1. The main problem remains the slaughter itself. If cows were not slaughtered for meat, this would not happen. Therefore, those horrible pictures are another good reason to stop eating meat and buying leather products.
2. The slaughter itself is so horrible and so violent so the calf issue seems to me less important. There are good reasons to believe that the calf suffers less than a mature cow, and certaintly not more. Killing two cows is in now way better than killing a pregnant cow and its calf.
3. Anyhow, all of this can be avoided by setting a rule that no cow will be slaughtered pregnant or in the third trimester.
Although there are good reasons to stop having diary products, I don't this THIS is one of them. THIS is another good reason to stop eating meat.