Solids not fat(SNF) can be estimated with a formula.
Herez the formula -----Intially the Total solids(TS) need to be calculated.
TS = (L-1) * 1000/4 + (1.22* fat%) +0.72
L= corrected lactometer reading.
Lactometer is the instrument used to measure the specific density of milk.
Fat percent can be estimated by Gerber test for fat.
This test is used to determine the fat content of the milk. 10.94 ml. of milk at 20 degrees Celsius is added to a butyrometer together with sulphuric acid and amyl alcohol. After centrifugation, the sample is put in a 65 degrees Celsius water bath and read after 3 minutes. The fat content from this reading should not be less than 3%.
I want to know more about the ).72 factor, how does it come, and how does it varyy from place to place. Here in UP, I see this factor as 0.5 and ).14.....so many time there is confusion and unnecessary discussions while selling the milk.
can you or someone else clarify it.