Total Digestive Nutrients(TDN)

Vigyan Ashram, Pabal

What is TDNEvery fodder is having a capacity of how

much quantity of fodder is digested and how much quantity is waste

Explanation of TDNConsider a case below if we say Maize is having Total Digestive

Nutrients of 77percent meansIf 1 kg of maize is consumed as fodder , 770

grams is digested and 230 grams is waste

TDN

What is the use of finding TDNA question obviously comes in mind what is

the use of finding TDNBy finding TDN , a farmer can calculate exact

quantity of how much fodder to be given to cattle

This is useful in dairy and goat farming

Required quantities for calculating TDNQuantities Required for TDN calculation

How much percent TDN the fodder type has

How much is the weight of animal

How much TDN should be given per day to cattle

How much TDN fodder types haveFollowing is the table of fodder type and its

TDN ContentThey are already calculated and used as

standard Reference

TDN Chart

Weight of animal to be calculatedWeight of animal calculation is given in a

earlier PowerPoint presentation Video Link for finding cow weightPlease click here for a video in Marathi for

taking measurement of cattle weight

How much TDN required for CattleFrom the previous slides, we have came across

following thingsTDN Content in fodderWeight calculation of animal

Now since we know weight, here is one standard of how much TDN is to be given daily

The above calculation is a standard one

Total Amount of TDN to be given daily is 10 grams per kg of weight of cattle

Calculation of fodder requirements of cattle based on TDNConsider a case given belowCattle weight is 500 kgs.Fodder to be given is combination of jowar

stems(ज्वा�री� कडबा� ) ,green maize, groundnut cake(Total 3 fodder types)

Task to DoWe have to calculate daily fodder

requirements for one cattle

CalculationAs we have seen earlier

Weight of cow = 500 kgHence TDN Required = 500 x 10 = 5000 gms = 5 kg Now we have 3 fodder types as seen earlierTotal TDN to be given = TDN Required / fodder

typesTotal TDN = 5000 / 3 = 1667 grams for each fodderie 1667 grams of green maize,jowar stems and

groundnut cake each

Standard Amount of TDN to be given daily is 10 grams per kg of weight of cattle

Formula Fodder Weight = 100 x TDN to be given Standard Available TDN

Applying the formulaBy applying the formula, we will calculate how much

green maize we will require for fulfilling the TDN

Available TDN for green maize is 17%(Refer chart earlier)

Which means that for 1667 gms of TDN, we will require ??? kg of green maize

Applying the formula, we getFodder weight = 100 x 1667/17 = 9805 gramsThus we will require 9.805 kgs of green maize daily

for a cow of 500 kgs

Calculating other types of fodder requirementsWe have seen earlier for green maizeNow we will calculate for other remaining fodder

items

For Jowar stemsFodder weight = 100 x 1667 / 50(Refer the TDN chart)We require Jowar stems = 3334 grams = 3.334 kgs / day

For Groundnut cakeFodder weight = 100 x 1667 / 71(Refer TDN Chart)We require 2.347 kgs of Groundnut cake /day

Final calculationsThus we have seen that for a 500 kg weight

cow, To maintain the TDN we require fodder as shown below

Fodder Requirements per day for a 500 kg weight cow

9.805 grams of green maize(हि�रीवा� मक� चा�री�)

3.34 kgs of jowar stems(कडबा�)

2.347 kgs of groundnut cake(भु�ईम�ग पें�ड)

Total of 15.492 kgs / approx 15.5 kgs of fodder per day for 1 cow of 500 kgs

AssignmentReferring to earlier slideCalculate cost per kg for the fodder itemsMake total sum of cost of fodder items per

dayPrepare a monthly budget for a cow for

fodder