Abstract The physico-chemical characteristics and somatic cell count of donkey mammary secretion during the first ten days after foaling were analysed. During this period, a decreasing trend was observed for protein, dry matter and ash levels. The lowest values for lactose and pH were detected in the first hours (4.01 g 100 mL−1 of milk and 6.69 pH units), while the fat showed a peak (3.42 g 100 mL−1 of milk) at 6 h. The highest urea level was at 6 and 12 h (56.18 and 51.55 mg dL−1). Mineral levels changed during the experimental period, except for calcium, zinc and iron. Mean diameter of the fat globules and classes of fatty acids did not show significant differences; however, the n6/n3 ratio was influenced by day of lactation. In conclusion, the colostrum phase in donkeys lasts about 12–24 h, after which the secretion can be considered as transitional milk.

中文翻译：

---

哺乳期前十天驴乳腺分泌物的质量

摘要 分析了产仔后前10天驴乳腺分泌物的理化特性和体细胞计数。在此期间，观察到蛋白质、干物质和灰分水平呈下降趋势。在最初的几个小时内检测到乳糖和 pH 值的最低值（4.01 g 100 mL-1 牛奶和 6.69 pH 单位），而脂肪在 6 小时出现峰值（3.42 g 100 mL-1 牛奶）。最高尿素水平出现在 6 和 12 小时（56.18 和 51.55 mg dL-1）。矿物质水平在实验期间发生了变化，除了钙、锌和铁。脂肪球的平均直径和脂肪酸的种类没有显示出显着差异；然而，n6/n3 比率受泌乳天数的影响。总之，驴的初乳阶段持续约 12-24 小时，