原來是這樣的,明白了。365天剛剛好,看來人類找母牛產奶是有道理的。謝謝~~
回答: 跟人不同奶牛可一邊泌乳一邊懷胎牛的擠乳期是305天左右再加上60天幹乳期正好為一整年。去年在郊外買了個大農場度假屋也包括幾隻乳牛
由 xianrenzhang.
於 2018-06-15 15:25:03
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