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Study on hormone induction of the male parent and embryonic development, gonad differentiation, and growth of "All-female No.1" . | LitMetric

Study on hormone induction of the male parent and embryonic development, gonad differentiation, and growth of "All-female No.1" .

Heliyon

Zhejiang Institute of Freshwater Fisheries, Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Freshwater Aquatic Animal Genetic and Breeding of Zhejiang Province, Huzhou, Zhejiang, 313001, China.

Published: July 2024

AI Article Synopsis

  • Female fish grew faster than males in a study that bred a new variety called "All-female No.1" using gynogenetic female and pseudo-male parents.
  • Hormone induction using low doses of 17α-methyltestosterone was ineffective, while higher doses led to functional pseudo-males and various types of gonads that eventually differentiated into ovaries by 15 months.
  • All-female embryos developed normally without transitioning to testis, demonstrating faster and more uniform growth compared to common fish, indicating the effectiveness of specific hormone treatments in maintaining female traits during development.*

Article Abstract

Female was faster in growth rate than males. In this study, the gynogenetic G2 and the pseudo-male G2' were used as the female and male parents, respectively, to breed a new national variety "All-female No.1" (AFC). Hormone induction, embryonic development, gonadal differentiation, and growth of AFC were studied. The results showed induction with low concentrations of 17α-methyltestosterone in a indoor-net cage culture was not effective. Under the stimulation of 17α-methyltestosterone, some gonads had a tendency to transform into testis, but not completely. There were three types of gonads in 5-month-old and four types of gonads in 12-month-old fishes, however, they all differentiated into ovaries in 15-month-old fishes. Testosterone propionate and high concentrations of 17α-methyltestosterone in pond culture induction had a good effect resulting in ①a functional pseudo-male with normal testis development that could successfully extrude semen during the breeding period, ②a pseudo-male with normal testis development, but could not extrude semen, and ③the appearance of intersexual glands. The second experiment revealed that with common fish, all-female fish embryo had normal embryonic development. The development time and morphological characteristics of each stage were similar, but the development of the all-female embryo was slightly slower than the common embryos. The gonad differentiation of the all-female embryo were normal and none differentiated into testis, which indicated that all-female could ensure the female sex without affecting the normal gonad differentiation. The correlation between body weight, length, and month-age of all-female and common fish was strong. The all-female had faster growth rate and more uniform growth specification than the common fish. Therefore, the use of testosterone propionate and high concentrations of 17α-methyltestosterone in pond culture induction could avoid complete degeneration of gonads into ovaries. The all-female embryo had the advantages of normal embryonic development and gonadal differentiation, faster growth, and uniform growth specification.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11259824PMC
http://dx.doi.org/10.1016/j.heliyon.2024.e33414DOI Listing

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