Abstract

LEONETTI UNZUE, Tomas et al. Effect of a vitamin-mineral complex on pregnancy after fixed time artificial insemination. Rev. investig. vet. Perú [online]. 2019, vol.30, n.4, pp.1811-1815. ISSN 1609-9117.  http://dx.doi.org/10.15381/rivep.v30i4.17170.

The aim of this study was to evaluate the effect of a parenteral treatment with vitamins and minerals on the percentage of pregnancy in heifers after a fixed-time artificial insemination (FTAI) scheme as well as to determine possible relationships between the response to the treatment and the Reproductive Tract Score (RTS). A total of 360 heifers from three farms were used (A, B and C). On day 0, the animals were divided into twogroupsaccordingto theirRTS.Agroupwassupplemented viai.m.withacommercial vitamin-mineral complex (V+M Group) and the other one remained as a control group. Simultaneously, an intravaginal device with 0.5 g of progesterone was placed and 2 mg of estradiol benzoate was injected. On day 7, the device was removed and 500 µg of D(+) cloprostenol and 1 mg of estradiol cypionate were injected. The FTAI was performed between 48 and 56 h after the device was removed, using frozen semen in A and C, and two bulls in B. Pregnancy diagnosis was performed by ultrasonography at 32 days of the FTAI.The pregnancyrate was56.9%inAand 52.0% in C,withoutsignificant difference between treatments, but it was 76.6% for V+M and 57.8% for the control in farm B (p=0.03). There was no effect of RTS and RTS-Treatment interaction. In conclusion, vitamin/mineral supplementation applied parenterally at the beginning of an FTAI protocol in 15-month heifers has variable results.

Keywords : heifers; TRS; FTAI; vitamins; minerals.

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