 224.45xeBwg-0.025xRe，适用于所有性别类别（P <0.05）。随着NDB羔羊体重的增加，NEN增加和NPG降低。

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