現在的大多數奶牛是基因改造了的,乳腺一輩子分泌乳汁,不必受孕。
所有跟帖:
• 補充一句,這是最近在一篇文章裏讀到的,裏麵也沒細談如何改變基因。 -瑞冬- ♂ (0 bytes) () 11/23/2010 postreply 13:09:03
• 補充一句,這是最近在一篇文章裏讀到的,裏麵也沒細談如何改變基因。 -瑞冬- ♂ (0 bytes) () 11/23/2010 postreply 13:09:03
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