Effect of restricted nutrition on timing of puberty in female Soay sheep

Journal of Reproduction and Fertility
C L AdamP Young

Abstract

Ovariectomized, oestradiol-implanted Soay ewe lambs from 21 September (aged 21 weeks) had restricted (liveweight maintenance) (n = 4) or unrestricted food (n = 4); ovary-intact lambs had unrestricted food (n = 8). LH activation in ovariectomized lambs on restricted and unrestricted food and onset of ovulatory cycles in ovary-intact lambs all occurred on 7 December (SED 8.8 days) (32 weeks), but at different liveweights (24.2, 17.9 and 18.3 kg, respectively, SED 1.22). LH pulse frequency was similar in ovariectomized lambs on restricted and unrestricted food. From 29 August (aged 18 weeks), Soay ewe lambs in seasonally advanced decreased artificial daylength were given restricted food, unrestricted food, or food was restricted for 8 weeks and then unrestricted (n = 8 per group). Ovarian cycles started 3 weeks earlier than in lambs in natural photoperiod on similar dates for all three groups (14, 18 and 19 November, respectively, SED 5.5 days) (29 weeks), but at different liveweights (16.2, 20.7, and 18.4 kg, respectively, SED 0.87). From 1 August, Suffolk x Greyface ewe lambs (aged 16 weeks) had restricted food, unrestricted food, or food restricted for 8 weeks and then unrestricted (n = 8 per group). By 1 November (29 weeks), 0...Continue Reading

Citations

Oct 13, 2005·New Zealand Veterinary Journal·C G Brown-DouglasP F Fennessy
Feb 14, 2012·Animal Reproduction Science·I ValasiG S Amiridis
Jun 10, 2008·Best Practice & Research. Clinical Endocrinology & Metabolism·Maria Isabel Hernández, Verónica Mericq
Jul 31, 2009·Reproduction in Domestic Animals = Zuchthygiene·B KotsampasiG Zervas
Jul 1, 2007·Animal : an International Journal of Animal Bioscience·J A DelgadilloE Carrillo
Jun 11, 2008·Journal of Pediatric Endocrinology & Metabolism : JPEM·Maria Isabel Hernández, Verónica Mericq

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