nipple vs bucket feeding
Animal Health Ireland maintains that feeding calves from a nipple drinker is more natural than bucket feeding.
Feeding calves from a nipple is more natural, takes longer and helps the calves satisfy their urge to suckle.
From a behavioural point of view, nipple drinkers are preferable to buckets. However, most calves can be fed successfully from a bucket, once trained.
The feeding method does not have a major impact on weight gain.