in animal farm by george orwell chapter 9,What were "superannuated" animals? What was suggested for them?

A "superannuated" animal was an aging animal.... an old animal. It was suggested that these animals would be provided with a pasture fenced off especially for their use, and that they would be allowed a specified amount of food per day.

Now that the small field beyond the orchard had been set aside for barley, it was rumoured that a corner of the large pasture was to be fenced off and turned into a grazing-ground for superannuated animals. For a horse, it was said, the pension would be five pounds of corn a day and, in winter, fifteen pounds of hay, with a carrot or possibly an apple on public holidays.