Failure to raise a calf grounds for culling?

I had a calf born on the 29th didn't ever seem all that Thrifty. I never saw it and nurse or even really showing interest in it. The mom did lick it clean and would come over mooing at it a little bit here and there, but the calf just wasn't really active. It has been in the upper 90s here and I know that's pretty stressful on the animals especially a newborn. I just don't know how much effect the Mom would have on the baby in this type of weather and if it's worth keeping her around for another year? This is her second calf last year was her first and she ended up stepping on his hip and we had to put it down to. But I'm thinking that might have been a freak accident but at this stage of the game two failed calves sounds like a one-way ticket for me. Any thoughts? What would you do in this situation or what would you have done?

Failure to raise a calf grounds for culling?