二元杂种母猪繁殖性能的研究

REPRODUCTIVE PERFORMANCE OF PORCINE FEMALE CROSSBREDS

本文研究１９头长梅杂种母猪（长白猪×梅山猪）和１８头汉梅杂种母猪（汉普夏猪 ×梅山猪）的繁殖性能。结果表明：长梅和汉梅母猪的发情征兆不及地方猪种 明显．长梅和汉梅母猪发情持续期为４天左右，性欲维持２天左右；初配和第二 胎发情配种，情期受胎率分别为９３．２％和９７．ｌ％；头胎和第二胎，窝平产仔数 分别为１１．９头和１４．３头，活产仔数分别为７．６头和１３．４头； ４０日龄断奶窝重分 别为５８．００ｋｇ和１０３．０２ｋｇ。梅山二元杂种母猪保持了梅山猪的高繁殖力特点．

Reproductive performance of 19 landrace X Mei (LM) gilts and sows and 18 Hampshire X Meishan (HM) gilts and sows was studied. The results were as follows: Estrous signs of LM and HM gilts and sows were less obvious than those of the local breeds. The estrus duration of tie LM and un female pigs was about 4 days and their libido lasted about 2 days. The conception rate of the gi its was 91. 2% and the sows 97. 1%. For the gilts and sows, the litter size was 11. 9 and 14. 3 respectively, and the alive piglets per litter at birth,ere 7.6 and 18. 4 respectively, and 40-day weaning weight was 58.00kg and 103. 02kg respectively. The crossbreds were also exceptionally prolificacy as thire female parent-Meishan pigs.