Yilmaz Emre, Uysal Soner
Department of Animal Nutrition and Nutritional Diseases, Faculty of Veterinary Medicine, Ataturk University, Erzurum, Turkiye.
Anim Sci J. 2025 Jan-Dec;96(1):e70017. doi: 10.1111/asj.70017.
This study aims to evaluate the relationship between mineral digestibility and fecal characteristics and compare digestibility in dry and late-lactating cows. A total of 107 multiparous Holstein and Simmental cows were included, with 66 cows in late lactation and 41 cows in the dry period. The apparent digestibility of key macro minerals, dry matter content in feces, dirtiness scores, fecal characteristics, and serum macro mineral levels were determined. Cows consuming the same diet were arranged according to a completely randomized design. Results showed that, compared to the late lactation group, the dry period group had a significantly lower total dirtiness score, higher phosphorus digestibility, and elevated serum calcium levels (p < 0.05). Additionally, fecal consistency and fecal height were greater in the dry period group (p < 0.05). However, the increased phosphorus digestibility observed during the dry period was not significantly associated with fecal consistency (r = +0.225, p < 0.05) or the total contamination score (r = -0.339, p < 0.05). Consequently, this study reveals that understanding the differences in mineral digestibility between different physiological stages can enhance nutritional approaches for better dairy cow management.
本研究旨在评估矿物质消化率与粪便特征之间的关系,并比较干奶期和泌乳后期奶牛的消化率。总共纳入了107头经产荷斯坦奶牛和西门塔尔奶牛,其中66头处于泌乳后期,41头处于干奶期。测定了关键常量矿物质的表观消化率、粪便中的干物质含量、脏污评分、粪便特征以及血清常量矿物质水平。对采食相同日粮的奶牛按照完全随机设计进行安排。结果表明,与泌乳后期组相比,干奶期组的总脏污评分显著更低、磷消化率更高且血清钙水平升高(p < 0.05)。此外,干奶期组的粪便稠度和粪便高度更大(p < 0.05)。然而,干奶期观察到的磷消化率增加与粪便稠度(r = +0.225,p < 0.05)或总污染评分(r = -0.339,p < 0.05)均无显著关联。因此,本研究表明,了解不同生理阶段之间矿物质消化率的差异可以改进营养方法,以更好地管理奶牛。
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