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Journal of Animal Science, Vol 69, Issue 3 1140-1146, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Insulin-like growth factor I in follicular development and function in postpartum beef cows

L. M. Rutter and J. G. Manns
Alberta Agriculture, Edmonton, Canada.

The objective of this study was to determine whether nutrition affects follicular growth and(or) steroid and insulin-like growth factor I (IGF-I) concentrations in follicular fluid. Beginning 6 d after calving, Hereford-cross cows (n = 28) were fed either 14 (ad libitum) or 7 (restricted) kg.animal1.d-1 of chopped alfalfa-brome hay. Half the cows in each treatment were ovariectomized on d 20 (OVX-20) and the remaining half on d 35 (OVX-35) postpartum. Cow weight and condition score were recorded weekly, and blood was collected thrice weekly for determination of insulin, IGF-I, glucose, and free fatty acid (FFA) concentrations. At ovariectomy, follicular fluid from each follicle greater than or equal to 4 mm in diameter was aspirated for determination of IGF-I, progesterone (P4), and estradiol-17 beta (E2) concentrations. Restricted cows lost more weight after calving than did ad libitum cows (P less than .0001), although all cows lost similar amounts of body condition (time postpartum, P = .008). Concentrations of FFA were elevated (P less than .0001) in restricted cows from wk 2 through 5 after calving but did not change with time in ad libitum cows. Plasma concentrations of glucose were lower in restricted than in ad libitum cows (59.6 +/- .4 vs 61.8 +/- .4 mg/dl; P = .05), but insulin and IGF-I were similar (P greater than .10) between dietary treatments.(ABSTRACT TRUNCATED AT 250 WORDS)


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R. P. Wettemann, C. A. Lents, N. H. Ciccioli, F. J. White, and I. Rubio
Nutritional- and suckling-mediated anovulation in beef cows
J Anim Sci, February 1, 2003; 81(14_suppl_2): E48 - 59.
[Abstract] [Full Text] [PDF]


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Copyright © 1991 by the American Society of Animal Science.