Concept:Steaming up is the extra feeding given to pregnant animals during the final stage of pregnancy.
Explanation:This ration is provided to animals such as cows or ewes in the last few weeks before giving birth.
It supplies extra nutrients to support the unborn calf and improve the mother's body condition.
It also prepares the udder for future milk production after calving.
Lactating animals are already producing milk, so this diet is not specially meant for them.
Weaned young animals and breeding female animals are not the target group for steaming up.
Therefore, steaming up ration is best suited for pregnant animals.
Answer:A. pregnant animals