ANSC 2120 Lecture Notes - Lecture 21: Phytase, Cholecalciferol, Ergocalciferol

• School: Cornell University
• Department: Animal Science
• Course: ANSC 2120
• Professor: Debbie Cherney

Document Summary

Lecture 21: i calcium, phosphorus, and vitamin d & ii magnesium (cid:1) For general information on biological roles, deficiency symptoms, and dietary sources, see relevant sections in minerals and vitamins supplementary notes (cid:1) (cid:1) Both ca and p are required for normal bone functions, as well as many non-skeletal functions. Dietary deficiency of ca or p or their regulatory hormone (vitamin d) causes: rickets in growing animals, osteomalacia in adult animals, milk fever (parturient paresis) in lactating animals (cid:1) (cid:1) (cid:1) (for details see lecture 39) Ca or p status is determines by ca or p balance: balance = dietary intake outputs (milk, feces, urine) Bioavailability of calcium and phosphorus in feed sources. Factors influencing intestinal absorption of ca and p. Ca:p ratio large excess of either car o p interferes wit h absorption of the other. Large intakes of fe, al, and mg interfere with p absorption forming insoluble phosphates.