Comparative study on reproductive and growth performance of different lines and interline crossesof Yorkshire pigs
To investigate the differences of reproductive performance and growth performance of different lines and interline crosses of Yorkshire pigs,the reproductive traits(total number of piglets born,number of live piglets born and birth weight)and growth traits(birth weight,21-d weight,30 kg age,100 kg age and back fat thickness)were measured and analyzed in the third parity of the Yorkshire pigs from American,French,Danish,American×French,American×Danish and French×Danish.The results showed that the total number of piglets born,the number of live piglets born and the birth weight of the litter in the Danish strain were significantly higher than those in the American and French strains(P<0.01),the birth weight was significantly lower than that in the American strain(P<0.05),and the 21-d weight and back fat thickness were significantly lower than those in the American and French strains(P<0.05);the total number of piglets born and the birth weight of the French strains were significantly higher than those in the French strains(P<0.05);no significant difference in birth weight,21-d weight and back fat thickness was found between the American and French strains(P>0.05),and no significant difference in 30 kg age and 100 kg age was found between the American,French and Danish strains(P>0.05).The total number of piglets born in the French×Danish crosses was significantly higher than that in the American×French crosses(P<0.01),and was significantly higher than that in the American×Danish crosses(P<0.05),and the number of live piglets born and the birth weight of the litter were significantly higher than those in the American×French and American×Danish crosses(P<0.01).No significant difference in the total number of piglets born,the number of live piglets born and the birth weight of the litter was found between the American×French and American×Danish crosses(P>0.05).21-d weight of the American×Frenchcrosses was significantly higher than that of the French×Danish crosses(P<0.05),and no significant difference in birth weight,30 kg age,100 kg age and back fat thickness was found between the American×French,American×Danish and French×Danish crosses(P>0.05).The results indicated that the reproductive performance of Danish and Danish-containing Yorksire pigs was better than that of the French and French-containing Yorkshire pigs,and American and American-containing Yorkshire pigs;the growth performance of American and American-containing Yorkshire pigs was better than that of French and French-containing Yorkshire pigs,and Danish and Danish-containing Yorksire pigs.
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