Genetic parameters and correlated responses in female reproductive traits in the GIFT strain

Azhar Hamzah; Nguyen Hong Nguyen; Wagdy Mekkawy; Hooi Ling Khaw; Hoong Yip Yee; Khairul Rizal Abu Bakar; Raul W Ponzoni; Siti Azizah Mohd Nor

doi:10.1111/are.12608

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Genetic parameters and correlated responses in female reproductive traits in the GIFT strain

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Genetic parameters and correlated responses in female reproductive traits in the GIFT strain

Azhar Hamzah, Nguyen Hong Nguyen, Wagdy Mekkawy, Hooi Ling Khaw, Hoong Yip Yee, Khairul Rizal Abu Bakar, Raul W Ponzoni and Siti Azizah Mohd Nor

Aquaculture Research, Vol.47(5), pp.1488-1498

2016

DOI: https://doi.org/10.1111/are.12608

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Abstract

reproductive performance

GIFT strain

heritability

genetic correlation

correlated response

The effect of selection for greater growth rate in the GIFT strain on traits related to female reproduction (weight at spawning, number of eggs, number of fry, total weight of fry and number of dead fry) was studied. Available records comprised 10 generations of data from a total of 935 breeding females with known pedigree. Female body weight at spawning was 255 g, whereas the averages for number of eggs, number of live fry at hatching, number of dead fry and total fry weight per spawning were 1444, 908, 64.90, and 7.24 g respectively. Heritabilities for reproductive traits were low to moderate (0.20 for number of eggs, 0.16 for number of hatched fry and 0.11 for fry weight per female at spawning). The genetic correlations between female body weight at spawning and reproductive traits were very low to low (0.01 to 0.31) and not significantly different from zero. The genetic correlations among reproductive traits (i.e. number of eggs, number of hatched fry and fry weight) were high (0.75 to 0.92). Phenotypic correlations were consistent with the genetic correlations, ranging from 0.56 to 0.85. Correlated responses in reproductive traits measured as differences in least squares means between Selection and Control lines were positive and significant (except for the number of dead fry) when age of females at spawning was fitted as a covariate. However, there were no significant differences in all studied traits when body weight of the female at spawning was fitted as a covariate within lines. This indicates that the greater reproductive rate was due to the greater size of females in the Selection line, but the efficiency of reproduction per unit weight of female did not change as a consequence of selection for growth.

Details

Title: Genetic parameters and correlated responses in female reproductive traits in the GIFT strain
Authors: Azhar Hamzah (Author) - University of Science Malaysia, Malaysia
Nguyen Hong Nguyen (Author) - World Fish Center, Malaysia
Wagdy Mekkawy (Author) - Ain Shams University, Egypt
Hooi Ling Khaw (Author) - World Fish Center, Malaysia
Hoong Yip Yee (Author) - World Fish Center, Malaysia
Khairul Rizal Abu Bakar (Author) - World Fish Center, Malaysia
Raul W Ponzoni (Author) - Montevideo, Uruguay
Siti Azizah Mohd Nor (Author) - University of Science Malaysia, Malaysia
Publication details: Aquaculture Research, Vol.47(5), pp.1488-1498
Publisher: Wiley-Blackwell Publishing Ltd.
Date published: 2016
DOI: 10.1111/are.12608
ISSN: 1355-557X
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering; Centre for Bioinnovation
Language: English
Record Identifier: 99448810902621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Fisheries