Effects of dietary calcium, phytoestrogen rich diets and estrogen on intestinal calcium transport proteins, egg and eggshell quality in maturing layer hens / Ali Asghar Saki.
| Autor: | Saki, Ali Asghar |
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| Rok vydání: | 1998 |
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| Popis: | Corrigenda inserted behind title page. Copies of author's previously published articles inserted at end. Includes bibliographical references (leaves 193-210). xxii, 210 leaves : ill. (some col.) ; 30 cm. Title page, contents and abstract only. The complete thesis in print form is available from the University Library. Investigates whether estrogen modulates the proteins associated with calcium transport (eg calcium binding protein, calbindin D28k) in the intestinal tissue during sexual maturation of laying hens. Studies the temporal and spatial expression of estrogen receptors (ER) and calcium binding protein in jejunal tissue. Findings indicated the potential of estrogen to induce calbindin D28K in the intestinal tissue, from which it can be concluded that estrogen may increase calcium absorption and consequently calcium retention. Shows that the amount of estrogen normally present in the reproductive system is sufficient for the normal capacity of egg and eggshell production. Egg production and shell quality are significantly reduced by phytoestrogen. It is recommended that the concentration of phytoestrogen in poultry diets be investigated in more detail as it may act as an anti-nutritive factor and affect metabolism and productivity. Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Science, 1999 |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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