Efeito de diferentes indutores hormonais sobre o processo de maturação final e ovulação em Leporinus macrocephalus
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2013-07-12
Autores
Pereira, Thiago Scremin Boscolo [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste estudo foi avaliar o efeito de diferentes indutores hormonais na evolução do processo de maturação final e ovulação em Leporinus macrocephalus. Os animais (n = 42) foram submetidos à reprodução induzida através de injeções intramusculares dos seguintes hormônios: extrato bruto de hipófise de carpa (EBHC) aplicado em duas doses (0,5 e 5,0 mg kg-1 com intervalo de 12 h entre as aplicações); hormônio liberador de gonadotrofina na forma líquida (mGnRHa – L) aplicado em dose única (0,5 mg kg-1); hormônio liberador de gonadotrofina na forma sólida (mGnRHa – S) aplicado em dose única (0,5 mg kg-1) e gonadotrofina coriônica humana (hCG) aplicado em duas doses (5 e 10 UI g-1 com intervalo de 12 h entre as aplicações). A administração de EBHC promoveu altas taxas de fertilização (63,57%) e eclosão (59,07%), porém apenas 71,4% das fêmeas ovularam. Por outro lado, o mGnRHa – S promoveu elevado percentual de desova (100%), taxas de fertilização (93,75%) e eclosão (89,15%). O mGnRHa – L apesar de ter causado 100% de ovulação, proporcionou baixas taxas de fertilização (6,25%) e eclosão (0%). Já o animais induzidos com hCG não ovularam (0%). A indução a desova com mGnRHa – L e hCG causou uma rápida elevação na concentração plasmática dos esteroides gonadais (E2 e 17α – OHP) após a primeira dose. Por outro lado, nos tratamentos EBHC e mGnRH – S observamos um aumento progressivo e regular nos níveis dos esteroides. O EBHC, permaneceu com um percentual elevado de ovócitos maduros com quebra da vesícula germinativa (GVBD) remanescente nos ovários (22,01%) e que não atingiram a ovulação. Por outro lado, a frequência de folículos pós – ovulatórios (FPO) nos tratamentos mGnRHa – L (26,69%) e mGnRHa – S (52,89%) aumentou após uma única dose hormonal. Assim, concluímos que a primeira dose de EBHC é responsável pela maturação....
The aim of this study was to evaluate the effect of different hormonal inductors in the progress of final maturation and ovulation in Leporinus macrocephalus. The animal ( n = 42) were subjected to induced reproduction through intramuscular injections of following hormones: carp pituitary extract (CPE) injected in two doses (0,5 and 5,0 mg kg-1 with a 12 h interval between the doses); gonadotropin releasing hormone in liquid form (mGnRHa - L) injected with a single dose; gonadotropin releasing hormone in solid form (mGnRHa - S) injected with a single dose and human chorionic gonadotropin (hCG) injected in two doses (5 and 10 UI g-1 with a 12 h interval between the doses). The administration of CPE promoted high fertilization (63.57%) and hatching rate (59.07%), but only 71.4% of the females ovulated. On the other hand, mGnRHa - S promoted high spawning percentage (100%), fertilization (93.75%), and hatching (89.15%). The mGnRHa - L although it caused a 100% ovulation, resulted low fertilization (6.25%), and hatching rates (0%). The induced with hCG cannot cause the ovulation (0%). Induction spawning with mGnRHa - L and hCG caused a rapid increase in plasma concentrations of gonadal steroids (E2 and 17α - OHP) after the first dose. However, in animals induced with CPE and mGnRH - S observed a progressive increase and steady in steroid levels. The treatment CPE, despite have promoted high rates of fertilization and hatching, remained with a high percentage of mature oocytes with germinal vesicle breakdown (GVBD) remaining in the ovaries (22.01%) and who did not achieve ovulation. On the other hand, there was an increase in the frequency of follicles post - ovulatory (FPO) in the treatment mGnRHa - L (26.69%) and mGnRHa - S (52.89%) after administration of a single dose hormonal. Thus, we conclude that the first dose CPE is responsible for the final maturation and second dose by the ovulation ...
The aim of this study was to evaluate the effect of different hormonal inductors in the progress of final maturation and ovulation in Leporinus macrocephalus. The animal ( n = 42) were subjected to induced reproduction through intramuscular injections of following hormones: carp pituitary extract (CPE) injected in two doses (0,5 and 5,0 mg kg-1 with a 12 h interval between the doses); gonadotropin releasing hormone in liquid form (mGnRHa - L) injected with a single dose; gonadotropin releasing hormone in solid form (mGnRHa - S) injected with a single dose and human chorionic gonadotropin (hCG) injected in two doses (5 and 10 UI g-1 with a 12 h interval between the doses). The administration of CPE promoted high fertilization (63.57%) and hatching rate (59.07%), but only 71.4% of the females ovulated. On the other hand, mGnRHa - S promoted high spawning percentage (100%), fertilization (93.75%), and hatching (89.15%). The mGnRHa - L although it caused a 100% ovulation, resulted low fertilization (6.25%), and hatching rates (0%). The induced with hCG cannot cause the ovulation (0%). Induction spawning with mGnRHa - L and hCG caused a rapid increase in plasma concentrations of gonadal steroids (E2 and 17α - OHP) after the first dose. However, in animals induced with CPE and mGnRH - S observed a progressive increase and steady in steroid levels. The treatment CPE, despite have promoted high rates of fertilization and hatching, remained with a high percentage of mature oocytes with germinal vesicle breakdown (GVBD) remaining in the ovaries (22.01%) and who did not achieve ovulation. On the other hand, there was an increase in the frequency of follicles post - ovulatory (FPO) in the treatment mGnRHa - L (26.69%) and mGnRHa - S (52.89%) after administration of a single dose hormonal. Thus, we conclude that the first dose CPE is responsible for the final maturation and second dose by the ovulation ...
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Palavras-chave
Peixe - Reprodução, Reprodução animal - Aspectos endocrinos, Esteróides, Fishes
Como citar
PEREIRA, Thiago Scremin Boscolo. Efeito de diferentes indutores hormonais sobre o processo de maturação final e ovulação em Leporinus macrocephalus. 2013. xix, 45 p. Tese (doutorado) - Universidade Estadual Paulista, Centro de Aquicultura, 2013.