Data/hora: 19/06/2024 04:33:46

Biblioteca(s): | Embrapa Pecuária Sudeste.
Data corrente: | 27/11/2020
Data da última atualização: | 27/11/2020
Autoria: | VERGANI, G. B.; FONSECA, J. F. da; TREVIZAN, J. T.; PEREIRA, V. S. do A.; GARCIA, A. R.; BRANDÃO. F. Z.; SOUZA-FABJAN, J. M. G.; OLIVEIRA, M. E. F.
Afiliação: | GABRIEL BRUN VERGANI, UNESP; JEFERSON FERREIRA DA FONSECA, CNPC; JULIANE TERAMACHI TREVIZAN, UNESP; VERONICA SCHINAIDER DO A PEREIRA, CPPSE; ALEXANDRE ROSSETTO GARCIA, CPPSE; FELIPE ZANDONADI BRANDÃO, UFF; JOANNA MARIA GONÇALVES SOUZA-FABJAN, UFF; MARIA EMILIA FRANCO OLIVEIRA, UNESP.
Título: | Luteotropic effects of human chorionic gonadotropin administered 7.5 days after synchronous estrous induction in Morada Nova ewes.
Ano de publicação: | 2020
Fonte/Imprenta: | Animal Reproduction Science, v. 223, article 106644, Dec. 2020.
DOI: | https://doi.org/10.1016/j.anireprosci.2020.106644
Idioma: | Inglês
Conteúdo: | Abstract: This study was conducted in ewes to assess effects of human chorionic gonadotropin (hCG) administration after imposing an estrous induction treatment regimen. Ewes (n = 115) were treated with a 60 mg medroxyprogesterone-intravaginal-sponge for 6 d plus 200 IU of equine chorionic gonadotropin (eCG) im and 37.5 ?g d-cloprostenol im 36 h before sponge removal (Day 0). After natural mating, ewes having at least one corpus luteum (CL; n = 108) were administered either 1 mL of saline (G-Control; n = 53) or 300 IU of hCG (G-hCG; n = 55) on Day 7.5 after sponge removal (Day 0). Ovarian ultrasonography and blood collection were performed on Days 7.5, 13.5, 17.5, 21.5, and 30.5. Accessory CL (aCL) were observed in 81.5 % (G-hCG) and 0.0 % (G-Control) of ewes (P = 0.0001). Diameter, area, and volume of luteal tissue were greater (P < 0.05) in G-hCG from Day 13.5 to 30.5. Progesterone (P4) concentrations were greater (P < 0.05) on Days 13.5, 17.5, 21.5 and 30.5 for ewes of the G-hCG group. Pregnancy percentage was similar (P = 0.25) between groups [47.1 % (G-control) compared with 60.0 % (G-hCG)], although total number of lambs produced by estrous synchronized ewes was greater (P = 0.005) in ewes of the G-hCG group (90.9 % compared with 66.0 %). In conclusion, hCG administration 7.5 days after sponge removal from Morada Nova ewes during the non-breeding season is an effective treatment to induce aCL formation, improve luteal tissue biometry and P4 concentrations, and to enhance the total number of lambs born.
Palavras-Chave: | Accessory corpora lutea; HCG; Luteal vascularization; Oestrous cycle; Ovarian ultrasonography.
Thesagro: | Ciclo Estral; Corpo Lúteo; Ovino; Progesterona; Reprodução Animal.
Thesaurus Nal: | Animal reproduction; Estrous cycle; Progesterone; Sheep.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Pecuária Sudeste (CPPSE)
Exemplares: | CPPSE - (25171-1) - UPC - AP - DD - PROCI-2020.00085 - VER - 2020.00136 - DIS