Well done! Especially with a very protective mama. Getting him latched on & mama's colostrum is half the battle. I give weak calves Nursemate ASAP, it stimulates the sucking response, and Vitamin B Complex.
One of the best purchases I made was the Trusti Tuber Oral Calf Feeder. It makes tubing virtually foul proof! There is a mouth piece that you insert into the mouth, the calf generally latches on but if not, secure it in his mouth with your hand. You adjust the length of the tube via a knob, contingent on the size of the calf, and slide it in - it automatically goes down the esophagus. The bottle has a vent so no awkward squeezing, the fluid (colostrum, electrolytes, replacer) just flows. Link below but there are videos online.
The Trusti Tuber Oral Calf Feeder Kit is designed to reduce stress, discomfort, and the chance of injury for the calf. Kit includes (1) Antahi Feeder Bottle w/ vent, (1) Trusti Tuber (Mouthpiece, Tube & Bottle Attachment), and (1) Suckle Up Cape (Bottle Cap with Peach Teat Nipple)
www.jefferspet.com