From October to December is the time when we produce the most milk.
On most farms, farmers milk their cows twice a day around 5am and 3pm. My cow-friends and I are really busy eating grass and making all that milk. The farmers are busy too, keeping milking equipment up to scratch and maintaining a clean farm dairy (after all, our farm dairy is a food factory and its milk may end up in some far flung corner of the world!).
This is also the time of year for mating cows so they calve next spring.
In summer the grass grows really fast, so the farmer turns it into silage or hay for us cows to eat later when there is less growing. Crops for us to eat (called forage crops), such as maize or turnips, are planted now for harvesting later.