Not a bug, "just a feature".
When a caravan is traveling in a grassy environment, a cow would be eating grass and producing milk, increasing the food available.
Would give the player some reason to bring non-pack animals along on the journey.
If a cow uses one day to produce 8 milk, the player should be noted that for every day, the cow will produce nutrition equal to 1/4 of a meal. (or something along these lines)
When a caravan is traveling in a grassy environment, a cow would be eating grass and producing milk, increasing the food available.
Would give the player some reason to bring non-pack animals along on the journey.
If a cow uses one day to produce 8 milk, the player should be noted that for every day, the cow will produce nutrition equal to 1/4 of a meal. (or something along these lines)