Just go back.
We got him to suck on his mother's teat for a few seconds and she kicked him gently away. Should I tie her feet?
I'm assuming you have her in a head catch or tied, so no I wouldn't tie her feet together. If she fights and falls could be injured or injure the calf or you. Might try smacking her, along with a Uhhhh, when she kicks, though.
I then milked about 8 oz out of her and gave it to him. He drank it all, I did milked another 8 oz and he did not want anymore.
So he drank 3 pints tonight? That's about right for his age, I think.
I was going to let her go out into the pasture with him, but I guess they will have to stay in another few days.
They cannot be turned out until you KNOW the calf is nursing and she is taking care of him.
Should I feed him tomorrow or just let him fend for himself?
Just keep doing what you're doing.....try to get him to nurse first, smack her if she kicks at him, and if it doesn't work feed him. You cannot let him go hungry for very long or he will get sick. There is always a chance that she will not take him.
Can I refrigerate the milk and then heat it tomorrow?
Yes, you can refrigerate the milk, re-heat it gently and feed the calf.
He seems constipated also. What should I do for that?
Mineral oil, both ends. I don't know how much....never had a constipated calf before. Sorry. Others will chime in that do know, though.
This is all new to me, and I don't want to loose him. I also don't want to bottle feed through the winter if I don't have to.
Considering the circumstances of the birth, you may have to. Especially if this is a first calf heifer.