One of the first things I learned when I started as a nutritionist in a brand that specialized in piglet feeds was that quality of raw materials is king. And, among them, it is whey that can make or break any piglet feed.
I recently received an email from a client in Canada. He had read some reports that stated there should be a specific ratio between lysine and protein -- something like 7.5:1, which is very close to the lysine concentration in lean tissue. His question was how to achieve this level without overdoing it with crude protein or lowering the total lysine in the diet.