Female-controlled embryos from high yield cows in America were transplanted to 648 scalper recipients of natural estrus under countryside condition.

 
  • 從美國引進(jìn)高產(chǎn)奶牛性控雌性胚胎,在農村條件下,選擇自然發(fā)情的黃牛作受體,移植合格受體牛648頭。
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