Influence of 1α,25-dihydroxyvitamin D<sub>3</sub> on Calcium and Phosphorus Secretion of the Mammary Gland in Lactating Camels
2001
M. El Khasmi | F. Riad | A. Safwate | M. Farh | B. Faye | N. El Abbadi | K. Lalaoui | V. Coxam | M.J. Davicco | J.P. Barlet
Plasma calcium (Ca) and inorganic phosphorus (Pi) levels, and content of these minerals in milk were measured in six thirdparity she-camels after i.v. administration of 1α,25-dihydroxyvitamin D3 [1α,25-(OH)2D3]. This steroid significantly (P < 0.05) increased plasma Ca and Pi levels from 94.2 ± 4.1 and 54 ± 2.5 mg/l, before the first calcitriol injection at 0 h, to 108.1 ± 3,4 and 63.5 ± 2.4 mg/l 24 h after end of treatment, respectively. Ca and Pi levels remained high until the end of the test. Intravenous administration of 1α,25-(OH)2D3 significantly (P < 0.05) increased Ca and Pi concentration and secretion in milk. Ca concentration and secretion of milk sampled every 12 h increased from 1080 ± 30 mg/l and 1100 ± 64 mg/12 h at 0 h, to 1218 ± 34 mg/l and 1240 ± 57 mg/12 h after the second injection, respectively. Those of Pi increased from 732 ± 66 mg/l and 754 ± 61 mg/12 h at 0 h, to 840 ± 38 mg/l and 890 ± 56 mg/12 h after the second injection, respectively. Ca and Pi contents and secretion in milk remained high (P < 0.05) until 12 h after treatment. These results showed that 1α,25-(OH)2D3 might affect the mammary gland of lactating camels. It increased Ca and Pi contents in milk without, however, significantly affecting milk production.
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