bucket baby
n.— «“What is a Bucket Baby?” “A foal or calf or whatever that has not got a mother to nurse for whatever reason and it fed milk or milk replacer with a bucket instead of a bottle.”» —“Re: ’Bucket Baby’ Question” by JRDVMDIVER Usenet: rec.equestrian Aug. 22, 1997. (source: Double-Tongued Dictionary)