Data/hora: 21/06/2024 03:33:44

Biblioteca(s): | Embrapa Caprinos e Ovinos; Embrapa Gado de Leite.
Data corrente: | 19/08/2020
Data da última atualização: | 09/08/2021
Autoria: | CARVALHO-DE-PAULA, C. J.; SOUZA-FABJAN, J. M. G.; GONÇALVES, J. D.; DIAS, J. H.; SOUZA, G. N. de; OLIVEIRA, M. E. F.; FONSECA, J. F. da.
Afiliação: | CLEBER JONAS CARVALHO-DE-PAULA, Universidade Federal Fluminense; JOANNA MARIA GONÇALVES SOUZA-FABJAN, Universidade Federal Fluminense; JOEDSON DANTAS GONÇALVES, Universidade Estadual Paulista; JENNIFFER HAUSCHILDT DIAS, Universidade Federal de Viçosa; GUILHERME NUNES DE SOUZA, CNPGL; MARIA EMILIA FRANCO OLIVEIRA, Universidade Estadual Paulista; JEFERSON FERREIRA DA FONSECA, CNPC.
Título: | Effect of a 12-h increment in the short-term treatment regimen on ovarian status, estrus synchrony, and pregnancy rate in artificially inseminated dairy goats.
Ano de publicação: | 2020
Fonte/Imprenta: | Animal Reproduction Science, v. 221, e106571, 2020.
DOI: | https://doi.org/10.1016/j.anireprosci.2020.106571
Idioma: | Inglês
Conteúdo: | Abstract: This study was conducted to assess effects of two hormonal treatments on ovarian follicular status, estrous synchrony and fertility in dairy goats during the non-breeding season when duration of progestogen device use varied by 12h. In both experiments, does were administered 60?mg of medroxyprogesterone acetate via intravaginal devices, respectively, for 6 and 6.5 d (G6 and G6.5). At 24 or 36?h before device removal, 200 IU of eCG im and 30??g?d-cloprostenol im were administered. In Experiment 1 (n = 24), data related to sexual behavior and that were collected using ovarian ultrasonography were recorded, and in Experiment 2 (n?=?83) fertility was assessed after Flexible Time Artificial Insemination (FxTAI). The interval from device removal to estrus was shorter (P < 0.05) after imposing the G6.5 treatment regimen. Diameter of largest and second-largest ovarian follicles and interval from device removal to ovulation were similar (P> 0.05) between groups. The does treated with the G6.5 hormonal regimen had greater estrous synchrony, associated with greater development of largest follicles at the time of device removal, which might have led to a lesser fertility rate (P > 0.05). Conversely, treatment with the G6 hormonal regimen resulted in a greater conception rate. In conclusion, increasing time the intravaginal device is inserted from 6 to 6.5 d resulted in greater estrous synchrony, advanced ovarian follicular development, abnormal CL function and lesser pregnancy rates in artificially inseminated dairy goats when there were treatments during the non-breeding season.
Palavras-Chave: | AI; Corpora lutea; Dinâmica folicular; Follicular dynamics; Taxa de prenhez; Ultrasound.
Thesagro: | Cabra Leiteira; Caprino; Ciclo Estral; Corpo Lúteo; Fertilidade; Inseminação Artificial; Prenhez; Progesterona; Reprodução Animal; Sincronização do Cio; Ultrassom.
Thesaurus Nal: | Anestrus; Animal reproduction; Artificial insemination; Estrous cycle; Female fertility; Medroxyprogesterone; Synthetic progestogens; Ultrasonography.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Gado de Leite (CNPGL)

Exemplares:

CNPC - (39622-1) - UPC - AP - DD -  -  -  - DIS
CNPGL - (25151-1) - UPC - AP - DD -  -  -  - DIS