1. 1. TocherAnalyst1927 , page470 .
2. Normal day to day variability of yield of milk and fat of individual cows
3. 3. variations in thecomposition ofmilk. misc. pub. no. 65 1929, min. of agric.
4. 4. cranfieldFarmer and stockbreeder, 1929 .
5. 5. bibby'sbook onmilk, section 1, page7 .