אסיף מאגר המחקר החקלאי

Regulation of calcium absorption by fowl intestine

Year:

1973

Source of publication :

Authors :

Volume :

225

Co-Authors:

Hurwitz, S., Inst. Anim. Sci., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Bar, A., Inst. Anim. Sci., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Cohen, I., Inst. Anim. Sci., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel

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Abstract:

Yttrium 91 was used as a reference substance to measure regulatory changes in calcium absorption in laying hens. 45Ca and 32P transfer from ligated loops in situ was used to estimate the respective mineral absorption capacity in chicks. Duodenal calcium absorption increased at the onset of egg production; a maximal value was obtained in hens after calcium restriction. The duodenal 45Ca transfer in chicks increased by mineral restriction and was inversely related to tibia ash. The response of the jejunum to the dietary treatment was much smaller. 32P transfer could not be related to tibia ash although it somewhat increased by mineral restriction. Changes in duodenal calcium absorption were correlated with mucosal calcium binding activity. In hens, calcium absorption was higher along the small intestine during shell formation than when no shell was formed, except for the lower ileum. The results suggest, for the fowl, the action of one regulatory mechanism in the duodenum that responds to relatively longterm changes in the calcium demands and another, apparent along most of the small intestine, which responds to short term changes in the calcium demands.

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