AGRON 550: Forage Quality

Question Total nitrogen (N) is 100% true protein

False

Question What does RFV stand for?

Relative Feed Value

Question What molecule adds rigidity but is indigestible to livestock?

Lignin

Question What does BMR stand for and why is it important in sorghum?

Brown Mid Rib. indicates lower lignin concentration

Question How do you calculate crude protein?

Total nitrogen (%) multiplied by 6.25

Question Full bloom alfalfa has an RFV of what value?

100

Question What happens when ADF and NDF increase?

Intake, energy, nutrients, and feeding value decrease

Question Why are plants grown at lower temperatures more digestible?

Lower lignin concentration

Question What is an example of non-protein nitrogen?

Urea

Question RFQ requires what measurement instead of DDM?

Total Digestible Nutrients (TDN)

Question ADF consists of which two components?

Cellulose Lignin

Question Which has higher protein

grasses or legumes?: Legumes

Question Cellulose, hemicellulose, and lignin are what type of carbohydrate?

Structural carbohydrates

Question Nutritive value is determined by which three components?

Carbohydrates, Proteins, Lipids

Question The In Vitro (IVDMD) and In Situ Bag methods measure what?

Digestibility

Question Dry matter intake (DMI) is determined using which fiber measurement?

Neutral Detergent Fiber (NDF)

Question NDF consists of which three components?

Hemicellulose, Cellulose, Lignin

Question Digestible dry matter (DDM) is determined using which fiber measurement?

Acid Detergent Fiber (ADF)

Question Where is bypass protein digested and absorbed?

Small intestine

Question Proteins not digested in the rumen are called what?

Rumen bypass proteins

Question RFV has traditionally been used for which forage species?

Alfalfa

Question What are the two major types of carbohydrates?

Structural and non-structural carbohydrates

Question What is the equation for percent moisture content?

100 minus percent dry matter (DM)

Question RFQ is better for grasses and legume-grass mixtures.

True

Question What two measurements are used to calculate RFV?

Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF)

Question List four factors affecting forage quality.

Stage of maturity, Temperature, Moisture, Soil fertility, Pests, Species, Plant parts