Table 3. Analysis of variance of the melatonin concentration in milk
from milking animals (randomized block design)
Source of variation Degrees of freedom Square average Pr > F
Cows 9 10.7146 0.5617
Day 9 17.7306 0.1885
Time (in hours) 1 64029.0269 < 0.0001
Cows × day 81 15.9031 0.1270
Cows × time (in hours) 9 8.9629 0.6882
Pr, probability level.