31:44 I have always thought to myself to create a feed for a cow with 1/4 Silage, 1/4 boiled grains, 1/4 hay from grass or tree hay, 1/4 (Rice/grain husk + an oil seed like sesame or mustard in equal proportion) . In India they raise dairy cows in feed lots, and they feed this as diet for dairy buffaloes and cows. Interesting video thank you.
