ANSC 3307 Final Review

Which one of the following statements is correct?

For proper silage making, DM content of forage must be between 25-35%.

When forages such as field corn are ensiled, which of the following groups of microorganisms would one desire to proliferate inside the silo, and thereby decrease the pH of the ensiled material?

Lactic-acid producing bacteria.

The optimal cutting point for hay occurs when one can achieve maximum yield of which of the following options?

Digestible dry matter.

When corn crop is ensiled, which of the following groups of microorganisms would you wish to proliferate inside the silo, and thereby decrease the pH of the ensiled material?

Lactic-acid producing bacteria

Animal requirements for minerals and vitamins are usually established by the following method:

dose-response study

The ground calcitic limestone is the most common source of which of the following nutrient in livestock diets?

Calcium, which represents approximately 36% of such source.

Cation-anion balance is often used in dairy nutrition to balance diets for transition cows. Which of the following formulas is used to calculate cation-anion balance of a diet (values for each element would be in milliequivalents)?

(Na + K) - (Cl + S)

Tyrosinase is an enzyme that contains a very important mineral in its composition. Such enzyme is involved in the pigmentation (melanin) of skin and hair. The deficiency of such mineral will result in loss of hair pigmentation among other issues. Which mineral is this?

Copper.

Blood clotting is the primary physiological function of which of the following vitamins?

Vitamin K

Which of the following statements would likely be true regarding vitamins A and E?

Both vitamins A and E are subject to destruction by oxidation

Requirement of Vit. B12 is closely related to which of the following mineral (s) in ruminant diets?

cobalt

Sodium bicarbonate is a buffer that is frequently used in dairy cattle diets to increase the acetate:propionate ratio and to do which of the following?

control ruminal pH, increase cation-anion balance, maintain milk fat,

It is an enzyme that can be added to monogastrics diets aiming to increase phosphorus availability as well as decrease phosphorus excretion in feces.

phytase

In the U.S., the ..............................................................
must approve feed additives before they can be used in livestock feeds

FDA