Development of a novel 21-day reinsemination program, ReBreed21, in Bos indicus heifers.

Theriogenology
João P N AndradeMarco R B Mello

Abstract

The aim was to develop a program for resynchronization of ovulation (ReBreed21) that allowed reinsemination of non-pregnant Bos indicus heifers every 21 d using timed AI (TAI) without the need for detection of estrus. The Rebreed21 program begins 12 d after previous TAI (Day 0) by inserting an intravaginal P4 implant (Day 12) that is removed 7 d later (Day 19) combined with treatment with 300 IU of eCG. On Day 21, early pregnancy diagnosis (Doppler PD) is performed based on CL vascularity. Non-pregnant (NP) heifers immediately received AI combined with 100 μg of GnRH. The program is replicated 12 d after second TAI to produce a breeding season (BS) of 42 d with 3 potential TAIs. Two experiments were conducted as a proof of concept for this rapid rebreeding program. In Experiment 1, 76 heifers were enrolled in ReBreed21, as explained above. In Experiment 2, 300 Nellore heifers were synchronized for 1st TAI and randomly assigned to one of two groups: ReBreed21 (n = 147) or another early resynchronization procedure, Resynch14 (n = 153) with P4 implant inserted 14 d after previous TAI plus 50 mg of long-acting injectable P4; 8 d later P4 implant removed (Day 22) and early Doppler PD performed; NP heifers received 150 μg of cloprost...Continue Reading

References

Sep 1, 1989·Journal of Reproduction and Fertility·O J GintherJ P Kastelic
Feb 1, 1997·Journal of Dairy Science·J R PursleyM C Wiltbank
Nov 24, 1999·Animal Reproduction Science·M F MartinezR J Mapletoft
Jul 6, 2000·Journal of Dairy Science·F MoreiraW W Thatcher
Oct 24, 2001·Biology of Reproduction·R SartoriM C Wiltbank
Jan 5, 2002·Theriogenology·M C WiltbankR Sartori
Mar 30, 2005·Proceedings of the National Academy of Sciences of the United States of America·George A PerryThomas W Geary
Jul 26, 2005·Theriogenology·M G ColazoR J Mapletoft
Mar 5, 2008·Theriogenology·L U GimenesP S Baruselli
Mar 11, 2011·Animal Reproduction Science·R Sartori, C M Barros
Nov 28, 2013·Theriogenology·Milo C Wiltbank, J Richard Pursley
May 23, 2014·Animal : an International Journal of Animal Bioscience·G A Bó, P S Baruselli
May 18, 2016·Theriogenology·Gabriel A BóAlejo Menchaca
Aug 17, 2018·Animal Reproduction·Guilherme PugliesiMario Binelli

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