Identification of neomales in South American catfish Rhamdia quelen on the basis of the sex ratio in the progeny
Anim. Reprod. (Online)
; 14(supl. 1): 1285-1291, 2017. ilus, tab, graf
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BR68.1
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ABSTRACT
In the present study, we aimed to identify masculinized genotypic females of Rhamdia Quelen on the basis of the sex ratio of the progeny. Masculinizing diets containing 3 levels of 17α-methyltestosterone (MT; 60, 90, or 120 mg kg-1) were administered to R. quelenfry. Thereafter, 5 phenotypic males from each MT treatment were crossed with normal females, and their progenies were sexed. At least 1 male from each treatment group generated progeny with a higher femalemale ratio. These males, designated M60, M90, and M120, were crossed again with 3 other normal females to re-evaluate the sex ratio of the progeny. Moreover, a normal male was used as a control. Again, we found a higher femalemale ratio in the progeny of M60, M90, and M120. The control male produced 2sets of balanced progeny and 1 with a lower femalemaleratio. Although these breeders did not generate all- female progeny (79.75 ± 7.20% of females), our findingsindicate that M60, M90, and M120 can be considered masculinized genotypic females of R. quelen, suggesting the involvement of autosomal genes or polygenic interactions in sex determination.
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En
Revista:
Anim. Reprod.
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Anim. Reprod. (Online)
Ano de publicação:
2017
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Article
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