Efeitos do acetato de deslorelina sobre a produção in vivo e in vitro de embriões de gatas domésticas

Abstract

Deslorelin acetate promotes a long, safe and efficient contraception; however reversibility is consider progressive and asynchronous. We aim to evaluate the effects of deslorelin acetate on in vitro and in vivo embryo production in domestic cats. For that 2 experiments were performed. Experiment 1: The objective was to investigate the effect of contraceptive treatment with deslorelin acetate in in vitro embryo production and oocyte recovery in domestic queens. Twenty one queens (Treated n=11 and Control n=10) and one tom were used. Eleven queens were treated with deslorelin acetate (4.7mg/animal) during 6 months. Thereafter all females (treated and control) were spayed and the ovaries were included in in vitro embryo production routines (PIV). Rate of COC recovery was submitted to t test. Cleavage and blastocyst rate were expressed in percentage and submitted to Fisher's exact test. All analyses were performed in GraphPad Pisma v5.0 program, P < 0.05. One female developed galactorrhoea and was removed from experimental group. In Control group we recovered 18.4±3.21 of COC I, cleavage rate was 55.97% and blastocyst rate was 33.99%.In Treated group we recovered 8.3±1.15 of COC I, cleavage rate was 60.24% and blastocyst rate was 36%. Statistical difference was only observed in COC recovery, were treated cats had fewer than control group. Although we didn't found differences on embryo production, individual variation must be considered. Experiment 2: We aimed to evaluate in vivo embryo production, trough pregnancies, and also identify estrogen (ER-α) and progesterone (PgR) receptors in uterus and FSH (FSH-R) and LH (LH-R) receptors in ovaries from queen treated with deslorelin acetate. We used 25 queens and one tom, 15 queens were treated with deslorelin acetate (4.7mg/animal) for 3 months. After that, all implants were removed and estrous and ovulation was induced. After 24hs five queens were maintained with one tom and mating was ...

O acetato de deslorelina promove uma contracepção de longa duração segura e eficaz, porém a reversibilidade espontânea é progressiva e assincrônica. O objetivo geral foi avaliar os efeitos do acetato de deslorelina sobre a produção in vivo e in vitro de embriões de gatas domésticas. Para tanto foram realizados 2 experimentos. Experimento 1: Objetivou-se avaliar a taxa de produção de embriões in vitro em gatas tratadas com acetato de deslorelina. Foram utilizadas 21 fêmeas (Tratado n=11 e Controle n=10). Onze gatas receberam um implante de deslorelina (4,7mg/animal) e o tratamento durou 6 meses. Após o tratamento, todas as fêmeas (Tratado e Controle) foram submetidas à OSH para que seus ovários fossem incluídos em rotinas de produção de embriões in vitro (PIV). A taxa de recuperação de COC foi submetida ao teste t de Student. As taxas de clivagem e blastocisto foram expressas em porcentagem e submetidas ao teste exato de Fisher. Todas as análises foram realizadas no programa GraphPad v5.0, P<0.05. Uma gata apresentou galactorréia e foi retirada do grupo experimental. Foram obtidos 184 COC grau I, a taxa de clivagem foi em média de 55,97% (total de 103 mórulas) e de blastocisto de 33,99% (total de 33 blastocistos) no grupo Controle. Já no grupo Tratado foram obtidos 83 COC grau I e a taxa de clivagem foi em média 60,24% (total de 50 mórulas) e de blastocisto foi de 36% (total de 18 blastocistos). Só houve diferença estatística entre os grupos na taxa de recuperação de COC grau I. A taxa de recuperação de COC foi menor em gatas tratadas, porém a PIV apresentou taxas similares à de fêmeas não tratadas. Devem-se considerar as variações individuais no grupo tratado. Experimento 2: Objetivou-se avaliar a produção de embriões in vivo, a taxa de concepção, bem como a presença de receptores de estrógeno e progesterona no útero, e receptores de LH e FSH em ovários de gatas submetidas ao tratamento com...