Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence

Huanca, W.; Cordero, A.; Huanca, T.; Cárdenas, O.; Adams, G.P.; Ratto Fuster, Marcelo

Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence

dc.contributor.author	Huanca, W.
dc.contributor.author	Cordero, A.
dc.contributor.author	Huanca, T.
dc.contributor.author	Cárdenas, O.
dc.contributor.author	Adams, G.P.
dc.contributor.author	Ratto Fuster, Marcelo
dc.date	2009
dc.date.accessioned	2012-02-09T21:23:30Z
dc.date.available	2012-02-09T21:23:30Z
dc.date.issued	2012-02-09
dc.description.abstract	The objective of the study was to compare the ovulatory response and embryo production in llamas (Lama glama) treated with a single dose of equine chorionic gonadotropin (eCG) alone or combined with intravaginal medroxyprogesterone acetate (MPA) at the time of follicular wave emergence. Llamas with a growing follicle ≥7 mm in diameter were assigned to one of the following groups: (1) Control (n = 28): Nonstimulated llamas were mated and embryos were collected 7 d after mating. (2) eCG (n = 32): Llamas were given 5 mg luteinizing hormone (LH) (Day 0) to induce ovulation, 1000 IU eCG on Day 2, a luteolytic dose of prostaglandin F2α on Day 6, mating on Day 7, and embryo collection on Day 14. (3) eCG+MPA (n = 34): Llamas were treated as those in the eCG group, but a sponge containing 60 mg MPA was placed intravaginally from Days 2 to 6. Llamas that did not respond to synchronization or superstimulation were excluded, leaving data from n = 26, 26, and 27 in the control, eCG, and eCG+MPA groups, respectively, for statistical analysis. The mean (±SD) number of follicles > 7 mm at the time of mating was greatest in the eCG group, intermediate in the eCG+MPA group, and lowest in the control group (16.6 ± 5.3, 12.9 ± 3.7, and 1.0 ± 0.0, respectively, P < 0.001). The number of corpora lutea was similar between eCG and eCG+MPA groups (10.1 ± 2.9 and 8.6 ± 3.7, respectively); both were higher (P < 0.001) than in controls (0.9 ± 0.3). The number of embryos did not differ significantly between the eCG and eCG+MPA groups (4.8 ± 2.8 and 3.5 ± 3.0, respectively), but both were higher (P < 0.001) than in the controls (0.7 ± 0.4). In conclusion, eCG, with or without MPA effectively induced a superovulatory response and multiple embryo production in llamas. © 2009 Elsevier Inc. All rights reserved.	es
dc.format	PDF	es
dc.identifier.citation	Theriogenology, Vol. 72, N°6, 803-808, 2009	es
dc.identifier.doi	10.1016/j.theriogenology.2009.05.019	es
dc.identifier.uri	https://repositoriodigital.uct.cl/handle/10925/639
dc.language.iso	en	es
dc.source	Theriogenology	es
dc.subject	Embriones	es
dc.subject	Llamas	es
dc.subject	Hiperestimulación ovárica	es
dc.title	Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence	es
dc.type	Artículo de Revista	es
uct.carrera	Agronomía	es
uct.carrera	Medicina Veterinaria	es
uct.catalogador	aga	es
uct.comunidad	Recursos Naturales	es
uct.facultad	Facultad de Recursos Naturales	es
uct.indizacion	ISI	es