When the calf drinks milk from a bucket the oesophageal groove stays open and milk flows into the rumen as well as the abomasum. We know that the rumen is not equipped to deal with milk and the milk ferments causing gut ache and acidosis.
Bucket feeding calves is an old-fashioned system, common in some parts of the world and unheard of in others.
Buckets are cheap to buy or are often given away and so can be an attractive option to those wanting to reduce equipment costs
Absolutely no saliva is produced.
Calves are extremely unsettled and will hyperactively cross suckle after feeding.
Calf management is high.
Although cheap, bucket feeding should be avoided as the most unnatural and unhealthy system for a calf.
Just because buckets are cheap, or even free, doesn’t mean you should use them to feed calves. Bucket fed calves need a lot of intervention so the 'free' bucket ends up costing you in the long run.