原来是这样的,明白了。365天刚刚好,看来人类找母牛产奶是有道理的。谢谢~~
回答: 跟人不同奶牛可一边泌乳一边怀胎牛的挤乳期是305天左右再加上60天干乳期正好为一整年。去年在郊外买了个大农场度假屋也包括几只乳牛
由 xianrenzhang.
于 2018-06-15 15:25:03
WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.
Copyright ©1998-2025 wenxuecity.com All rights reserved. Privacy Statement & Terms of Use & User Privacy Protection Policy