Author/Authors :
Andriantahina ، F. نويسنده College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture,Shaanxi Yangling China , , Liu ، X. نويسنده College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture,Shaanxi Yangling China , , Xiang ، J. نويسنده Experimental Marine Biology Laboratories, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. , , Huang ، H. نويسنده Hainan Guangtai Ocean Breeding Company Limited, Haikou 570000, China. ,
Abstract :
Litopenaeus vannamei were reared in commercial ponds over two generations with full pedigree information. Weights, heritability, phenotypic and genetic correlations of animals were measured at 120, 150 and 180 days of age. Shrimp had mean weights with standard errors of 16.44±5.57 g, 30.90±9.64 g and 39.70±12.38 g for females; and 14.14±4.88 g, 19.30±7.54 g and 24.26±8.23 g for males respectively at 120, 150 and 180 days of age. These weights corresponding to mean growth rates of about 0.39±0.11 g/d for females and 0.17±0.05 g/d for males from 120 to 180 days. The estimates of heritability with standard errors at 120, 150 and 180 days were 0.44±0.11, 0.46±0.13 and 0.44±0.11 respectively. Genetic correlation between weight 120 and weight 150 was 0.94±0.03; and correlation between weight 120 and weight 180 was 0.93±0.02. Genetic correlation between weight 150 and later measure was 0.93±0.02. As potential early life breeding effects likely dissipate with increasing age, our outcomes suggest that improvements in harvest weight should be yielded by weight-based selections between 120 and 150 days, at which can be exploited to enhance yield rate by mass selection.
