The Comparison Study Of Performance Of Two-way Crossbreds By Landrace Boars And Large White Sows

Landrace × Large white miscellaneous sows in combination with two lean pig breed of Landrace and Large white's characteristics and heterosis, is one of the world's most popular commercial maternal type, the manifestation of high fecundity, strong adaptability, fast growth and high lean meat at the same time, the market weight big, fattening high economic performance. Based on the different strain landrace x large white binary hybrid combination as the research object, carry out 2×2 factorial experiment to investigate the reproductive performance, the growth performance of fattening statistical differences between groups, screening data basis for further breeding department: through the W52(French landrace) boar and the W62(French large white) sow and the W64(New French large white) hybrid the W52×W62 sows and the W52×W64 sows, through the W51(WENS landrace) boar and the W62(French large white) sow and the W64(New French large white) hybrid the W5×W62 sows and the W51×W64 sows,it is need to do some statistical analysis of the four kinds of landrace x large white hybridization sows strains supporting effect, including the total number of litter, the healthy litter, the invalid litter, such as reproductive performance, including daily gain, feed weight ratio, fat thickness and so on growth performance. And it is need to analy the performance of the four kinds of sows matching with DD(WENS American Duroc), expected to select high-quality two miscellaneous sow form a complete set of combination, so as to provide theoretical basis for future breeding production.In different strains of landrace and large white nest of childbirth are supporting in comparison to the total number of piglets, The W51×W64 is significantly higher than the others(P < 0.05), Showing the W51 matching with the W64 has highest output. In the nest in the average number of healthy piglets for contrast, the W51×W64 is no significant difference of the W52×W64(P=0.716),but mean value is significantly higher than the other two(P < 0.05); Show the W51×W64 and the W52×W64 are most advantage to the other in the effective output. In the nest is void number of piglets contrast, the W51×W64 is significantly higher than that of the other three supporting(P < 0.05); Accounting for the embryo adaptability of the W51×W64 is the worst.In different strains of Landrace and Large white matching two miscellaneous sows AGE60, four kit had no significant difference(P=0.326), in ADG60 contrast, four matching is also no significant difference P=0.162), showed that four kinds of form a complete set of pig growth rate had no significant difference. In BF60 contrast, the W51×W64 is significantly lower than the other three supporting(P < 0.05), indicating the W51×W64 is less fat and higher lean meat. In the feed conversion ratio comparison, the W52×W64 is significantly lower than the W51×W64(P <0.05), suggesting the feed of the the W52×W64 is better paid, and greater economic benefits than the W51×W64.In different supporting two strains mixed sows and DD boar breeding nest, in comparison to the total number of piglets,DD×W52×W62 is significantly lower than the others(P<0.05), Showing the DD matching with W52×W62 has lowest output. In the nest of the average number of healthy piglets for contrast, DD×W51×W64 is significantly higher than DD×W52×W64 and DD×W52×W62(P<0.05), suggesting that DD×W51×W64 has most advantage effective output. In the nest is void number of piglets contrast DD× W51×W64 and DD× W52×W62 have no significant difference(P=0.851), but significantly lower than the other two(P < 0.05), indicating that the DD×W51×W64 has the same embryonic adaptation with DD×W52×W62, and better than the other two.The results show that W51×W64 and W52×W64 is no significant difference in health piglets(P=0.716), but the former is less adaptability of embryos, W64; Four supporting two miscellaneous sows growth there was no significant difference, W51×W64 has least fat and highest lean to the other, W52×W64 is higher than W51×W64 in feed remuneration; DD×W51×W64 has embryo most adaptable and the highest health numbers of piglets. Comprehensive the above conclusions, DD ×W51×W64 is the most advantage of miscellaneous sows than others, but it is need to strengthen the feed conversion ratio of W51, DD×W52×W62 is the worst advantage of miscellaneous sows than others.