OPTIMIZATION OF ORAL ADMINISTRATION OF 17A-METHYLTESTOSTERONE FOR MASCULINIZATION AND STERILIZATION OF RAINBOW TROUT, ONCORHYNCHUS MYKISS

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AMINI F.; TALA M.

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Journal: Journal of Veterinary Research Year:2003 | Volume:58 | Issue:3 Page(s): 235-240

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Title

OPTIMIZATION OF ORAL ADMINISTRATION OF 17A-METHYLTESTOSTERONE FOR MASCULINIZATION AND STERILIZATION OF RAINBOW TROUT, ONCORHYNCHUS MYKISS

Author(s)

AMINI F. | TALA M. | Issue Writer Certificate

Keywords

RAINBOW TROUTQ2

ONCORHYNCHUS MYKISSQ4

SEX REVERSALQ4

MASCULINIZATIONQ4

STERILIZATIONQ4

17A-METHYLTESTOSTERONEQ4

Abstract

Objective: To optimize the dose and rout of administration of 17A-METHYLTESTOSTERONE for MASCULINIZATION and STERILIZATION of RAINBOW TROUT.Animals: RAINBOW TROUT, ONCORHYNCHUS MYKISS.Procedure: Oral administration of 17A-METHYLTESTOSTERONE in11 treatments as follows: in A1, A2, A6 and A7 treatments 0.5, 1, 2 and 3 ppm, respectively, all starting from active feeding of larvae for 60 days; in A3 and A8 treatments land 3 ppm, respectively, both starting from active feeding of larvae for 90 days; in A4 and A9 treatments 1 and 3 ppm, respectively, starting two weeks after active feeding of larvae for 60 days; in A5 and A10 treatments 1 and 3 ppm, respectively, starting four weeks after active feeding of larvae for 60 days; and in A11 treatment 30 ppm starting from active feeding of larvae for 120 days as well as control group with no hormonal treatment. Twenty fish from each treatment and control groups were examined histologically at the age of 11 months to determine the sex ratio including female, male, intersex and sterile fish.Statistical analysis: Sex ratios and growth rates were analyzed using chi square and ANOVA, respectively and the mean survival rates were comparal by student "t" test.Results: In sample taken from A1 treatment 100% of fish were males. Other samples showed a variety of results (percentage of males is shown in brackets): A2 (90%), A6 (95%), A3 (80%), A4 (80%), A9 (68%), A7 (65%), A8 (50%), A5 (45%), A10 (45%). In A11 treatment no males were found. All treatments adopted for MASCULINIZATION except for A5 and A10 changed the sex ratio highly significantly (P<0.001) in favor of males. In A11 treatment 90% of the examined fish were sterilized which was deviated from the control group significantly (P<0.001). No significant differences were detected in growth of fisch taken from the treatment groups compared to the control group.Conclusion: According to histological evidence and statistical analysis of data as well as considering the minimum usage of hormone it can be concluded that the oral administration of 0.5 ppm 17A-METHYLTESTOSTERONE starting from active feeding of RAINBOW TROUT larvae for 60 days was determined as to be the optimum treatment.

Cites

بررسی امکان ایجاد جنس تمام نر در ماهی گوپی Poecilia reticulate توسط هورمون 17- آلفا متیل تستوسترون

References

بررسی ایجاد تغییر جنسیت و عقیمی در ماهی کپور معمولی (Cyprinus carpio Linne) به وسیله هورمون 17 آلفا - متیل تستوسترون

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APA: Copy

AMINI, F., & TALA, M.. (2003). OPTIMIZATION OF ORAL ADMINISTRATION OF 17A-METHYLTESTOSTERONE FOR MASCULINIZATION AND STERILIZATION OF RAINBOW TROUT, ONCORHYNCHUS MYKISS. JOURNAL OF VETERINARY RESEARCH, 58(3), 235-240. SID. https://sid.ir/paper/34690/en

Vancouver: Copy

AMINI F., TALA M.. OPTIMIZATION OF ORAL ADMINISTRATION OF 17A-METHYLTESTOSTERONE FOR MASCULINIZATION AND STERILIZATION OF RAINBOW TROUT, ONCORHYNCHUS MYKISS. JOURNAL OF VETERINARY RESEARCH[Internet]. 2003;58(3):235-240. Available from: https://sid.ir/paper/34690/en

IEEE: Copy

F. AMINI, and M. TALA, “OPTIMIZATION OF ORAL ADMINISTRATION OF 17A-METHYLTESTOSTERONE FOR MASCULINIZATION AND STERILIZATION OF RAINBOW TROUT, ONCORHYNCHUS MYKISS,” JOURNAL OF VETERINARY RESEARCH, vol. 58, no. 3, pp. 235–240, 2003, [Online]. Available: https://sid.ir/paper/34690/en

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