A breeding program for Nile tilapia in Brazil: Results from nine generations of selection to increase the growth rate in cages

A breeding program for Nile tilapia in Brazil: Results from nine generations of selection to increase the growth rate in cages

Variance components and heritabilities for daily weight gain (DWG) were estimated for Nile tilapia farmed in cages across nine generations (G1–G9) of selection in a breeding program in Brazil. DWG was measured in 16,272 accumulated tagged animals representing 535 full‐ and half‐sib families of Nile...

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Bibliographic Details
Published in:Journal of animal breeding and genetics (1986) Vol. 139; no. 2; pp. 127 - 135
Main Authors: Yoshida, Grazyella Massako, Oliveira, Carlos Antonio Lopes, Campos, Eric Costa, Todesco, Humberto, Araújo, Filipe C. T., Karin, Hanner Mahmud, Zardin, Aline M. S. O., Bezerra Júnior, Jailton S., Filho, Luiz Alexandre, Vargas, Lauro, Ribeiro, Ricardo Pereira
Format: Journal Article
Language:English
Published: Germany Blackwell Publishing Ltd 01-03-2022
Subjects:
Animals
Brazil
Breeding
Cages
Cichlids - genetics
daily weight gain
Environmental effects
Genetic diversity
Genetic improvement
genetic trends
Genetic variance
Growth rate
Heritability
inbreeding
Oreochromis niloticus
Ponds
Tilapia
Weight Gain
Brazil
Oreochromis niloticus
daily weight gain
inbreeding
genetic trends
heritability
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Summary:Variance components and heritabilities for daily weight gain (DWG) were estimated for Nile tilapia farmed in cages across nine generations (G1–G9) of selection in a breeding program in Brazil. DWG was measured in 16,272 accumulated tagged animals representing 535 full‐ and half‐sib families of Nile tilapia under cage farming. The additive genetic variance showed a slight variation (0.051–0.066), and heritability estimates ranged from 0.20 to 0.33. The common environmental effect accounted for a higher proportion of the total variance in DWG, especially in the last generations (6%–24%). A genetic trend based on all data available showed a substantial increase in the DWG (about 3.3% per generation) of Nile tilapia across nine generations of selection. Furthermore, our results demonstrate ample scope for further genetic improvement.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0931-2668
1439-0388
DOI:10.1111/jbg.12650