Animal Production Science Animal Production Science Society
Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Efficiency of mating, artificial insemination or resynchronisation at different times after first timed artificial insemination in postpartum Nellore cows to produce crossbred calves

Walvonvitis Baes Rodrigues A , Jean do Prado Jara B , Juliana Correa Borges A , Luiz Orcirio Fialho de Oliveira A , Urbano Pinto Gomes de Abreu A , Natalia Albanese Anache C , Karine Casanova da Silva C , Alexandre de Oliveira Bezerra C , Christopher Junior Tavares Cardoso C and Eriklis Nogueira A C D
+ Author Affiliations
- Author Affiliations

A Embrapa Pantanal, Rua 21 de Setembro, 1880, 79320-900, Corumbá – MS – Brazil.

B Uniderp Anhanguera, Rua Alexandre Herculano, 1400, 79035-470 Campo Grande – MS – Brazil.

C Programa de Pós-Graduação em Ciências Veterinárias, UFMS – Universidade Federal de Mato Grosso do Sul, Av. Senador Felinto Muller, 2443, 79070-900 Campo Grande – MS – Brazil.

D Corresponding author. Email: eriklis.nogueira@embrapa.br

Animal Production Science - https://doi.org/10.1071/AN17466
Submitted: 12 July 2017  Accepted: 13 November 2017   Published online: 17 January 2018

Abstract

The objective of this trial was to evaluate different post-timed artificial insemination (TAI) reproductive managements in postpartum beef cows to produce crossbred calves from artificial insemination (AI). Nellore cows (n = 607), with 45 days postpartum, were inseminated at a fixed time, using a protocol that included an intravaginal progesterone-releasing device along with oestradiol benzoate, prostaglandin, equine chorionic gonadotropin, and oestradiol cypionate, followed TAI 48 h post-device removal. Four post-TAI treatments were evaluated: in CONTROL (T1, n = 161), cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). In OBSERVATION (T2, n = 132), heat detection was performed for 15–25 days post-TAI, followed by AI. In RESYNC22 (T3, n = 157) and RESYNC30 (T4, n = 157), resynchronisation started after 22 or 30 days, following second TAI at Day 32 or 40 days after first TAI. In T2, T3 and T4, after the second AI, cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). The pregnancy rate (PR) for the first TAI did not differ (54.6%, 53.0%, 59.2%, and 51.6% for CONTROL, OBSERVATION, RESYNC 22, and RESYNC 30, respectively; P = 0.66), and no difference was observed for the second TAI (RESYNC 22 = 45.31% and RESYNC30 = 46.05%; P = 0.137), in the PR at the end of the breeding season (86.33%, 86.36%, 78.98%, and 81.52%, P = 0.43), or embryonic losses (4.54%, 2.85%, 6.45% and 7.40%, respectively; P = 0.61), but the percentage of crossbred pregnancy was higher in groups with resynchronisation (RESYNC22 and RESYNC30) than CONTROL and OBSERVATION (98.38%, 90.62%, 63.30%, 78.95%, P < 0.001). In conclusion, resynchronisation programs of 22 or 30 days are more efficient to produce AI products, and the final pregnancy rate is similar among the treatments, differing only in the amount of calves produced by AI.

Additional keywords: fertility, management, pregnancy.


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