Effect of vitamin D or calcium deficiency on duodenal, jejunal and ileal calcium-binding protein and on plasma calcium and 25-hydroxycholecalciferol levels in the growing pig

Abstract

Vitamin-D deficiency. -Two groups of Large-White pigs were used. In the first group, vitamin D-deficient pigs were produced as previously described (Pointillart, Garel and Guéguen, 1978). From weaning at 5 weeks of age, the piglets received a semi-synthetic vitamin D-deficient diet containing 0.9 p. 100 Ca and 0.6 p. 100 P. In the second group, control pigs were produced from sows receiving the standard pig diet

The effects of sow parity on digestibility of proximate components and minerals during lactation as influenced by diet and microbial phytase supplementation.

“…Plasma concentrations of 1,25-DHCC increased during lactation (Perrin, 1955;Harmon et al, 1974Harmon et al, , 1975Mahan and Fetter, 1982;Mahan, 1984;Miller et al, 1994), resulting in an increase of Ca and P absorption from the small intestine. The increased absorption of Ca from the small intestine is mediated through an increased intestinal production of calcium-binding protein (Thomasset et al, 1979), and increased P absorption seems to be a direct effect of 1,25-DHCC on the mucosal surface, which stimulates the entry of phosphate at the mucosal border (Jongbloed, 1987). The effects of 1,25-DHCC on bone resorption are less clear, although it has been shown to be involved, directly or indirectly, in bone mineral turnover.…”