肉鸡的空腹产热与机体组成有关

D.A. Martinez, N. Suesuttajit, K. Hilton , J.T. Weil, C. Umberson, A. Scott, C.N. Coon
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引用次数: 5

摘要

空腹产热(FHP);维持状态下的净能量消耗是确定饲料净能值的关键值,由呼吸室测量计算或作为代谢体重(MBW)的函数预测。本研究旨在通过建模方法确定体成分对肉鸡FHP的影响。通过6个实验(Exp 1-6)建立(Exp 1-4)和外部验证(Exp 5和6)预测模型。在试验1-4中,采用3种饲粮处理方式诱导单株地板栏肉鸡体成分的差异。FHP(量热室)和体蛋白脂肪比(PFR;在7 ~ 55天的9个时间点记录双能x线吸收仪。调整线性模型(考虑笔作为实验单元),从包含MBW作为唯一预测器的模型开始。通过包括PFR和鸟的年龄来测试进一步的修改。采用随机分裂和修正方法。对四个模型进行内部验证并对整个数据进行修正。他们认为FHP是MBW(或BW)和PFR的函数,包括或不包括鸟类的年龄,并且显示出很高的精度(R2 >0.98)和精度(误差<2.5%)。所有模型均表明,相同体重和年龄的禽类越瘦,FHP越高。体蛋白和脂肪分别与FHP呈正相关和负相关。试验5分别在22日龄和41日龄对2个遗传系饲喂3种饲粮处理的肉仔鸡进行FHP和体成分测定。试验6:分别在第17、20和41天,按剂量效应设计连续饲喂饲粮,测定肉鸡的FHP和体成分。以处理为验证单元,用Exp 5和Exp 6的数据对模型进行检验。所选模型预测精度较高(验证R2 >0.92)和精度(模型预测误差<3%),并进行外部验证。综上所述,在相同年龄和体重下,PFR越高,FHP越高。PFR的加入提高了模型的强度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The fasting heat production of broilers is a function of their body composition

The fasting heat production (FHP; net energy expenditure under maintenance) is a key value to determine the net energy value of the feed and is calculated from measurements in respiratory chambers or predicted as a function of the metabolic BW (MBW). This study aimed to determine the influence of body composition on the FHP of broilers through a modeling approach. Six experiments (Exp 1–6) were conducted to develop (Exp 1–4) and externally validate (Exp 5 and 6) predictive models. In Exp 1–4, broilers of a single genetic line in floor pens were subjected to three dietary treatments to induce differences in body composition. The FHP (calorimetry chambers) and the body protein-to-fat ratio (PFR; Dual-Energy X-ray Absorptiometry) were recorded at nine time points between 7 and 55 days. Linear models were adjusted (considering the pen as the experimental unit), starting with a model containing the MBW as the sole predictor. Further modifications were tested by including the PFR and the age of the birds. A random split with a refitting approach was applied. Four models were internally validated and refitted to the whole data. They considered the FHP a function of the MBW (or BW) and the PFR, including or not the age of the birds, and showed high precision (R2 > 0.98) and accuracy (error < 2.5%). All models demonstrated that birds at the same BW and age have higher FHP the leaner they are. Body protein and fat are positively and negatively correlated to FHP, respectively. In Exp 5, broilers of two genetic lines fed three dietary treatments were tested for FHP and body composition at 22 and 41 days. In Exp 6, broilers fed continuous dietary treatments in a dose–response design were tested for FHP and body composition at 17, 20, and 41 days. The models were tested on the data from Exp 5 and 6 considering the treatments as the validation unit. The four selected models showed high prediction precision (validation R2 > 0.92) and accuracy (model prediction error < 3%) and were validated externally. In conclusion, at the same age and BW, the higher the PFR, the higher the FHP. Including the PFR improved the strength of the models.

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