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Performance, growth, and maturity of Nellore bulls

机译：内洛尔公牛的表现，成长和成熟

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The objectives of this study were to evaluate the dry matter intake (DMI), digestibility, average daily gain (ADG), microbial efficiency, empty body weight (EBW) gain, and body composition of Nellore bulls. Additionally, Nellore bull maturity was estimated, and the prediction equation for DMI, suggested by the Brazilian nutrient requirements system (BR CORTE; Azevdo et al. 2010), was evaluated. Thirty-three Nellore bulls, with a mean initial weight of 259 +/- 25 kg and age of 14 +/- 1 months, were used in this study. Five animals were slaughtered at the beginning of the experiment (control group), and the remaining 28 were divided into 4 groups, each slaughtered at 42-day intervals. Their diet was composed of corn silage and concentrate (55:45). The power model was used to estimate muscle tissue, bone tissue, crude protein (CP), mineral matter (MM), and water present in the empty body, while the exponential model was used to estimate adipose tissue and ether extract (EE) present in the empty body. When expressed in kilograms per day, differences were observed (P < 0.05) only for the intake of EE and neutral detergent fiber as a function of feedlot time periods. Although there was a difference in relation to nutrient intake, it did not affect (P > 0.05) digestibility, with the exception of EE digestibility. The equation suggested by BR CORTE correctly estimates the DMI of Nellore bulls. ADG was not affected (P > 0.05) by time spent in the feedlot. No differences were observed (P > 0.05) for microbial efficiency; a mean value of 142 g microbial crude protein/kg total digestible nutrients was achieved. The muscle and bone tissues, CP, MM, and water present in the empty body increased as the animal grew, although at a lower rate. The adipose tissue and EE present in the empty body increased their deposition rate when the animal reached its mature weight. Maturity is defined as when an animal reaches 22 % EE in the empty body, which corresponds to 456 kg of EBW in Nellore bulls. Therefore, this study can conclude that the feedlot time period does not affect DMI, nutrient intake, ADG, or microbial efficiency. The equation proposed by BR CORTE (Azevdo et al. 2010) correctly estimates the DMI of Nellore bulls, which reach maturity when an EBW of 456 kg is attained.
机译：这项研究的目的是评估内洛公牛的干物质摄入量（DMI），消化率，平均日增重（ADG），微生物效率，空体重（EBW）增重和身体组成。此外，还估算了内洛尔牛市的成熟度，并评估了巴西养分需求系统（BR CORTE; Azevdo等人2010）建议的DMI预测方程。该研究使用了33头内洛公牛，平均初始体重为259 +/- 25公斤，年龄为14 +/- 1个月。在实验开始时宰杀了五只动物（对照组），其余的28只被分为4组，每组以42天为间隔被宰杀。他们的饮食包括玉米青贮饲料和浓缩饲料（55:45）。功效模型用于估计肌肉组织，骨骼组织，粗蛋白（CP），矿物质（MM）和空体内存在的水，而指数模型用于估计存在的脂肪组织和乙醚提取物（EE）在空的身体。当以千克/天表示时，仅EE和中性洗涤剂纤维的摄入量随饲喂时间的不同而观察到差异（P <0.05）。尽管营养摄入量存在差异，但除EE消化率外，它不影响（P> 0.05）消化率。 BR CORTE建议的方程可正确估算内洛尔公牛的DMI。饲喂时间对ADG没有影响（P> 0.05）。微生物效率没有差异（P> 0.05）;达到142 g微生物粗蛋白/ kg总可消化营养素的平均值。空腹体内的肌肉和骨骼组织，CP，MM和水会随着动物的成长而增加，尽管比率较低。当动物达到其成熟体重时，空体内存在的脂肪组织和EE会增加其沉积速率。成熟度的定义是，动物在空体内达到EE的22％时，相当于内洛尔公牛的456千克EBW。因此，这项研究可以得出结论，育肥场时间段不会影响DMI，营养摄入，ADG或微生物效率。 BR CORTE提出的方程式（Azevdo等人，2010年）正确估算了内洛尔公牛的DMI，当达到456 kg的EBW时，它们的成熟度就达到了。

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