Page 32 - MWC 9-14-2023s

UNLOCKING The Midwest Cattleman · September 14, 2023 · P32
continued from page 31
the plant. It is composed of need to include 30.65 lb. of falfa hay and is commonly
hemicellulose, cellulose, and hay to meet the energy goal used as a quality measure-
plied in that ton of forage. lignin. NDF is a predictor of (16 lb. ÷ 58% TDN ÷ 90% DM ment when buying or selling
To determine pounds of pro- voluntary intake as it pro- = 30.65 lb.). those forages. RFQ combines
tein in a ton of forage, mul- vides bulk or gut fill. In gen- Net energy (NE): Net en- predicted intake (NDF) and
tiply 2,000 lb. by the DM eral, low NDF values are de- ergy for gain (NEg) is an es- digestibility (ADF) but uses
percentage and then multi- sired, because NDF increases timate of the energy value of different formulas for grass-
ply that number by the CP as forages mature. a feed used for body weight es and legumes. Neither is
percentage. For example, if Macro minerals: Macro gain above that required for used in diet formulation,
a forage with 90% DM costs minerals are those utilized maintenance. Net energy for but both can prove valuable
$100/ton as received, with as a percentage of the diet. maintenance (NEm) is an when quickly comparing for-
a crude protein level of 10% These minerals needed, in estimate of the energy value ages.
on a DM basis, the price per larger quantities, are calcium of a feed to maintain animal Don’t let all these num-
pound of CP would be $0.556 (Ca), phosphorus (P), potassi- tissue without gain or loss of bers confuse you. Data from
($100/[2,000 lb.*90%*10%] = um (K), magnesium (Mg) and weight. Net energy for lac- your forage samples can help
$0.556). sulfur (S). tation (NEl) is an estimate you make more educated de-
Acid detergent fiber (ADF): Trace minerals: Trace of the energy value of a feed cisions. Decisions that affect
ADF is the portion of fiber minerals are those utilized in used for milk production and your bottom line. With the
that consists of cellulose and small amounts and reported body maintenance. When for- right tools and a little un-
lignin. These are the least in parts per million. Some of mulating rations, the NE val- derstanding of your forage
digestible components of the these are copper (Cu), man- ues are useful in determining analysis, you can increase
plant. ADF relates to over- ganese (Mn), cobalt (Co), zinc the optimal energy to accom- your forage purchasing savvy
all forage digestibility and is (Zn), iodine (Io) and selenium plish producer objectives. while providing more precise,
used to calculate total digest- (Se). Many times, questions balanced nutrition to your
ible nutrients and net energy. Total digestible nutrients surround relative feed value beef herd.
A high ADF value indicates a (TDN): TDN is the estimated (RFV) and relative forage
lower energy value. percentage of digestible car- quality (RFQ). RFV is the
Neutral detergent fiber bohydrates, protein, and fat. prediction of feeding value
(NDF): The NDF is the fiber If a producer wanted to sup- that combines both estimated
fraction containing the plant ply 16 lb. of TDN, then a for- intake (NDF) and digestibili-
cell wall components that age with 58% TDN and 10% ty (ADF) into a single index.
are part of the structure of moisture (90% DM) would RFV is used to evaluate al-

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