Abstract

HERNANDEZ-MARIN, José A. et al. Ovulation induction with male effect and a commercial energy tonic in prepubertal pelibuey ewes. Agrociencia [online]. 2016, vol.50, n.7, pp.811-823. ISSN 2521-9766.

In animal reproduction, natural methods like male effect (ME) and the action of neuroexcitatory amino acids accelerate puberty and induce ovulation in ewe lambs. In this study it was found that the biostimulation of the ewe and the neurotransmitter action of amino acids of a commercial energy tonic (CET, Metabolase®) may change the pulse frequency of luteinizing hormone (LH) and induce ovulation in prepubertal ewes. The objective was to evaluate the ME and CET action to induce ovulation and characterize the preovulatory peak of LH in prepubertal Pelibuey ewes. The experimental design included two factors (CET and ME) on two levels each (without: wo, and with: w). The treatments were randomized to 46 ewes: T1 (n = 12) control group: ewes without CET and without ME (woCETwoME), T2 (n=12) ewes with CET and without ME (wCETwoME), T3 (n=10) ewes without CET and with ME (woCETwME) and T4 (n=12) ewes with CET and with ME (wCETwME). Ovarian activity (OA) and the ovulation rate (OR) were evaluated by laparoscopy. The characteristics of the preovulatory peak of LH were evaluated in response to ME to confirm the first ovulation. The action of the CET, the male effect as well as their interaction, did not increase (p>0.05) the number of ovarian follicles of different diameters. The male effect and its interaction with the energy tonic increased (p≤0.05) the OR (woCETwME: 0.70 and wCETwME: 0.75). The response of the preovulatory peak of LH was similar (p>0.05) in ewes with ME with or without CET (wCETwME: 91.7 % and woCETwME: 70.0 %). The male effect and its interaction with CET induce the preovulatory LH peak and the first ovulation in prepubertal Pelibuey ewes.

Keywords : Biostimulation; neurotransmitters; Ovis aries; puberty; ovulation rate; LH.

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