# Shared Flashcard Set

## Details

Forage Management & Utilization Math
Forage Management & Utilization Math
35
Agriculture
02/07/2017

Term
 Critical LAI =
Definition
 LAI required to intercept 95% of incident light
Term
 how to calculate % dry matter (% DM)
Definition
 Percent DM = 100% - moisture %
Term
 how to calculate Estimated Digestible Dry Matter (DDM)
Definition
 Estimated Digestible Dry Matter = 88.9 – [0.779 x ADF(%)]
Term
 how to calculate Estimated Dry Matter Intake (DMI)
Definition
 Estimated Dry Matter Intake = 120 / NDF (%)
Term
 how to calculate NFE
Definition
 NFE = 100 –(CP + EE + CF + Ash + Moisture)When crude protein, fat, water, ash, and fiber are added and the sum is subtracted from 100, the difference is NFE.
Term
 how to calculate dietary cation-anion difference (DCAD)
Definition
 DCAD, meq/100 grams of DM = [(%Na/.023) + (%K/.039)] – [(%Cl/.0355) + (%S/.016)]
Term
 how to calculate digestible dry matter (DDM)
Definition
 DDM% = 88.9 – (ADF% x 0.779)
Term
 how to calculate digestion coeffecient of a nutrient
Definition
 Digestion coefficient of a nutrient = 100 - (100 * ((% Indicator in feed * % Nutrient in feces) / (% Indicator in feces * % Nutrient in feed)))
Term
 how to calculate digestion coeffecient of dry matter
Definition
 Digestion coefficient of dry matter = 100 - (100 * (% Indicator in feed DM / % Indicator in fecal DM))
Term
 how to calculate dry matter digestibility
Definition
 (kg dry matter intake - kg fecal dry matter)/(kg dry matter intake)
Term
 how to calculate dry matter intake (DMI)
Definition
 DMI (% of body weight) = 120/NDF%
Term
 how to calculate feed value
Definition
 Feed value = nutritive value * physical aspects of the forage
Term
 how to calculate nitrogen balance
Definition
 (N in the food consumed) - (N in feces) - (N in urine)(nitrogen retention.)
Term
 how to calculate nonfiber carbohydrates (NFC)
Definition
 NFC% = 100% - [%NDF + %CP + %fat + %ash]
Term
 how to calculate nutrient digestibility
Definition
 nutrient digestibility (%) = ((nutrient intake - nutrient in feces) / (nutrient intake)) * 100
Term
 how to calculate protein equivalent
Definition
 protein equivalent (%) = 6.25 * % protein
Term
 how to calculate relative feed value (RFV)
Definition
 RFV% = DDM (%) x DMI (% of body weight)/ 1.29Relative Feed Value (RFV) = (DDM x DMI) / 1.29
Term
 how to calculate the digestibility of a nutrient in the test feed stuff being fed in form of mixed feed
Definition
 Digestibility of nutrient in test feed (%) = ((A)- (B) (C) X 100)/(D)A = Digestibility of nutrient in total dietB = Digestibility of nutrient in basal diet (usually already determined when fed aloneC = proportion of total nutrient in diet supplied by basal dietD = proportion of total nutrient in diet supplied by test feed.
Term
 how to calculate yield of a grass forage
Definition
 Tiller Density x Weight = Yield
Term
 how to estimate Net energy of lactation (Mcal/lb) (NEL)
Definition
 NEL = 1.50 - (ADF% x 0.0267)
Term
 leaf area index (LAI) =
Definition
 ratio of leaf area to land area
Term
 how to calculate growing degree days (GDD)
Definition
 GDD = ((Tempmax + Tempmin)/ 2) - 32
Term
 IVDMD
Definition
 In vitro dry matter digestibility
Term
 NDF basically measures...
Definition
 total cell wall content in the plant
Term
 NUE =
Definition
 N uptake/N applied
Term
 how to calculate Nutrients Needed in Supplement
Definition
 Animal Nutrient Requirements - Nutrients Supplied by Forage = Nutrients Needed in Supplement
Term
 how to calculate forage cost
Definition
 forage cost = (total cost / forage yield)
Term
 1 animal unit
Definition
 1,000 lbs b.w.
Term
 stocking rate
Definition
 animal units per acre over all acres and a period of time
Term
 ideal stocking rate
Definition
 1 AU/2 acres
Term
 stocking density
Definition
 animals per acre at any one point in time
Term
 ideal stocking density
Definition
 15 AU/1 acre
Term
 how to calculate available acres
Definition