摘要：

The reproductive performance over five parities of two one-quarter Meishan female genotypes were compared with a three-breed cross female genotype based on conventional breeds of pigs. Hampshire-sired progeny from these females were evaluated for growth performance and carcass measures. The female genotypes evaluated were Landrace X (Meishan X Yorkshire)(LMeY)(n=45), Duroc X (Meishan X Yorkshire) (DMeY)(n=41), and Landrace X (Duroc X Yorkshire) (LDY) (n=50), respectively. LMeY had a greater numberof pigs born alive (11.1, 10.6, and 10.2, SE=0.24 for LMeY, DMeY, and LDY, respectively, P<0.05 ) and a higher total litter birth weight (20.02, 18.16, and 17.29, SE=0.383kg for LMeY, DMeY, and LDY, respectively, p<0.001) than the other lines. Gestationlength was reduced for the two Meishan-cross genotypes (114.5, 114.3, and 114.9, SE=0.18, for LMeY, DMeY and LDY, respectively; p<0.001). A shorter farrowing interval was observed for the LMeY (14.7, 148.6 and 151.4, SE=1.32 for LMeY, DMeY, DMeY and LDY.respectively; p<0.05). Number of pigs weaned per litter was highest for LMeY line (10.7, 10.0, and 9.4, SE=0.22 for LMeY, DMeY and LDY, respectively; No differences (p>0.05) were observed between the Hampshire-sired progeny of the three dam genotypes for growth performance, backfat thickness and loin eye depth at 114 kg. These results indicate that the development of a female line with one-quarter Meishan may result in improved reproductive efficency compared to female lines based on western breeds.

展开