| Texto completo | |
| Autor(es): |
Pugliesi, Guilherme
[1]
;
Bisinotto, Danilo Zago
[2]
;
Mello, Barbara Piffero
[2]
;
Lahr, Fabio C.
[2]
;
Ferreira, Catia A.
[1]
;
Melo, Gabriela Dalmaso
[1]
;
Bastos, Michele Ricieri
[3]
;
Madureira, Ed Hoffmann
[1]
Número total de Autores: 8
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Sch Vet Med & Anim Sci, Dept Anim Reprod, Pirassununga, SP - Brazil
[2] Univ Sao Paulo, Sch Anim & Food Sci, Dept Vet, Pirassununga - Brazil
[3] Ourofino Saude Anim, Cravinhos - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | REPRODUCTION IN DOMESTIC ANIMALS; v. 54, n. 8, p. 1149-1154, AUG 2019. |
| Citações Web of Science: | 0 |
| Resumo | |
We aimed to evaluate the reproductive performance of Nelore lactating cows submitted to a resynchronization 12 days after timed artificial insemination (TAI) with or without a long-acting progesterone (P4-LA) treatment. Nelore cows were submitted to a P4/oestradiol-based TAI protocol (D0 = insemination). On D12, cows in the control group (n = 184) received a new P4 intravaginal device (0.96 g), whereas cows in the P4-LA group (n = 192) received the P4 device and 75 mg P4-LA. Cows identified as non-pregnant (n = 120) by regression of corpus luteum using colour Doppler ultrasonography on D20 had the P4 device removed and received 500ug of sodium cloprostenol, 1 mg of oestradiol cypionate and 300 IU of eCG and were re-inseminated on D22. There was no difference (p > 0.10) in the pregnancy rate at D20, D30 and D60 after first TAI between the control (69%, 59.7% and 57%, respectively) and P4-LA (67%, 55.7%, and 55.2%, respectively) groups. Pregnancy losses were similar between both groups (p > 0.1). For cows submitted to the second TAI, the pre-ovulatory follicle size did not differ (p > 0.1), but the oestrous detection and pregnancy rates were greater (p < 0.05) in the P4-LA group (92.2% {[}59/64] and 60.9% {[}39/64], respectively) than in controls (75% {[}42/56] and 44.6% {[}25/56]). The cumulative pregnancy rate after two TAIs did not differ (p > 0.1) between control (73.3% {[}135/184]) and P4-LA (76% {[}146/192]) groups. The use of P4-LA at 12 days after TAI potentially increases the pregnancy rates for a new early resynchronization strategy associated with the Doppler imaging for pregnancy diagnosis and results in an alternative to perform two TAIs in 22 days in beef cows. (AU) | |
| Processo FAPESP: | 15/10606-9 - Inovações no diagnóstico precoce da gestação em bovinos |
| Beneficiário: | Guilherme Pugliesi |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 16/23964-3 - Inovações no diagnóstico precoce da gestação em bovinos |
| Beneficiário: | Guilherme Pugliesi |
| Modalidade de apoio: | Bolsas no Brasil - Jovens Pesquisadores |
| Processo FAPESP: | 17/26767-7 - Eficácia do diagnóstico de gestação pela Ultrassonografia Doppler aos 20 dias pós-IATF em vacas Nelore ressincronizadas com ou sem progesterona injetável |
| Beneficiário: | Danilo Zago Bisinotto |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |