提高母猪繁殖力的研究

选用40头经产的长白、杜洛克、乐平猪及其杂种母猪,饲喂以中等营养水平配合料(每千克含消化能1.9～2.8兆卡、粗蛋白质11％～15％),采取重复配种和35～42日龄断奶等技术,连续测定两窝,其结果为:乐平母猪及其杂种母猪年繁窝数2.26窝、双窝产仔24.5～25.7头,育成20～22.3头,双窝60日龄重221～344千克、料肉比2.04～2.33:1;国外品种及其杂种母猪分别为2.16窝、22.5～23.75头、20～21头、316～388千克和1.9～2.23:1。

Studies on the Improvement of Sow Fertility

Fourty sows of landrace, Large youkshine, Duroc. Leping and their hybrid sows were tested in the present study for two continual litters, by means of repeated mating and weaning at 35-42 days old with a middle nutrition level Li. e. DE 1. 9~2. 8 Meal, DCP 11%~15% per kilogram ration). The main results appeared as follows, a) Leping and its hybrid sows reproduced an average of 2. 26 litters annually. Double - litter size was 24. 5-25. 7 heads at birth and 20-22. 3 heads at weaning. Double-litter weight was 221 - 344kg at 60 days old, and the feed conversion ratio 2. 04 ~2. 33 to 1. b) Those four corresponding indexes of the foreign breed and its hybrid sows were 2. 16 litters, 22. 5-23. 75 heads. 20-21 heads, 316-388kg, and 1. 9-2. 23 to 1. respectively