Corrigenda inserted behind title page. Copies of author's previously published articles inserted. Bibliography: leaves 193-210. This study investigated whether estrogen could modulate the proteins associated with calcium transport (eg calcium binding protein, calbindin D28k) in the intestinal tissue during sexual maturation of laying hens. The first study investigated 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. It was shown 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 were 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.
| Identifer | oai:union.ndltd.org:ADTP/82945 |
| Date | January 1998 |
| Creators | Saki, Ali Asghar. |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
| Relation | SUA, SUA:R, SUA:W |
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