PMID: 9532425Apr 9, 1998Paper

In ovo treatment with an aromatase inhibitor masculinizes postnatal hormone levels, abdominal fat pad content, and GH pulsatility in broiler chickens

Domestic Animal Endocrinology
E DewilE Decuypere

Abstract

Vorozole, a selective aromatase inhibitor, was administered in ovo to test the specific embryonic role of estrogen in conferring the sex distinction in GH release and body phenotype in broilers. On Day 6 of incubation, eggs were injected with saline or with different concentrations of vorozole. Postnatal blood samples were analyzed for T3, T4, GH, estradiol (E2), and testosterone (T). At the age of 4 wk, control and vorozole-treated birds were cannulated, and serial blood samples were withdrawn every 10 min for 5 hr, wherein GH pulsatility characteristics were determined using deconvolution analysis. The proportional abdominal fat pad weight was reduced significantly in the treated groups, especially in female birds. The vorozole treatment increased plasma T3, E2, T, and GH concentrations, and decreased T4. The frequency of the GH pulses was lower and the interval between the bursts (min) was higher in the vorozole-treated group, as were the mass secreted per burst (ng/ml), the amplitude (ng/ml/min) and the production rate (ng/ml/5 hr). In conclusion, early in ovo treatment with a potent aromatase inhibitor is able to increase the mean serum T3 and GH concentration and masculinize the GH pulse pattern, resulting in an economica...Continue Reading

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Citations

Mar 19, 2002·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Veerle BruggemanEddy Decuypere
Jun 13, 2003·Proceedings of the National Academy of Sciences of the United States of America·Manfred Gahr
Nov 25, 2003·Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine·A SechmanH Paczoska-Eliasiewicz
Jan 26, 2006·Endocrine Reviews·Johannes D VeldhuisCyril Y Bowers

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