As a result, the world's food supply has become largely dependent on a shrinking list of breeds designed for maximum yield: the Rhode Island Red chicken, the largeWhitepig, the Holstein cow.
This experiment studied Gannong Strain (developed from black pig of Gansu) and the LargeWhite of USSR, and their fattening properties after their positive and negative cross - breeding.
本试验较详细地研究了正在培育的甘肃黑猪甘农系群与苏联大白猪及其正反杂交猪的肥育性能。
3
Genetic analysis was conducted on the data of 3 populations with 1 686 litters including Erhualian pig, LargeWhite and first cross.