Physiological and morphological maturation of the chicken pituitary.

Persistent Link:
http://hdl.handle.net/10150/185321
Title:
Physiological and morphological maturation of the chicken pituitary.
Author:
Rahman, Zia-ur-.
Issue Date:
1990
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The present study reports the effects of MMI-treatment and castration on the maturation of the pituitary of White Leghorn cockerels. Body weights increase with age, but are significantly lower in the MMI-treated birds. Increases in total serum proteins and albumin in MMI-treated birds results in a much higher albumin/globulin ratio than that found in other birds. Castrated birds have the heaviest and MMI-treated birds have the smallest pituitaries. The increase in pituitary size appears to be due to cellular hypertrophy since the amount of DNA/gland is the same in castrated and control birds and is less in MMI-treated birds. Serum GH, TSH, T₃, and T₄ decreased with age in all groups, but were lowest in MMI-treated cockerels. Serum LH levels were highest in castrated birds and lowest in MMI-treated birds and serum prolactin highest in MMI-treated birds. Thyrotrophs, corticotrophs and lactotrophs were restricted to the cephalic lobe and somatotrophs occurred only in the caudal lobe. Luteotrophs occurred in both cephalic and caudal lobes of the pituitary. An increase in TSH, GH, PRL, ACTH, and LH cells occurred during maturation in both control and castrated birds but PRL, TSH and LH producing cells decreased in MMI-treated birds. Somatotrophs decreased in size with age as did their granules. Castrated birds had gonadotrophs that were significantly larger than those of normal or MMI-treated birds. This increase in gonadotroph size made a significant contribution to the postnatal increase in the size of the pituitary gland.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Agriculture
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Physiological Sciences; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Chiasson, Robert B.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titlePhysiological and morphological maturation of the chicken pituitary.en_US
dc.creatorRahman, Zia-ur-.en_US
dc.contributor.authorRahman, Zia-ur-.en_US
dc.date.issued1990en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe present study reports the effects of MMI-treatment and castration on the maturation of the pituitary of White Leghorn cockerels. Body weights increase with age, but are significantly lower in the MMI-treated birds. Increases in total serum proteins and albumin in MMI-treated birds results in a much higher albumin/globulin ratio than that found in other birds. Castrated birds have the heaviest and MMI-treated birds have the smallest pituitaries. The increase in pituitary size appears to be due to cellular hypertrophy since the amount of DNA/gland is the same in castrated and control birds and is less in MMI-treated birds. Serum GH, TSH, T₃, and T₄ decreased with age in all groups, but were lowest in MMI-treated cockerels. Serum LH levels were highest in castrated birds and lowest in MMI-treated birds and serum prolactin highest in MMI-treated birds. Thyrotrophs, corticotrophs and lactotrophs were restricted to the cephalic lobe and somatotrophs occurred only in the caudal lobe. Luteotrophs occurred in both cephalic and caudal lobes of the pituitary. An increase in TSH, GH, PRL, ACTH, and LH cells occurred during maturation in both control and castrated birds but PRL, TSH and LH producing cells decreased in MMI-treated birds. Somatotrophs decreased in size with age as did their granules. Castrated birds had gonadotrophs that were significantly larger than those of normal or MMI-treated birds. This increase in gonadotroph size made a significant contribution to the postnatal increase in the size of the pituitary gland.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectAgricultureen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplinePhysiological Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorChiasson, Robert B.en_US
dc.contributor.committeememberHadley, Mac E.en_US
dc.contributor.committeememberHilwig, Ronald W.en_US
dc.contributor.committeememberRay, Donald E.en_US
dc.contributor.committeememberWegner, Thomas N.en_US
dc.identifier.proquest9114069en_US
dc.identifier.oclc706495774en_US
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