Department of Veterinary Sciences, Chair of Animal Nutrition and Dietetics, Ludwig-Maximilians-Universität München, Munich, Germany.
PLoS One. 2019 Aug 2;14(8):e0220305. doi: 10.1371/journal.pone.0220305. eCollection 2019.
Calcium and phosphorus requirements for growing dogs can be calculated by different methods. The current standard feeding recommendations are based on experimental data derived from young giant breed puppies. In order to determine the absolute requirement, an extrapolation via metabolisable energy requirement is recommended. Another approach is to calculate the requirement factorially, taking into account the endogenous losses and the amount of calcium and phosphorus retained due to tissue accretion during growth as well as the expected availability of these nutrients. The working hypothesis was that both methods are valid and lead to comparable results in young puppies of a high mature body weight (BW). Yet, deviations for other age and mature BW groups were expected. Thus, the aim of the present study was to compare the results of both methods using exemplary puppies of different age and mature BW groups. The hypotheses could be verified for calcium. The extrapolated requirements overestimate the factorial requirements by up to 59.7% for puppies <60kg mature BW and/or >6 months of age. In case of phosphorus requirement, the deviations between both methods are overall very high in all stages. Taking into account the potentially harmful effects of calcium and phosphorus excess, the feeding recommendations based on the extrapolation should be reconsidered.
钙和磷的生长犬需求量可通过不同方法计算。目前的标准喂养建议是基于从小型巨型犬幼犬得出的实验数据。为了确定绝对需求量，建议通过可代谢能量需求进行外推。另一种方法是通过考虑内源性损失以及由于生长过程中的组织积累而保留的钙和磷的量，以及这些营养素的预期可用性，以因子的方式计算需求量。工作假设是这两种方法都是有效的，并导致高成熟体重（BW）的幼犬产生可比的结果。然而，预计其他年龄和成熟 BW 组会有偏差。因此，本研究的目的是使用不同年龄和成熟 BW 组的示例幼犬比较这两种方法的结果。可以验证钙的假设。对于 <60kg 成熟 BW 和/或 >6 个月大的幼犬，外推的需求量比因子需求量高出高达 59.7%。就磷需求而言，两种方法在所有阶段的偏差都非常高。考虑到钙和磷过量的潜在有害影响，应重新考虑基于外推的喂养建议。
