Data/hora: 04/06/2024 15:05:57

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 23/08/2023
Data da última atualização: | 23/08/2023
Autoria: | RODRIGUES, J. N. D.; GUIMARÃES. J. D.; RANGEL, P. S. C.; OLIVEIRA, M. E. F.; BRANDÃO, F. Z.; BARTLEWSKI, P. M.; FONSECA, J. F. da.
Afiliação: | JULIANA NASCIMENTO DUARTE RODRIGUES, UNIVERSIDADE FEDERAL DE VIÇOSA, UNIVERSIDADE FEDERAL RURAL DA AMAZÔNIA; JOSÉ DOMINGOS GUIMARÃES, UNIVERSIDADE FEDERAL DE VIÇOSA; PAULO SERGIO CERQUEIRA RANGEL, UNIVERSIDADE FEDERAL DE VIÇOSA; MARIA EMILIA FRANCO OLIVEIRA, UNIVERSIDADE ESTADUAL PAULISTA; FELIPE ZANDONADI BRANDÃO, UNIVERSIDADE FEDERAL FLUMINENSE; PAWEL MIECZYSLAW BARTLEWSKI, UNIVERSITY OF GUELPH; JEFERSON FERREIRA DA FONSECA, CNPC.
Título: | Ovarian function and pregnancy rates in dairy goats that received 300 IU of human chorionic gonadotropin (hCG) intravaginally at the time of artificial insemination.
Ano de publicação: | 2023
Fonte/Imprenta: | Small Ruminant Research, v. 227, e107061, Oct. 2023.
DOI: | https://doi.org/10.1016/j.smallrumres.2023.107061
Idioma: | Inglês
Conteúdo: | Abstract: Two experiments were carried out to evaluate the effects of administering 300 IU hCG intravaginally (i.vag.) at the time of artificial insemination (AI) on ovulatory response, luteal function and pregnancy rates in cyclic Alpine (A) and Saanen (S) goats. All animals received two i.m. injections of 37.5 ?g of d-cloprostenol (Prolise®; Tecnopec, São Paulo, SP, Brazil) at 11.5-day (Experiments 1 and 2) or 7.5-day intervals (Experiment 2). One day after the onset of estrus (day of AI=D0), the goats were randomly allocated to one of the two groups that received: 300 IU hCG (Vetecor®; Hertape-Calier, São Paulo, SP, Brazil) i.vag. (G-hCG; Experiment 1: n = 12 A; Experiment 2: n = 80 A + 63 S) or 0.3 mL or saline solution i.vag. (G-Control; Experiment 1: n = 12 A; Experiment 2: n = 82 A + 65 S). Blood samples for measurements of circulating progesterone concentrations were drawn on both days of d-cloprostenol injections and on D3, D7, D10, D13 and D21 (Experiment 1). Transrectal ovarian ultrasonography was done on D7, D10, D13, D17 and D21 (Experiment 1), and pregnancy detection was performed on D60 (Experiment 2). In Experiment 1, there were no differences (P > 0.05) in the mean diameter of ovulatory follicles, timing and number of ovulations, and incidence of early luteal regression between the two groups of goats. However, the total luteal area on D17 and D21 and luteal vascularization on D10 and D13 were higher (P < 0.05) in G-hCG compared with G-Control does. In Experiment 2, the pregnancy rate was higher (P < 0.05) in G-hCG compared with G-Control goats (80.4% compared with 67.3%, respectively). Human chorionic gonadotropin (300 IU) given i.vag. at the time of AI did not alter ovulatory response or progesterone secretory ability of resultant corpora lutea nor did it completely prevent premature luteal regression, but it increased the luteal area and luteal vascularization as well as the conception rate in dairy goats (the latter by 13.1%).
Palavras-Chave: | Época de reprodução; HCG; Ovary; Synchronized females.
Thesagro: | Cabra Leiteira; Caprino; Corpo Lúteo; Eficiência Reprodutiva; Inseminação Artificial; Ovário; Prenhez; Reprodução; Sincronização do Cio; Ultrassom.
Thesaurus Nal: | Animal ovaries; Artificial insemination; Breeding season; Corpus luteum; Dairy goats; Estrus synchronization; Human chorionic gonadotropin; Pregnancy rate; Progesterone; Reproduction; Reproductive performance; Ultrasonography.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (40607-1) - UPC - AP - DD -  -  -  - DIS