A good rule of thumb to obtain an optimum herd parity profile is that 90% of the gilts that are started in the herd should reach parity 1, and 90% of the parity 1 animals should reach parity 2 (Leman 1992).
一个用于最佳猪群胎龄结构的很好的经验法则是，进入种猪群的90%后备母猪应当达到1胎，而90%的1胎母猪应当达到2胎（李曼，1992年）。 (查看原文)
还没人写过短评呢
还没人写过短评呢