Lutropin (r-hLH) administration and its response on ovulation rate and viable embryos in Pelibuey sheep
Journal: REVISTA MVZ CÓRDOBA (Vol.28, No. 3)Publication Date: 2023-12-30
Authors : Alejandro García-Salas; Juan Salazar-Ortiz; Joel Ventura-Ríos; José C. Escobar-España; Camelia A. Herrera-Corredor; César Cortez-Romero;
Page : 1-7
Keywords : CIDR; embryo; oestrus; LH; super-ovulation;
Abstract
Objective. To evaluate the influence of lutropin alfa (recombinant human LH, r-hLH) administered at 12 and 24 h post progesterone device withdrawal (CIDR) on the response of hours to onset of estrus (OE), ovulatory rate (OR), unfertilized oocytes (UNO), transferable embryos (TE), quality 1 embryos (Q1E) and plasma LH levels, in a pFSH-based superovulation protocol in Pelibuey sheep. Materials and methods. Eighteen Pelibuey sheep were used and randomly distributed into three groups (n=6): T1 (200 mg FSHp-Folltropin®); T2 (200 mg FSHp + 75 IU r-hLH at 12 h post CIDR withdrawal) and T3 (200 mg pFSH + 75 IU r-hLH at 24 h post CIDR withdrawal). Results. No significant differences were found between OE and OR. UNO was higher (p<0.05) in T2 (5.0±2.3) compared to T1 (0.8±0.6) and T3 (1.3±0.7). The number of Q1E was higher (p<0.05) in T3 (3.1±1.1) compared to T1 (1.1±0.3) and T2 (0.6±0.5) and for TE was higher (p<0.05) for T3 (6.6±0.9) relative to T2 (2.0±1) and T1 (4.0±0.6). Conclusions. The application of r-hLH 24 h after removal of CIDR increases plasma LH levels, in effect, decreasing the amount of UNO, improving the quantity and quality of TE in Pelibuey sheep.
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