The same trend was observed in another trial (Table 2). In this study the effect of the microbiota on the conjugated bile acid status and subsequent fat digestion was compared between birds reared in sterilised conditions and conventional reared birds. Birds reared in sterilised conditions showed a higher lipid faecal apparent digestibility compared to conventionally reared birds, confirming the negative effect of some bacteria on fat digestion. This can be explained by the difference in the concentration of conjugated bile salts.
The need for a nutritional emulsifier
Fat digestion is influenced by many factors (e.g. fat source, age). Less attention is given to the effect of the microflora. Considering the literature work stated above it should be an important factor to take into account. Orffa engineered a nutritional emulsifier to reach maximal potential in the intestinal environment and improve digestion. The most important parameter to choose the optimal emulsifier for every specific application is HLB (hydrophilic-lipophilic balance). An emulsifier with a low HLB is more fat soluble (lipophilic) and an emulsifier with a high HLB is more water soluble (hydrophilic). Due to the fact that an animal consumes almost twice as much water as feed, the intestine is a very watery environment. The goal of a nutritional emulsifier is to optimise the emulsification and micelle formation in the intestine and therefore an emulsifier with a high HLB (hydrophilic) is most efficient.
In recent years, several faecal metabolic studies with broilers have been performed by Orffa to examine the effects of the nutritional emulsifier, Excential Energy Plus. The results show that the nutritional emulsifier is able to increase energy (+76 kcal AMEn/kg), crude fat (+2.81%), dry matter (+1.41%) and crude protein (+1.68%) digestibility on average to a high extend versus the control treatment. The increase in digestibility seems to depend on the crude fat percentage in the diet.