Effects of level of food intake on ovarian follicle number, size and steroidogenic capacity in the ewe

The effect of high (H) or low (L) levels of food intake, during the preceding 4 weeks, on ovarian follicle numbers and steroidogenic capacity were investigated in groups of 12 adult Scottish Blackface ewes. Ewes of the two treatments had similar levels of body condition at the time of study but ther...

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Bibliographic Details
Published in:Animal reproduction science 1998-08, Vol.52 (2), p.131-138
Main Authors: Rhind, S.M, McNeilly, A.S
Format: Article
Language:English
Subjects:
Animals
Body Composition
BREBIS
Eating
Estradiol - analysis
Estradiol - biosynthesis
ESTROGENOS
EWES
FEED INTAKE
Feeding and nutrition
Female
FOLICULOS OVARICOS
Follicle
FOLLICULE OVARIEN
HORMONAS ESTEROIDES
HORMONE STEROIDIQUE
INGESTION DE PIENSOS
OESTROGENE
OESTROGENS
Ovarian Follicle - anatomy & histology
OVARIAN FOLLICLES
Ovariectomy
Ovary - metabolism
OVEJA
Ovulation
PRISE ALIMENTAIRE (ANIMAUX)
Sheep - physiology
Sheep ovary
STEROID HORMONES
Steroids
Steroids - biosynthesis
TESTOSTERONAS
TESTOSTERONE
Testosterone - analysis
Testosterone - biosynthesis
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Summary:The effect of high (H) or low (L) levels of food intake, during the preceding 4 weeks, on ovarian follicle numbers and steroidogenic capacity were investigated in groups of 12 adult Scottish Blackface ewes. Ewes of the two treatments had similar levels of body condition at the time of study but there was a twofold difference in levels of food intake. Ovaries were surgically removed on day 11 or 12 of the oestrous cycle (luteal phase; n=6 per nutritional treatment) or at 30 h after injection (i.m.) of prostaglandin F 2α analogue on day 11 or 12 of the cycle (follicular phase; n=6 per nutritional treatment). Ovarian follicles >1 mm diameter were dissected out and incubated individually for 2 h at 37°C, in 1 ml of medium 199 which was then assayed to determine concentrations of oestradiol and testosterone. There were significantly more small follicles (1–2.5 mm diameter) in (H) than (L) ewes ( P2.5 mm diameter) during either phase of the cycle and no difference in the mean diameters (mm) of the two largest follicles in each animal. However, although there were higher rates of synthesis of both oestrogen ( P
ISSN:0378-4320
1873-2232
DOI:10.1016/S0378-4320(98)00097-9