9. Consequences of phosphorus deficiency and excess

Question 1

List the types of phosphorus deficiency

Answer 1

• Primary
• Secondary

Question 2

Causes of primary phosphorus deficiency

Answer 2

Lack of Phosphorus in feed

Question 3

Causes of secondary phosphorus deficiency

Answer 3

• Phytin overdose in monogastric animals

• Phytin: Ca²⁺ and Mg-salt of phytic acid which captures P*
• In ruminants degraded by phytase*

Question 4

List the consequences of phosphorus deficiency

Answer 4

• Hypophosphataemia (Ø Ru)
• Retarded growth
• Osteopathy
• Disorders of the reproductive functions
• Postpartum haemoglobinuria

Question 5

Retarded growth as a consequence of phosphorus deficiency

Answer 5

Caused by a decrease of organic phosphates: ATP, CrP

Question 6

Give the causes of phosphorus excess in the body

Answer 6

• Primary excess
• Secondary excess

Question 7

Primary excess of phosphorus as a cause of excess phosphorus

Answer 7

Caused by increased intake of phosphorus

Question 8

Secondary excess of phosphorus as a cause of excess phosphorus in the body

Answer 8

• ↓ Calcium in the body
• ↓ Renal function

Question 9

Give the consequences of excess phosphorus in the body

Answer 9

• Hyperphosphataemia
• Hypocalcaemia

These occur together, leading to → Osteopathy