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BOR - Papers in Press, published online ahead of print February 11, 2004.
Biol Reprod 2004, 10.1095/biolreprod.103.023143
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Submitted September 11, 2003
Returned for revision September 29, 2003
Accepted February 4, 2004

Pituitary


Episodic Gonadotropin Secretion in the Mature Fowl: Serial Blood Sampling from Unrestrained Male Broiler Breeders (Gallus domesticus)

Jorge A. Vizcarra , David L. Kreider , and John D. Kirby *

* To whom correspondence should be addressed. E-mail: jkirby{at}comp.uark.edu.

Abstract
Forty-week-old male broiler breeders were used in two experiments. Males were reared as recommended by the breeder, housed in individual cages, and cannulated to facilitate blood sampling. In experiment 1, blood samples were collected at 10-min intervals for 4 h commencing the day of cannulation (d 0), and for 12 h on each of d 1 and d 2. In experiment 2, blood samples were collected at 10-min intervals for 8 h on d 1. After centrifugation, plasma was stored at -20°C until LH, FSH (experiment 1 and 2), testosterone and corticosterone (experiment 1) concentrations were determined by RIA. Different statistical methods used to identify hormone secretion profiles revealed a characteristic pulsatile pattern of LH and FSH in plasma. However, LH pulses were more frequent and had greater amplitude than FSH pulses. Less than 32% of the FSH pulses were associated with LH episodes. Conversely, the association between LH and testosterone pulses average 83% in birds with testis weight greater than 10 g. Concentrations of corticosterone tended to increase after cannulation and remained elevated for only 3 to 4 h. Our data indicates that LH, FSH, and testosterone secretion is pulsatile in male broiler breeders. Additionally, LH pulses are associated with testosterone episodes but not with FSH pulses. The pulsatile pattern of FSH secretion, unique from those of LH, in adult males suggests that FSH secretion is independently regulated in the adult male fowl.

Key words: Testis • Anterior pituitary • Corticosterone • Follicle-stimulating hormone • Luteinizing hormone


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