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首页> 外文期刊>Tropical Animal Health and Production >Nutritional strategies for heifers under grazing system: productive and nutritional performance, metabolic profile and ovarian activity
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Nutritional strategies for heifers under grazing system: productive and nutritional performance, metabolic profile and ovarian activity

机译：放牧制度下的小母牛的营养策略：生产性和营养性能，代谢概况和卵巢活动

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The objective of this study was to evaluate the effects of nutritional strategies on productive and nutritional performance, metabolic profile, and ovarian activity in heifers under grazing in the tropics in Brazil. Forty Nellore heifers averaging 8.5 +/- 0.06 months and 248.6 +/- 3.3 kg body weight (BW) were distributed in a completely randomized 2 x 2 factorial design with four treatments and ten replicates. The evaluated strategies consisted of different amounts of energetic-protein supplement: (1) 4 g/kg of BW of supplement in the pre-weaning and post-weaning; (2) 4 g/kg of BW of supplement pre-weaning and 6 g/kg in the post-weaning; (3) 6 g/kg of BW of supplement in the pre-weaning and 4 g/kg of BW in the post-weaning and; (4) 6 g/kg of BW of supplement in the pre-weaning and post-weaning. Crude protein (CP) and organic matter (OM) intake were increased (P < 0.05) by increasing the amounts of supplement in the post-weaning. Additionally, increasing supplement amounts in the post-weaning increased the digestibility of OM and CP (P < 0.05). Means insulin and glucose concentrations were greater (P < 0.05) for heifers that received higher amounts of supplement in the post-weaning. Average daily gain and fat thickness in the rump were increased (P < 0.05) by increasing supplement amounts in the post-weaning. Amounts of supplement did not influence the body growth of heifers. However, follicular number, diameter, and progesterone concentration were greater (P < 0.05) for heifers that received higher amounts of supplement in the post-weaning. In summary, increasing supplement amounts in the post-weaning improve the performance, energy and metabolic status, and ovarian activity in beef heifers under grazing in the tropics. Due to higher intake of supplement, the heifers receiving 6 g/kg of BW post-weaning had greater responses, independently of the supplement amount received pre-weaning.
机译：本研究的目的是评估营养策略对巴西热带地区养成的营养和营养性能，代谢外形和卵巢活动的影响。四十个小母牛平均8.5 +/- 0.06个月和248.6 +/- 3.3千克体重（BW）分布在一个完全随机的2 x 2因子设计中，有四个治疗和十个重复。评价策略由不同量的能量 - 蛋白质补充剂组成：（1）预防和断奶后补充剂的4克/千克; （2）4克/千克补充剂预防预防预防和6克/千克的后断奶; （3）6克/千克BW的补充剂，在断奶后的预防和4克/千克BW和; （4）6克/千克补充剂预防和断奶后的BW。通过增加断奶后补充剂的量增加（P <0.05），增加粗蛋白（CP）和有机物质（OM）。此外，在断奶后增加补充量增加了OM和CP的消化率（P <0.05）。意味着胰岛素和葡萄糖浓度更大（P <0.05），用于接受后断奶率较高量的补充剂。通过增加后断奶中的补充量增加臀部的平均每日增益和脂肪厚度增加（P <0.05）。补充剂的数量没有影响小母牛的身体生长。然而，对于在断奶后接受较高量的补充剂的小母牛，卵泡数，直径和孕酮浓度更大（P <0.05）。总之，在断奶后提高补充金额可以提高在热带地区放牧的牛仔猎犬的性能，能量和代谢状态，以及卵巢活动。由于补充剂的摄入量更高，接收6克/千克BW后断奶后的继承者具有更大的反应，独立于接受预先发生的补充金额。

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