T4 concentration also existed Significant difference(P<0.05)between mid and late stage of lactation.
T4浓度在泌乳后期和中期之间也存在着显著差异（P＜0．05）。
Significant variations in milk composition occur as a result of differences in feeding regime, breed, stage of lactation and climate.
乳制品成分含量有明显不同的是因为饲料、饲养环境及气候存在差异。
Base treatment protocols on the cow's treatment history; length of the infection; and cow age, health status and lactation stage.
治疗方案基于奶牛的治疗史，感染时间长度，和奶牛的年龄、健康状况和泌乳期。
Base treatment protocols on the cow's treatment history; length of the infection; and cow age, health status and lactation stage.
治疗方案基于奶牛的治疗史，感染时间长度，和奶牛的年龄、健康状况和泌乳期。
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