Use of eCG antiserum improves the ovarian response of ewes with eCG

Ungerfeld, Rodolfo; Ibarra, D.; Rubianes, E.

doi:10.1016/0093-691x(95)92496-v

Cited by 2 publications

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“…Some authors described inconsistent stimulatory effects of eCG and have related such marginal response of eCG to its long half-life (Murphy and Martinuk, 1991), causing exaggerated follicular development, failure of ovulation (Gonzalez et al, 1994;Rubianes et al, 1996;Sudano et al, 2009;Ungerfeld et al, 1995), with continued follicular growth up to embryo collection and abnormal endocrine profiles coupled with poor embryo quality (Mikel-Jenson et al, 1982;Saumande et al, 1978Saumande et al, , 1984. In the present study, ovulation failure occurred in one cow synchronized with two once-used implants, which was excluded from the data set for statistical analysis for such variables as ova/embryos recovered and transferable embryos.…”

Section: Resultsmentioning

confidence: 99%

Reuse of norgestomet implants in an eCG-based superovulation protocol administered to Nelore (Bos taurus indicus) cows

et al. 2011

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This study assessed the reuse of norgestomet implants in Nelore cows that were superstimulated with eCG. In a crossover design trial, eight cows were randomly divided into two experimental groups and twice superstimulated: Group 1half of the cows received a new norgestomet implant and 2 mg estradiol benzoate (EB) on Day 0; Group 2remaining cows received two once-used norgestomet implants and 2 mg EB also on Day 0. On Day 4 all cows received a single dose of 2000 IU eCG, and on Day 6 cows were treated with two doses of PGF 2α 12 h apart. Ovulation was induced with 12.5 mg pLH 12 h after implant withdrawal (on Day 7), and fixedtime artificial inseminations were carried out 12 and 24 h later. Seven days after pLH injection embryos were recovered and blood samples were taken to determine circulating progesterone. Ultrasound examinations were performed at pLH administration and at embryo recovery. The number of large follicles (≥8 mm) was greater (Pb 0.05) in Group 1 (17.1 ± 1.8) than in Group 2 cows (9.7± 1.6). The mean number of corpora lutea was greater (Pb 0.05) for Group 1 (13.8 ± 1.8) as compared to Group 2 cows (5.4± 1.0) and the percentage of large follicles that ovulated following pLH administration also differed (Pb 0.05) between treatments (80.3% and 53.8% for cows in Groups 1 and 2, respectively). However, no differences (PN 0.05) were found between treatments (respectively, for Group 1 and Group 2 cows) in the follicle diameter (10.5 ± 1.6 and 10.2± 1.7 mm), corpus luteum (CL) diameter (15.7 ± 1.8 and 14.4± 1.7 mm), CL volume (2232 ± 1356 and 1893± 1828 mm 3), ova/embryos recovered (6.3± 1.1 and 4.0 ± 1.9), transferable embryos (4.0± 1.8 and 2.5 ± 1.0) and plasma progesterone concentration (36.1 ± 8.3 and 35.1± 6.9 ng/mL). In conclusion, the stimulatory effects on the ovaries provided by the use of two onceused implants were less intense than the ones verified after using a new implant.

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