Powell Christopher D, Ellis Jennifer L, Dias Raquel S, López Secundino, France James
Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
Trouw Nutrition, Puslinch, ON N0B 2J0, Canada.
Animals (Basel). 2022 Jun 22;12(13):1611. doi: 10.3390/ani12131611.
The ability of four non-linear mixed models and one linear mixed model to describe phosphorus (P) retention as a function of dietary P intake, expressed on an available P (avP) basis, was assessed in growing and finishing pigs. Of the four non-linear models, the monomolecular and Michaelis-Menten describe diminishing returns behaviour, while the Richards and Morgan describe sigmoidal behaviour with the ability to also describe diminishing returns. Using a meta-analysis approach, models were fitted to avP intake vs. P retention data from P balance studies. Pig bodyweights (BW) ranged from 43.5 to 133 kg, P intake ranged from 0.055 to 0.468 g kg BW d for avP, and 0.151 to 0.806 g kg BW d for total P, with P retention ranging from 0.026 to 0.329 g kg BW d. Models were evaluated using statistical measures of goodness-of-fit and inspection of residuals. The monomolecular and Michaelis-Menten best described the relationship between P retention and P intake. Endogenous P losses and P requirement for maintenance were found to be higher in finishing pigs compared to growing pigs as BW increased.
在生长育肥猪中评估了四种非线性混合模型和一种线性混合模型，以描述磷（P）潴留作为日粮磷摄入量的函数（以可利用磷（avP）为基础表示）。在四种非线性模型中，单分子模型和米氏模型描述了收益递减行为，而理查兹模型和摩根模型描述了S形行为，同时也能够描述收益递减。使用荟萃分析方法，将模型拟合到磷平衡研究中的avP摄入量与磷潴留数据。猪体重（BW）范围为43.5至133千克，avP的磷摄入量范围为0.055至0.468克/千克体重/天，总磷摄入量范围为0.151至0.806克/千克体重/天，磷潴留范围为0.026至0.329克/千克体重/天。使用拟合优度的统计量和残差检验对模型进行评估。单分子模型和米氏模型最能描述磷潴留与磷摄入量之间的关系。随着体重增加，育肥猪的内源性磷损失和维持所需的磷量高于生长猪。
