Vitamins Quiz

Why does adding phytase to swine and poultry diets allow a reduction in total dietary phosphorus

Phytase breaks done phytate-bound phosphorus in plant ingredients, increasing P bioavailability and reducing the need for inorganic P supplementation

all vitamins are water-soluble, readily excreted in urine, and therefore toxicity never occurs. T or F

False

• some B vits can cause toxicity when consumes in excessive amounts, despite being water-soluble

Which characteristics are common to fat-soluble vitamins

• contain isoprene solvents

• are relatively insoluble in polar solvents

energy used for the Na/K -ATPase pump is included in maintenance and energy. T or F

True

what concentration gradients are maintained by the Na/K -ATPase pump

• High Na⁺ outside the cell
• High K⁺ inside the cell
• Requires ATP → contributes to maintenance energy requirements

Which statement about the parathyroid hormone is correct

PTH requires active vitamin D (calcitriol) to fully exert its effects on Ca metabolism

what is the main role of parathyroid hormone

• Increases blood Ca
• Stimulates bone resorption
• Increases renal Ca reabsorption
• Activates vitamin D → increases intestinal Ca absorption

limestone is a good Ca source but is very expensive and rarely used in livestock

False

• limestone is inexpensive, widely available, and commonly used as a calcium supplement in livestock diets