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

Grazyella Massako YoshidaCarlos Antonio Lopes de OliveiraEric Costa CamposHumberto TodescoFilipe C T AraújoHanner Mahmud KarinAline M S O ZardinJailton S Bezerra JúniorLuiz Alexandre FilhoLauro VargasRicardo Pereira Ribeiro
Published in: Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie (2021)
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.
Keyphrases
  • weight gain
  • genome wide
  • body mass index
  • quality improvement
  • copy number
  • birth weight
  • weight loss
  • gene expression
  • dna methylation
  • big data
  • risk assessment
  • deep learning
  • human health
  • gestational age
  • life cycle