Heritability, genetic line and inbreeding effects on resistance of whiteleg shrimp Penaeus vannamei Boone 1931 to acute hepatopancreatic necrosis disease (AHPND) in Mexico
2018
Castillo-Juárez, H. | Betancourt-Lozano, M. | Gómez-Gil, B. | Gallaga-Maldonado, E. P. | Soto-Rodríguez, S. A. | Campos-Montes, G. R. | Montaldo, H. H. | Caballerozamora, A. | Martínez-Ortega, A. | Lozano-Olvera, R. | Quintana-Casares, J. C.
The objective of this paper is to present preliminary results regarding heritability, genetic line differences and inbreeding effects for survival time in experimental challenges to acute hepatopancreatic necrosis disease (AHPND) in Penaeus vannamei Boone 1931. Here we present results of analyses conducted on data from a Resistance Line obtained from a merging of several Ecuadorian groups with a history of white-spot syndrome virus resistance, and a Growth Line with high genetic growth ability, obtained by selection in a Mexican hatchery. Family-identified animals from the two genetic lines and their crosses were inoculated by immersion in 2014, 2015 and 2016 using a Vibrio parahaemolyticus strain (M0904) AHPND+ obtained from a natural infection in Mexico. Heritabilities for survival time obtained using nested linear mixed models ranged from 9 to 18 %. Survival was greater for the Resistance Line compared to the Growth Line or the F1 cross (P < 0.02). Our results point to the presence of additive genetic variation in both lines evaluated that may be exploited in breeding programmes to increase AHPND resistance. Additionally, our results support the idea that the Resistance Line is more resistant to AHPND than the Growth Line. Finally, comparisons between inbred and non-inbred animals suggest that the effect of inbreeding on AHPND resistance is small.
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