Ratto Fuster, Marcelo; Gómez, C.; Berland Olea, Marco; Adams, G.P.

Effect of ovarian superstimulation on COC collection and maturation in alpacas

datacite.alternateIdentifier.citation	Animal Reproduction Science, Vol.97, N°3-4 246-256, 2007	es
datacite.alternateIdentifier.doi	10.1016/j.anireprosci.2006.02.002	es
datacite.creator	Ratto Fuster, Marcelo
datacite.creator	Gómez, C.
datacite.creator	Berland Olea, Marco
datacite.creator	Adams, G.P.
datacite.date	2007
datacite.date.issued	2012-02-26
datacite.subject	Alpacas	es
datacite.subject	Gonadotropinas	es
datacite.subject	Maduración in vitro	es
datacite.subject	Ovocitos	es
datacite.title	Effect of ovarian superstimulation on COC collection and maturation in alpacas	es
dc.date.accessioned	2012-02-26T04:48:41Z
dc.date.available	2012-02-26T04:48:41Z
dc.description.abstract	The objective of the present study was to compare the ovarian follicular response, cumulus-oocyte complex (COC) collection rate, and maturational status of COC collected from alpacas subsequent to treatment with two different superstimulatory protocols. Alpacas (n = 7 per group) were treated with: (1) 200 mg of FSH im divided bid for 3 d, plus a single i.v. dose of 1000 IU hCG 24 h after the last FSH treatment, or (2) 1200 IU of eCG as a single i.m. dose, plus a single i.v. dose of 1000 IU of hCG on day 3 after eCG treatment (day 0 = start of superstimulatory treatment). At 20-24 h post-hCG treatment, the ovaries were surgically exposed and COC were collected by needle aspiration of all follicles ≥6 mm. The FSH and eCG treatment groups did not differ with respect to the number of follicles ≥6 mm at the time of COC collection (20.0 ± 7.5 versus 27.0 ± 3.3; P = 0.5), the number of COC collected (26.2 ± 8.4 versus 23.3 ± 3.7; P = 0.7), or the collection rate per follicle aspirated (89% versus 87%; P = 0.7). No differences were detected between FSH- and eCG-treated alpacas in the number of expanded COC collected per alpaca (11.5 ± 2.9 versus 8.8 ± 2.8; P = 0.54), the number of expanded COC in metaphase II (8.5 ± 1.9 versus 6.0 ± 2.1; P = 0.1), or the number of compact COC with ≥3 layers of cumulus cells (12.5 ± 4.3 versus 14.3 ± 2.6; P = 0.72). A greater proportion (P < 0.05) of compact COC collected after FSH treatment matured in vitro to the metaphase II stage than after eCG treatment. Eight expanded alpaca COC were fertilized in vitro with llama sperm, three of which were fixed and stained 18 h after exposure to sperm and five were cultured in vitro. Two of the three stained oocytes were in the pronuclear stage, and all five of the cultured oocytes developed to the two-cell and morula stages at 2 and 7 days, respectively, after in vitro fertilization. In summary, FSH and eCG treatments were equally effective for ovarian superstimulation and oocyte collection. Cumulus-oocyte complexes were collected from more than 80% of follicles aspirated during laparotomy. Nearly one third of the COC collected after superstimulation were in metaphase II, and more than 70% of the remaining COC progressed to metaphase II after in vitro maturation for 26 h, bringing the mean number of oocytes available for in vitro fertilization to 16 per alpaca. Preliminary results support the hypothesis that alpaca oocytes obtained after superstimulation in the absence of progesterone are developmentally competent since morulae developed from all five COC fertilized and cultured in vitro.	es
dc.format	PDF	es
dc.identifier.uri	https://repositoriodigital.uct.cl/handle/10925/768
dc.language.iso	en	es
dc.source	Animal Reproduction Science	es
oaire.resourceType	Artículo de Revista	es
uct.carrera	Medicina Veterinaria	es
uct.catalogador	FGE	es
uct.comunidad	Recursos Naturales	es
uct.facultad	Facultad de Recursos Naturales	es
uct.indizacion	ISI	es