Vitamin levels

The vitamin content of feed ingredients is usually disregarded in diet formulation because of imprecision and variation on methods of analysis, characteristics of ingredients, and degradation of vitamins in storage and processing (Gaudré and Quiniou, 2009). Thus, vitamin levels in the vitamin premix are calculated to fully supply the vitamin requirements of swine. Also, it appears to be standard practice to add a margin of safety for vitamin levels beyond the NRC (2012) requirement estimates (Flohr et al., 2016). The margin of safety intends to account for fluctuations in daily feed consumption and degradation of vitamins in storage and processing.

Fact Sheet: Vitamin Sources for Swine Diets