i have raised lots of orphans, lambs, kids, calves, kittens, pigs, puppies, pigeons , usually i keep a milk cow around, and a milk goat, right now i have a sheep that is milking rather well. It is good practice to keep clostrum in the freezer, grab it and freeze it at every opportunity. The store bought stuff isnt any where near as good as the real deal but it will get you by in a pinch until you get your hands on the real stuff.If you have no critters milking and no milk in the freezer then There is almost always some one who has some thing haveing babies at the same time that you are, ask around, generally people will let you have clostrum and or milk as long as you will do the milking. If all else fails use the tried and true baby critter formula canned evaporated milk and corn syrup, add water to dilute to which ever species you are feeding and corn syrup the same. corn syrup has a laxative effect so be gentle with it. kittens and piggies and human babies need more syrup than goats and calves. some animals have a very high sugar content in their milk as well as a higher fat content so do your research and dilute accordingly. The formula has saved many little lives but it does not replace clostrum, i always prefer the real deal and do my best to locate the closest milk that i can find.