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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
17/10/2025 |
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Data da última atualização: |
17/10/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
RANGEL, P. S. C.; RODRIGUES, J. N. D.; VERGANI, G. B.; FREITAS, B. W.; BRANDÃO, F. Z.; SOUZA-FABJAN, J. M. G.; FONSECA, J. F. da. |
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Afiliação: |
PAULO SERGIO C. RANGEL, UNIVERSIDADE FEDERAL DE VIÇOSA; JULIANA N. D. RODRIGUES, UNIVERSIDADE FEDERAL RURAL DA AMAZÔNIA; GABRIEL B. VERGANI, UNIVERSIDADE ESTADUAL PAULISTA; BRUNA W. FREITAS, UNIVERSIDADE FEDERAL DE VIÇOSA; FELIPE Z. BRANDÃO, UNIVERSIDADE ESTADUAL PAULISTA; JOANNA M. G. SOUZA-FABJAN, UNIVERSIDADE ESTADUAL PAULISTA; JEFERSON FERREIRA DA FONSECA, CNPC. |
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Título: |
Effect of hCG administration at the second cloprostenol injection on the reproductive performance of Saanen goats previously exposed to 16-h photoperiod. |
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Ano de publicação: |
2025 |
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Fonte/Imprenta: |
Reproduction in Domestic Animals, v. 60, e70134, 2025. |
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DOI: |
https://doi.org/10.1111/rda.70134 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract - This study aimed to evaluate the effects of human chorionic gonadotropin (hCG) on the second prostaglandin F2α (PGF2α) injection in anestrous Saanen goats that had been previously exposed to a 16-h photoperiod. Seventy-two pluriparous goats were subjected to a 16-h photoperiod for 60 days. Ten days later, synchronisation of estrus was conducted with two injections of cloprostenol administered 11.5 days apart. At the second injection, goats received either 300 IU of hCG (hCG group) or no hCG (control group). Estrus response, ovarian structures, progesterone (P4) concentrations, and pregnancy rates were assessed. Estrus response after the second cloprostenol injection (70.8%; 51/72) was higher (p < 0.05) than that of the first injection (39.0%; 28/72; p < 0.05). Goats in the hCG group ovulated earlier (p < 0.05; 45.0 ± 5.9 h) compared with the control (72.9 ± 4.8 h), with a shorter interval between estrus and ovulation (−1.2 ± 7 h vs. 34.2 ± 3.3 h; p < 0.05). Although hCG increased the luteal area and P4 concentrations, pregnancy rate was drastically reduced (p = 0.05) in the hCG group (25.0% vs. 47.2%). Moreover, hCG reduced (p < 0.05) the incidence of premature luteal regression (11.1% vs. 30.6%). No differences were observed in follicular number or diameter between groups. It was concluded that even though hCG effectively induced ovulation and enhanced luteal function in goats during anestrus, its administration in conjunction with the second PGF2α injection may have excessively advanced ovulation, impairing estrus–ovulation synchrony, which markedly reduces pregnancy rate. Timings of hCG administration should be further explored to optimise its reproductive benefits without compromising pregnancy outcome. MenosAbstract - This study aimed to evaluate the effects of human chorionic gonadotropin (hCG) on the second prostaglandin F2α (PGF2α) injection in anestrous Saanen goats that had been previously exposed to a 16-h photoperiod. Seventy-two pluriparous goats were subjected to a 16-h photoperiod for 60 days. Ten days later, synchronisation of estrus was conducted with two injections of cloprostenol administered 11.5 days apart. At the second injection, goats received either 300 IU of hCG (hCG group) or no hCG (control group). Estrus response, ovarian structures, progesterone (P4) concentrations, and pregnancy rates were assessed. Estrus response after the second cloprostenol injection (70.8%; 51/72) was higher (p < 0.05) than that of the first injection (39.0%; 28/72; p < 0.05). Goats in the hCG group ovulated earlier (p < 0.05; 45.0 ± 5.9 h) compared with the control (72.9 ± 4.8 