The evaluation of the quality of commercial diets is a topic of interest to dog owners and veterinarians. The aims of the study were to determine proximate analysis, metabolizable energy and some amino acids in dry dog diets for different ages, divided into three groups G1 (low price, grains included), G2 (medium price, grains included) and G3 (high price, grain-free). The hypothesis was tested that there are significant differences in the analysed values between dry dog diets from different price categories and between grain-free and grain-containing diets. Furthermore, the analysed values were compared with AAFCO and FEDIAF recommendations and with label values guaranteed by manufacturers to see whether there are any deviations. We analysed 60 samples of complete dry dog diets purchased in the Czech Republic, using the standard AOAC methods of proximate analysis. Metabolizable energy was calculated using the NRC equation, and 30 samples were analysed for selected amino acids. The results showed that there are significant differences in protein and amino acid contents between grain-free (G3) and grain-containing (G1,2) dog diets. G3 diets had significantly (p < 0.01) higher crude protein and essential amino acid contents. No significant differences were found between grain-containing diets G1 and G2. The results may indicate a higher proportion of animal components and a lower content of carbohydrates in G3 diets. Most of the tested dog diets met the AAFCO and FEDIAF recommendations. There were only a few deviations in threonine in G1 and G2 diets for growing dogs.

中文翻译：

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捷克市场上商业干狗粮的营养评估

商业饮食质量的评估是狗主人和兽医感兴趣的话题。该研究的目的是确定不同年龄干狗日粮中的近似分析、代谢能和一些氨基酸，分为三组 G1（低价，包括谷物）、G2（中价，包括谷物）和 G3（高价）价格，无谷物）。假设在不同价格类别的干狗日粮之间以及无谷物和含谷物日粮之间的分析值存在显着差异。此外，将分析值与 AAFCO 和 FEDIAF 建议以及制造商保证的标签值进行比较，以查看是否存在任何偏差。我们分析了在捷克共和国购买的 60 个完整的干狗饲料样本，使用标准 AOAC 近似分析方法。使用 NRC 方程计算代谢能，并分析了 30 个样品的选定氨基酸。结果表明，无谷物（G3）和含谷物（G1，2）狗粮的蛋白质和氨基酸含量存在显着差异。G3饮食显着（p  < 0.01) 更高的粗蛋白和必需氨基酸含量。含谷物日粮 G1 和 G2 之间没有发现显着差异。结果可能表明 G3 饮食中动物成分的比例更高，碳水化合物的含量更低。大多数经过测试的狗粮都符合 AAFCO 和 FEDIAF 的建议。生长犬 G1 和 G2 日粮中的苏氨酸只有少量偏差。