会的,兄弟姐妹之间大概在4/5代时问题就会出现了。 所以有人会在天鹅一岁左右跟别人的同种天鹅换一只,避免近亲交配。
本帖于 2021-09-18 15:55:51 时间, 由普通用户 老文学读者 编辑
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