h), with a shorter interval between estrus and ovulation (−1.2 ± 7 h vs. 34.2 ± 3.3 h; p < 0.05). Although hCG increased the luteal area and P4 concentrations, pregnancy rate was drastically reduced (p = 0.05) in the hCG group (25.0% vs. 47.2%). Moreover, hCG reduced (p < 0.05) the incidence of premature luteal regression (11.1% vs. 30.6%). No differences were observed in follicular number or diameter between groups. It was concluded that even though hCG effectively induced ovulation and enhanced luteal function in goats during anestrus, its administration in conjunction with the second PGF2α injection may ... Mostrar Tudo |
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Palavras-Chave: |
Anestrous; Artificial photoperiod; Estrus synchronisation; HCG; Seasonal anestrus. |
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Thesagro: |
Cabra Leiteira; Caprino; Ciclo Estral; Prostaglandina; Reprodução; Sincronização do Cio. |
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Thesaurus Nal: |
Brazil; Cloprostenol; Dairy goats; Estrus synchronization; Human chorionic gonadotropin; Prostaglandin-F synthase; Reproduction; Reproductive performance; Saanen. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03176naa a2200445 a 4500
001 2179773
005 2025-10-17
008 2025 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1111/rda.70134$2DOI
100 1 $aRANGEL, P. S. C.
245 $aEffect of hCG administration at the second cloprostenol injection on the reproductive performance of Saanen goats previously exposed to 16-h photoperiod.$h[electronic resource]
260 $c2025
520 $aAbstract - This study aimed to evaluate the effects of human chorionic gonadotropin (hCG) on the second prostaglandin F2α (PGF2α) injection in anestrous Saanen goats that had been previously exposed to a 16-h photoperiod. Seventy-two pluriparous goats were subjected to a 16-h photoperiod for 60 days. Ten days later, synchronisation of estrus was conducted with two injections of cloprostenol administered 11.5 days apart. At the second injection, goats received either 300 IU of hCG (hCG group) or no hCG (control group). Estrus response, ovarian structures, progesterone (P4) concentrations, and pregnancy rates were assessed. Estrus response after the second cloprostenol injection (70.8%; 51/72) was higher (p < 0.05) than that of the first injection (39.0%; 28/72; p < 0.05). Goats in the hCG group ovulated earlier (p < 0.05; 45.0 ± 5.9 h) compared with the control (72.9 ± 4.8 h), with a shorter interval between estrus and ovulation (−1.2 ± 7 h vs. 34.2 ± 3.3 h; p < 0.05). Although hCG increased the luteal area and P4 concentrations, pregnancy rate was drastically reduced (p = 0.05) in the hCG group (25.0% vs. 47.2%). Moreover, hCG reduced (p < 0.05) the incidence of premature luteal regression (11.1% vs. 30.6%). No differences were observed in follicular number or diameter between groups. It was concluded that even though hCG effectively induced ovulation and enhanced luteal function in goats during anestrus, its administration in conjunction with the second PGF2α injection may have excessively advanced ovulation, impairing estrus–ovulation synchrony, which markedly reduces pregnancy rate. Timings of hCG administration should be further explored to optimise its reproductive benefits without compromising pregnancy outcome.
650 $aBrazil
650 $aCloprostenol
650 $aDairy goats
650 $aEstrus synchronization
650 $aHuman chorionic gonadotropin
650 $aProstaglandin-F synthase
650 $aReproduction
650 $aReproductive performance
650 $aSaanen
650 $aCabra Leiteira
650 $aCaprino
650 $aCiclo Estral
650 $aProstaglandina
650 $aReprodução
650 $aSincronização do Cio
653 $aAnestrous
653 $aArtificial photoperiod
653 $aEstrus synchronisation
653 $aHCG
653 $aSeasonal anestrus
700 1 $aRODRIGUES, J. N. D.
700 1 $aVERGANI, G. B.
700 1 $aFREITAS, B. W.
700 1 $aBRANDÃO, F. Z.
700 1 $aSOUZA-FABJAN, J. M. G.
700 1 $aFONSECA, J. F. da
773 $tReproduction in Domestic Animals$gv. 60, e70134, 2025.
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