Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone

Background: Production of monosex cultures of females is desirable in commercial aquaculture of certain species due to their higher growth rate. Ideally, females should be free of exogenous hormones. The initial step to produce hormone-free all-female offspring is masculinization of normal females t...

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Autores principales:	Luciano A. Weiss, Jurandir J. Bernardes Júnior, Claudia Machado, Alex P. de Oliveira Nuñer
Formato:	article
Lenguaje:	EN
Publicado:	Universidad de Antioquia 2018
Materias:	histology fish gonads monosex culture neomales sex reversal Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/d0cfcfc578af4748baa8ad6abdce5c12
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spelling	oai:doaj.org-article:d0cfcfc578af4748baa8ad6abdce5c122021-12-01T19:35:10ZMasculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone2256-295810.17533/udea.rccp.v31n4a07https://doaj.org/article/d0cfcfc578af4748baa8ad6abdce5c122018-12-01T00:00:00Zhttps://revistas.udea.edu.co/index.php/rccp/article/view/330972https://doaj.org/toc/2256-2958Background: Production of monosex cultures of females is desirable in commercial aquaculture of certain species due to their higher growth rate. Ideally, females should be free of exogenous hormones. The initial step to produce hormone-free all-female offspring is masculinization of normal females to create sex reversed animals, called neomales, which are then be bred with normal females obtaining all-female offspring. Objective: To masculinize Rhamdia quelen fry by adding 17α-methyltestosterone (MT) hormone to the feed. Methods: Larvae of R. quelen were fed diets supplemented with 60, 80, or 100 mg MT/kg feed for 21 days. A control group was fed the same diet free of MT. At 150 days post-hatching, 30 fish of each treatment group were euthanized to evaluate gonadal changes using histological techniques. Results: MT significantly affected the differentiation of female gonads in the 60 and 80 mg MT/kg feed groups. Sex reversal was observed in all MT treatment groups, with 50, 40, and 20% neomales produced with 60, 80, and 100 mg MT/kg feed, respectively. Intersex gonads were observed only in the masculinization treatment groups. Inhibitory effects on gonadal development of females and males were observed at the highest MT doses. Conclusion: Dietary administration of MT effectively masculinizes R. quelen fry; however, the lowest dose of 60 mg/kg feed is recommended, since higher doses have inhibitory effects on gonadal development in both sexes.Luciano A. WeissJurandir J. Bernardes JúniorClaudia MachadoAlex P. de Oliveira NuñerUniversidad de Antioquiaarticlehistologyfish gonadsmonosex cultureneomalessex reversalAnimal cultureSF1-1100ENRevista Colombiana de Ciencias Pecuarias, Vol 31, Iss 4, Pp 304-314 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	histology fish gonads monosex culture neomales sex reversal Animal culture SF1-1100
spellingShingle	histology fish gonads monosex culture neomales sex reversal Animal culture SF1-1100 Luciano A. Weiss Jurandir J. Bernardes Júnior Claudia Machado Alex P. de Oliveira Nuñer Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone
description	Background: Production of monosex cultures of females is desirable in commercial aquaculture of certain species due to their higher growth rate. Ideally, females should be free of exogenous hormones. The initial step to produce hormone-free all-female offspring is masculinization of normal females to create sex reversed animals, called neomales, which are then be bred with normal females obtaining all-female offspring. Objective: To masculinize Rhamdia quelen fry by adding 17α-methyltestosterone (MT) hormone to the feed. Methods: Larvae of R. quelen were fed diets supplemented with 60, 80, or 100 mg MT/kg feed for 21 days. A control group was fed the same diet free of MT. At 150 days post-hatching, 30 fish of each treatment group were euthanized to evaluate gonadal changes using histological techniques. Results: MT significantly affected the differentiation of female gonads in the 60 and 80 mg MT/kg feed groups. Sex reversal was observed in all MT treatment groups, with 50, 40, and 20% neomales produced with 60, 80, and 100 mg MT/kg feed, respectively. Intersex gonads were observed only in the masculinization treatment groups. Inhibitory effects on gonadal development of females and males were observed at the highest MT doses. Conclusion: Dietary administration of MT effectively masculinizes R. quelen fry; however, the lowest dose of 60 mg/kg feed is recommended, since higher doses have inhibitory effects on gonadal development in both sexes.
format	article
author	Luciano A. Weiss Jurandir J. Bernardes Júnior Claudia Machado Alex P. de Oliveira Nuñer
author_facet	Luciano A. Weiss Jurandir J. Bernardes Júnior Claudia Machado Alex P. de Oliveira Nuñer
author_sort	Luciano A. Weiss
title	Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone
title_short	Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone
title_full	Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone
title_fullStr	Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone
title_full_unstemmed	Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone
title_sort	masculinization of (rhamdia quelen) through dietary administration of 17α-methyltestosterone
publisher	Universidad de Antioquia
publishDate	2018
url	https://doaj.org/article/d0cfcfc578af4748baa8ad6abdce5c12
work_keys_str_mv	AT lucianoaweiss masculinizationofrhamdiaquelenthroughdietaryadministrationof17amethyltestosterone AT jurandirjbernardesjunior masculinizationofrhamdiaquelenthroughdietaryadministrationof17amethyltestosterone AT claudiamachado masculinizationofrhamdiaquelenthroughdietaryadministrationof17amethyltestosterone AT alexpdeoliveiranuner masculinizationofrhamdiaquelenthroughdietaryadministrationof17amethyltestosterone
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Masculinization of (Rhamdia quelen) through dietary administration of 17α-methyltestosterone

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