Abstract

ERBITI, F.; LISSARRAGUE, C.; CABODEVILA, J.  and  CALLEJAS, S.S.. Efecto de algunas variables sobre la preñez de vaquillonas post-inseminación artificial a tiempo fijo. Rev. vet. [online]. 2018, vol.29, n.1, pp.35-39. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.2912788.

The objective of the present work was to evaluate the effect of treatment of estrus cycle control (Co-Synch 5 days; J-Synch or Device by 7 days), reproductive status (cyclic or anestrus) and equine chorionic gonadotropin (eCG) on pregnancy rate after fixed time artificial insemination (FTAI). Angus heifers, 20-22 age (n=336) were assigned to Co- Synch 5 days: on day 0 intravaginal device IVD 0.558 g progesterone was inserted with an injection of 0.105 mg of busereline acetate. On day five IVD were removed and injected with 0.150 mg of D-Cloprostenol and assigned to injected o not with 300 IU of eCG. FTAI was performed at 56 h after IVD removal and all cows were administered 10.5 mg of busereline acetate at these time. J-Synch: on day 0, IVD was inserted with an injection of 2 mg of estradiol benzoate. On day 6, IVD was removed and injected with 0.150 mg of D-Cloprostenol and assigned to injected or not with 300 IU of eCG. Device by 7 days: on day 0, IVD was inserted with an injection of 2 mg of estradiol benzoate. On day 7, IVD was removed and injected with 0.150 mg of D-Cloprostenol and 1 mg of estradiol cipionate, and assigned to injected o not with 300 IU of eCG. Gestation diagnosis were performed at 30 days after FTAI. Treatment of estrus cycle control (Co-Synch 5 days: 38.1a; J-Synch: 55.5b and Device by 7 days: 61.1b), reproductive status (cyclic: 58.7%; superficial anestrus: 42.2%) and eCG administration (Yes: 59.2% and Not: 43.7%) affect pregnancy rate (p<0.01). In conclusion treatment of estrus cycle control, reproductive status and eCG administration, affect the pregnancy rate

Keywords : heifers; hormonal treatment; reproductive state; eCG administration; pregnancy post FTAI.

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