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Regular Article |
c Division of Integrative Biology, Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, United Kingdom
d Department of Applied Physiology, Scottish Agricultural College, Craibstone Estate, Bucksburn, Aberdeen AB21 9YA, United Kingdom
e University of Nottingham, Division of Agriculture and Horticulture, School of Biosciences, Loughborough, Leicestershire LE12 5RD, United Kingdom
ABSTRACT
Heifers were assigned either low or high (HE) levels of energy intake and low or high concentrations of dietary crude protein. The effect of these diets on the plasma concentrations of insulin, insulin-like growth factor (IGF)-I, and urea on follicular growth and early embryo development is described. We propose that the observed dietary-induced changes in the ovarian IGF system increase bioavailability of intrafollicular IGF, thus increasing the sensitivity of follicles to FSH. These changes, in combination with increased peripheral concentrations of insulin and IGF-I in heifers offered the HE diet, contribute to the observed increase in growth rate of the dominant follicle. In contrast to follicular growth, increased nutrient supply decreased oocyte quality, due in part to increased plasma urea concentrations. Clearly a number of mechanisms are involved in mediating the effects of dietary energy and protein on ovarian function, and the formulation of diets designed to optimize cattle fertility must consider the divergent effects of nutrient supply on follicular growth and oocyte quality.
First decision: 25 August 2000.
1 Ministry of Agriculture Fisheries and Food (contract DSO206) and Biotechnology and Biological Sciences Research Council supported this study. Scottish Agricultural Colleges receives funding from the Scottish Executive Rural Affairs Department. The Medical Research Council funded K.J.W.
2 Correspondence: FAX: 0131 440 0434; david.armstrong{at}bbsrc.ac.uk
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