[Objective]The aim was to evaluate heterosis of hybridization groups of New Zealand White rabbits and Fujian Yellow rabbits. [Method] Totaling 80 rabbits,including New Zealand White rabbits,Fujian Yellow rabbits,and d...[Objective]The aim was to evaluate heterosis of hybridization groups of New Zealand White rabbits and Fujian Yellow rabbits. [Method] Totaling 80 rabbits,including New Zealand White rabbits,Fujian Yellow rabbits,and direct-cross and reciprocal cross rabbits were measured in slaughter performance and meat quality. [Result] Live-weight,evisceration weight and semi-evisceration weight of rabbits in four groups were 1 817. 20 -2 308. 60,914. 10 -1 231. 50 and 985. 99 -1 315. 20 g,respectively. For slaughter performance,FY × NZ was the highest among male rabbits and NZ was the highest among female rabbits. In addition,shear forces of crureus and longissimusdorsi for rabbits in four groups were 25. 11 -40. 44 and 18. 02 -26. 44 N,respectively,among which male NZ was the lowest in shear force of crureus and female NZ was the lowest of longissimusdorsi. Water-loss rates of crureus and longissimusdorsi were 33. 43% -41. 52% and 31. 79% -39. 01%,among which male NZ proved the lowest in water-loss of crureus and male FY achieved the lowest level for the rate of longissimusdorsi. [Conclusion]Hybrid groups showed some heteroses in slaughter performance and meat quality.展开更多
Pinctada martensii is an important shellfish for the production of sea pearls in China.To improve the growth performance of P.martensii,we successfully established three complete diallel crosses using three new variet...Pinctada martensii is an important shellfish for the production of sea pearls in China.To improve the growth performance of P.martensii,we successfully established three complete diallel crosses using three new varieties of P.martensii,which were named Haiyou No.1,Haixuan No.1,and Nanke No.1,to investigate the growth performance of each self-cross line and hybrid line in Beihai,Guangxi Zhuang Autonomous Region,China.Generally,high fertilization and hatching rates were observed in the experiment,suggesting that there was no sperm-egg recognition barrier among these three P.martensii varieties.The survival rate of the self-cross lines was relatively higher than that of hybrid lines,and♀‘Haixuan No.1’×♂‘Haiyou No.1’maintained a high survival rate during the grow-out stage.The shell length and width were affected by the genotypes as well as the interaction between the genotypes and environmental factors on day 400.The variances of the general combining abilities(GCA)and specific combining abilities(SCA)for shell length and width were the result of both additive genetic variance and nonadditive genetic variance.When Haixuan No.1 was the female parent and Nanke No.1 was the male parent,the GCA for shell length and width were both positive on day 400.The heterosis of Haixuan No.1 and Nanke No.1 in terms of shell length and width was positive.From the resulting combining ability and heterosis,♀‘Haixuan No.1’×♂‘Nanke No.1’was considered an ideal hatchery method to improve the growth performance of P.martensii.Our results therefore demonstrated that crossbreeding among these three new varieties can further improve the growth performance of P.martensii.展开更多
基金funded by Nantong Science and Technology Innovation Plan (AS2010020)Nantong Application and Researching Program (K2010066)
文摘[Objective]The aim was to evaluate heterosis of hybridization groups of New Zealand White rabbits and Fujian Yellow rabbits. [Method] Totaling 80 rabbits,including New Zealand White rabbits,Fujian Yellow rabbits,and direct-cross and reciprocal cross rabbits were measured in slaughter performance and meat quality. [Result] Live-weight,evisceration weight and semi-evisceration weight of rabbits in four groups were 1 817. 20 -2 308. 60,914. 10 -1 231. 50 and 985. 99 -1 315. 20 g,respectively. For slaughter performance,FY × NZ was the highest among male rabbits and NZ was the highest among female rabbits. In addition,shear forces of crureus and longissimusdorsi for rabbits in four groups were 25. 11 -40. 44 and 18. 02 -26. 44 N,respectively,among which male NZ was the lowest in shear force of crureus and female NZ was the lowest of longissimusdorsi. Water-loss rates of crureus and longissimusdorsi were 33. 43% -41. 52% and 31. 79% -39. 01%,among which male NZ proved the lowest in water-loss of crureus and male FY achieved the lowest level for the rate of longissimusdorsi. [Conclusion]Hybrid groups showed some heteroses in slaughter performance and meat quality.
基金funded by the National Natural Science Foundation of China(No.911221680).
文摘Pinctada martensii is an important shellfish for the production of sea pearls in China.To improve the growth performance of P.martensii,we successfully established three complete diallel crosses using three new varieties of P.martensii,which were named Haiyou No.1,Haixuan No.1,and Nanke No.1,to investigate the growth performance of each self-cross line and hybrid line in Beihai,Guangxi Zhuang Autonomous Region,China.Generally,high fertilization and hatching rates were observed in the experiment,suggesting that there was no sperm-egg recognition barrier among these three P.martensii varieties.The survival rate of the self-cross lines was relatively higher than that of hybrid lines,and♀‘Haixuan No.1’×♂‘Haiyou No.1’maintained a high survival rate during the grow-out stage.The shell length and width were affected by the genotypes as well as the interaction between the genotypes and environmental factors on day 400.The variances of the general combining abilities(GCA)and specific combining abilities(SCA)for shell length and width were the result of both additive genetic variance and nonadditive genetic variance.When Haixuan No.1 was the female parent and Nanke No.1 was the male parent,the GCA for shell length and width were both positive on day 400.The heterosis of Haixuan No.1 and Nanke No.1 in terms of shell length and width was positive.From the resulting combining ability and heterosis,♀‘Haixuan No.1’×♂‘Nanke No.1’was considered an ideal hatchery method to improve the growth performance of P.martensii.Our results therefore demonstrated that crossbreeding among these three new varieties can further improve the growth performance of P.martensii.
