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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A novel strategy for resynchronization of ovulation in Nelore cows using injectable progesterone (P4) and P4 releasing devices to perform two timed inseminations within 22 days

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: REPRODUCTION IN DOMESTIC ANIMALS; v. 54, n. 8, p. 1149-1154, AUG 2019.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 15/10606-9 - Innovations in the early pregnancy diagnosis in cattle
Grantee:Guilherme Pugliesi
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 16/23964-3 - Innovations in early pregnancy diagnosis in cattle
Grantee:Guilherme Pugliesi
Support Opportunities: Scholarships in Brazil - Young Researchers