SciELO - Scientific Electronic Library Online

 
vol.9 issue3Performance of dry matter yield and its components in germoplasm of alfalfa (Medicago sativa L.)Nutritional value of Mucuna spp. seed, as a dietary complement to non ruminant and ruminant livestock. Review author indexsubject indexsearch form
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • Have no similar articlesSimilars in SciELO

Share


Revista mexicana de ciencias pecuarias

On-line version ISSN 2448-6698Print version ISSN 2007-1124

Abstract

RODRIGUEZ-MARTINEZ, Rafael et al. Reproductive efficiency of Ovsynch + CIDR in Holstein cows under a fixed time artificial insemination scheme in northern Mexico. Rev. mex. de cienc. pecuarias [online]. 2018, vol.9, n.3, pp.506-517. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v9i3.4300.

The use of Ovsynch plus controlled internal drug release of progesterone (CIDR) in high producing dairy cows was evaluated. The study was carried-out at the Comarca Lagunera (25° 44´ N, 103° 10´ W, at 1,111 m asl.) during December and January. Cows (n= 100) were pre-synchronized with two injections of PGF2α at 35 and 47 d postpartum and assigned to two treatments (n= 50 each). 1) The group OV received the Ovsynch protocol: 100 µg GnRH (i.m.; d 1), 25 mg of PGF2α (i.m.; d 7), and 100 µg GnRH (i.m.; d 9); 2) The group OV+C was subjected to the Ovsynch protocol plus a CIDR (1.38 g P4) which was removed at d 7. Cows of both groups were exposed to a fixed time artificial insemination protocol (IATF; 16 to 20 h after the last injection). Response variables included pregnancy rate, cows with repeated estrus considering two periods, ≤24 and ≥25 d after insemination, and the period to return to estrus. While no differences occurred between groups regarding pregnancy rates (OV= 28 %, OV+C= 32 %; P>0.05), the percentage of cows showing estrus after IATF differed (P<0.05) between treatments for the two studied periods (28 % vs 62 % ≤24 d; 69 % vs 35 % ≥25 d; OV and OV+C, respectively). Moreover, mean of days when cows repeated estrus was lower (P<0.05) in the OV+C group (25 ± 1.6 vs 30 ± 1.3 d). Although the Ovsynch+CIDR treatment did not improve pregnancy rate, it reduced the latency for return to estrus, emerging as an alternative to diminish the days to the next AI, and potentially improve the reproductive efficiency and the economic return of the dairy herd.

Keywords : Pregnancy; TAI; Progesterone; Return to estrus; Synchronization.

        · abstract in Spanish     · text in Spanish