Efeitos de baixas doses de cloprostenol via intramuscular ou submucosavulvar na indução do estro e taxas de prenhez em vacas Nelore

Chacur, Marcelo George Mungai; Aurélio, Paulo Tiago Ferreira; Júnior, Orivaldo Scalon; Inague, Leandro; Scalon, Luis Fernando; Kronka, Sérgio do Nascimento

doi:10.5433/1679-0359.2010v31n2p451

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Chacur et al (2010) reported that treatments with low doses of cloprostenol intramuscular (IM) or VSM may be used in estrus induction with similar pregnancy rates in in cyclic Nellore cows with a good body condition. It is possible that using this route with gonadotropins may reduce the cost of the hormones in induction protocols and in synchronizing estrus and ovulation in ewes and may promote an increase the use of artificial insemination in fixed time (TAI) transcervically in sheep, thereby optimizing the reproductive potential and increasing the genetic gain in herds.…”

Section: Introductionmentioning

confidence: 99%

Use of reduced doses of eCG applied by different routes in the TAI program in Santa Ines sheep

Antunes-Melo¹,

Oliveira²,

Oliveira³

et al. 2015

Sem. Ci. Agr.

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The aims of this study were to improve the cost-benefit ratio of the application of artificial insemination in fixed time (TAI) by the transcervical route in sheep, to test the dosage reduction and the use of the vulvar submucosa (VSM) route as an alternative for the application of equine chorionic gonadotropin (eCG) on the efficiency of the synchronization protocol and fertility to artificial insemination (AI) and to measure the level of cortisol in ewes as a result the application of this biotechnique. Blood samples were collected before AI, immediately after AI and seven days after AI. Six groups of twenty animals were used, and each group received doses of 200, 300 and 400 IU of eCG by the intramuscular route (IM) and VSM. Estrus was detected, and 48 hours later, the inseminations were performed by the transcervical route. Among the 120 treated ewes, 87.5% came in estrus. The percentage of the intrauterine deposition of semen was 88.3%. The pregnancy rate ranged from 20 to 70% between treatments, with an average of 46.66%. The VSM route was viable for the application of eCG in doses of 300 and 400 IU. The reduction in the eCG dose to 200 IU by the IM route reduces costs while maintaining the efficiency of estrus synchronization protocols and TAI with frozen semen in Santa Ines ewes. The average levels of cortisol were significant, at 1.15, 2.86 and 0.52 µg/dL according to the three collections, being higher after the animal was off the easel at the end of AI. The procedures for performing the transcervical AI technique indicate that stress in the animals produces satisfactory fertility results and a low cost in multiparous ewes of the Santa Ines breed. Key words: Application route, artificial insemination, hormones, sheep, stress ResumoOs objetivos deste trabalho foram melhorar a relação custo benefício da aplicação da técnica de inseminação artificial pela via transcervical em tempo fixo (IATF) em ovinos, testando a redução da dose e da utilização da via submucosa vulvar (SMV) como alternativa na aplicação da gonadotrofina

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Section: Introductionmentioning

confidence: 99%

Use of reduced doses of eCG applied by different routes in the TAI program in Santa Ines sheep

Antunes-Melo¹,

Oliveira²,

Oliveira³

et al. 2015

Sem. Ci. Agr.

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Cloprostenol and pregnant mare serum gonadotropin promote estrus synchronization, uterine development, and follicle-stimulating hormone receptor expression in mice

Wei¹,

Gong²,

An³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. This study investigated the effects of pregnant mare serum gonadotropin (PMSG) and cloprostenol (CLO) on estrus induction and synchronization, uterine development, and follicle-stimulating hormone receptor (FSHR) expression in mice. A total of 105 Kunming pre-puberty mice were divided into seven subgroups. Three PMSG subgroups were injected intraperitoneally with 10, 20, and 40 IU PMSG twice (on days 0 and 4), and three CLO subgroups were injected intraperitoneally with 10, 15, and 20 μg cloprostenol acetate twice (on days 0 and 4). The results showed that 93.33 and 66.67% of synchronized mice displayed estrus within 18.68-37.59 h following CLO and PMSG exposure, respectively. Estrus numbers, estrus onset time, and estrus rates in CLO and PMSG groups were greater than in control groups (CG) (P < 0.05). Uterine weights of the PMSG group were higher than 7185 Uterine FHSR expression and development ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 14 (2): 7184-7195 (2015) that of CLO and CG groups, and the uterine horn longitudinal diameters in experimental mice were greater than CG. Expression levels of FSHR proteins in CLO and PMSG groups increased slightly when compared to CG. In conclusion, CLO and PMSG administration did not clearly affect the expression of uterine FSHR proteins in mice. Moreover, PMSG and CLO treatments synchronized estrus and enhanced the uterine development of mice. The efficacy of CLO on estrus synchronization was greater than PMSG, and the effects of PMSG on uterine development were stronger than CLO. These results have important significance regarding the modulation of animal reproductive functions.

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Efeitos de baixas doses de cloprostenol via intramuscular ou submucosavulvar na indução do estro e taxas de prenhez em vacas Nelore

Cited by 2 publications

References 16 publications

Use of reduced doses of eCG applied by different routes in the TAI program in Santa Ines sheep

Use of reduced doses of eCG applied by different routes in the TAI program in Santa Ines sheep

Cloprostenol and pregnant mare serum gonadotropin promote estrus synchronization, uterine development, and follicle-stimulating hormone receptor expression in mice

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