Yes, try to get colostrum, it is very beneficial to the future health of the calf. HOWEVER,...I have raised many bottle calves who never had colostrum, and I haven't lost one. Even back when the milk replacer products were not nearly as good as they are now. So do your best to get that colostrum, but if you can't, get a good medicated milk replacer and the calf will be fine. You can also ask your vet about colostrum products, there is a colostrum paste that many are using that seems to be pretty easy to use. Also keep in mind, after 24 hours of birth colostrum won't hurt,...but won't do a lot of good either.