PMID: 7543085Apr 1, 1995Paper

Serum hormones, follicular fluid steroids, insulin-like growth factors and their binding proteins, and ovarian IGF mRNA in sheep with different ovulation rates

Journal of Animal Science
L J SpicerR K Vernon

Abstract

Ovulation rate, serum hormone concentrations, follicular fluid (FFL) concentrations of steroids and IGF, IGF binding protein (IGFBP) activity in FFL, and follicular IGF-I and -II mRNA were compared during the follicular phase among five genotypes of ewes: Finn (F), Composite III (C), 1/2 Booroola Merino (B) x 1/2 F (B x F), 1/2 F x 1/2 C (F x C), 1/2 B x 1/2 C (B x C). Composite III ewes were a Columbia x Suffolk x Hampshire crossbred. Ovulation rates for F (n = 7), C (n = 5), B x F (n = 6), F x C (n = 3), and B x C (n = 8) ewes were 3.1, 1.6, 3.8, 2.9, and 2.9 (Pooled SEM = .5), respectively. Concentrations of IGF-I in FFL were 53% greater (P < .05) in large (> or = 4.1 mm) than in small (< 4.1 mm) follicles but did not differ (P > .10) among genotypes. In contrast, FFL IGF-II concentrations were greater (P < .05) in B x C and B x F ewes than in C or F x C ewes but did not differ between small and large follicles. Ligand blotting revealed that IGFBP activity of three species (34, 27 to 29, and 24 kDa) were lower (P < .05) in FFL of large than in FFL of small follicles but did not differ (P < .10) among genotypes. Follicular wall IGF-I mRNA and IGF-II mRNA was detected in 5 and 32% of the samples from preovulatory follicles, re...Continue Reading

Citations

Oct 4, 2011·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Monica Hayashi YashidaEduardo José Caldeira
Sep 28, 2001·Journal of Dairy Science·S M MacielL J Spicer
Feb 21, 2004·Journal of Animal Science·S E EchternkampL J Spicer
Feb 18, 2004·The Journal of Reproduction and Development·Sumie NonakaShigeo Hara
Mar 24, 2012·Animal : an International Journal of Animal Bioscience·A SchneiderM N Corrêa
May 20, 2020·Cell and Tissue Research·Zohreh MehdiniaMojtaba Rezazadeh Valojerdi
Mar 8, 2005·Reproduction : the Official Journal of the Society for the Study of Fertility·Kanako HayashiThomas E Spencer
Jul 1, 1995·Domestic Animal Endocrinology·L J Spicer, S E Echternkamp
Dec 2, 2008·Animal Reproduction Science·L K Doyle, F X Donadeu

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