Is this a calf that will always be fed or will he be drinking from the cow? If you're going to be feeding him maybe you can get him to drink from a bucket, put milk on your finger and stick it in his mouth when he starts sucking good on your on your finger put his mouth down in the milk till he starts to drink on his own sometimes it can take some work to get him to do this. If you keep tubing him he'll get dependent on that and won't want to drink on his own. Good luck