This slideshow explains about what is TDN Total Digestive Nutrients for fodder management of dairy animals

1. Vigyan Ashram, Pabal

2. What is TDN
 Every fodder is having a capacity of how much
quantity of fodder is digested and how much quantity
is waste
 Explanation of TDN
Consider a case below
if we say Maize is having Total Digestive Nutrients of
77percent means
If 1 kg of maize is consumed as fodder , 770 grams is
digested and 230 grams is waste

3. TDN

4. What is the use of finding TDN
 A question obviously comes in mind what is the use of
finding TDN
 By 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

5. Required quantities for calculating
TDN
Quantities 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

6. How much TDN fodder types have
 Following is the table of fodder type and its TDN
Content
 They are already calculated and used as standard
Reference

7. TDN Chart

8. Weight of animal to be calculated
 Weight of animal calculation is given in a earlier
PowerPoint presentation
 Video Link for finding cow weight
 Please click here for a video in Marathi for taking
measurement of cattle weight


9. How much TDN required for Cattle
 From the previous slides, we have came across
following things
 TDN Content in fodder
 Weight 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

10. Calculation of fodder requirements
of cattle based on TDN
 Consider a case given below
 Cattle weight is 500 kgs.
 Fodder to be given is combination of jowar
stems( ) ,green maize, groundnut
cake(Total 3 fodder types)
Task to Do
 We have to calculate daily fodder requirements for one
cattle

11. Calculation
 As we have seen earlier
 Weight of cow = 500 kg
 Hence TDN Required = 500 x 10 = 5000 gms = 5 kg
 Now we have 3 fodder types as seen earlier
 Total TDN to be given = TDN Required / fodder types
 Total TDN = 5000 / 3 = 1667 grams for each fodder
 ie 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

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

13. Applying the formula
 By 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 get
 Fodder weight = 100 x 1667/17 = 9805 grams
 Thus we will require 9.805 kgs of green maize daily for a
cow of 500 kgs

14. Calculating other types of fodder
requirements
 We have seen earlier for green maize
 Now we will calculate for other remaining fodder items
For Jowar stems
 Fodder weight = 100 x 1667 / 50(Refer the TDN chart)
We require Jowar stems = 3334 grams = 3.334 kgs / day
For Groundnut cake
 Fodder weight = 100 x 1667 / 71(Refer TDN Chart)
 We require 2.347 kgs of Groundnut cake /day

15. Final calculations
 Thus 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
3.34 kgs of jowar stems
2.347 kgs of groundnut cake
Total of 15.492 kgs / approx 15.5 kgs of fodder per day
for 1 cow of 500 kgs

16. Assignment
 Referring to earlier slide
 Calculate cost per kg for the fodder items
 Make total sum of cost of fodder items per day
 Prepare a monthly budget for a cow for fodder