[Protein utilization of mixed feed rations in lactating pigs with reference to the essential amino acid content of the feed proteins. 3. Report. Correlation between the protein metabolism data and the amino acid content of the dietary protein].

Protein utilization data were established in N balance trials with lactating sows fed various dietary proteins. The data obtained were compared with the amino acid indices of the dietary proteins and regression equations were established for the relations existing between these data. Additionally, simple and multiple regressions were calculated for relationships between the levels of N balance and the levels of crude protein intake, digestible crude protein, lysine per kg of milk production or lysine and all the other essential amino acids per 10 g of milk N. A relation was found between the level of daily lysine intake and all the other essential amino acids and the level of productive N utilization.