Focus on feed hygiene and gut health for NAE

To achieve the goal of no antibiotics ever, the industry needs to look at all areas of the production system. Optimising management, health and nutrition, whilst reducing exposure to pathogens. Both gut health and feed hygiene are key drivers to reduce the need for antibiotics. This is where the use of targeted feed treatments and additives can help.

Feed Hygiene

Controlling the risk of contamination is a difficult task as risks occur throughout the production process.

These include:

• moulds (mycotoxins)
• oxidation of fats and oils
• heavy metals
• dioxins and pathogenic bacteria – such as Salmonella and E. coli.

All raw materials should be checked for harmful substances and preventative measures employed. ProPhorce Feed Hygiene (Perstorp) are a range of products that combine an optimised selection of organic acids and essential oils to help maintain optimal feed hygiene.

The effectiveness of ProPhorce SA Exclusive (from this product range) at reducing enterobacterial load, was compared to heat treatment alone, formic acid and four other feed hygiene solutions. The trial carried out in Tecaliman, France, measured the initial bacterial load, level after treatment and after cooling. The latter process creates condensation and the air used may be dirty; allowing mould and bacteria like E. coli to grow.

Figure 1 – Reduction of enterobacteria load in mash feed through heat treatment and consecutive recontamination prevention through feed hygiene additives. Not all additives prove equally effective.

Figure 1 shows that heat treatment isn’t sufficient for full protection, as it doesn’t prevent re-contamination, also demonstrating that feed hygiene solutions are not equally effective. After heat treatment at 65°C the levels of enterobacteria were still unacceptable following cooling. In contrast, a combination of heat treatment and product supplementation resulted in an enterobacterial reduction of more than 3 log CFU.

Non-pathogenic stressors and gut health

Pressure on gut health is not only caused by pathogens in feed but also by physiological and psychological stresses, medications, insufficient feed and imbalances in the gut microflora. These negative influences may result in a leaky gut. Increased intestinal permeability means that harmful agents can pass over the intestinal barrier and enter the blood circulation and cause systemic issues.

For healthy and productive livestock, external stressors should be reduced as much as possible. Providing high quality, clean feed and drinking water – at the same time ensuring easy access to both – will help to support gut health. Feed formulation and raw material selection can also have a significant effect on the incidence of leaky gut.

Butyric acid supplementation

The SCFA butyric acid is naturally produced in the colon during fermentation of dietary fibres. It promotes gut balance by several well researched mechanisms within the gastro-intestinal tract:

• Supports gut development
• Improves gut barrier function
• Supports development of a favourable gut microbiota
• Enhances feed digestibility
• Supports the immune system

Butyric acid has long been used as a feed additive in a coated form; due to its volatility and odour. However, the coating that protects it from degradation in the stomach takes up much of the product weight. In order to optimise the beneficial effects of butyric acid, esterifying technology has been used to create tributyrin. Butyrins are hydrolysed after the stomach, in the small intestine, ensuring butyric acid is released and delivered where it is most effective. Butyrins are added at a lower dosage than coated products for the same results due to a higher concentration of butyric acid content. ProPhorce SR (Perstorp) also has benefits in terms of stability and handling for feed production.

Figure 2 – Faeces scoring of weaning pigs comparing diets without tributyrin with diets including tributyrin (ProPhorce SR).

To evaluate the effect of ProPhorce SR 130 a trial was carried out at the University of Illinois in weaning pigs. Faeces quality score was measured in pigs, fed either a commercial control ration or one containing the product, for 5 weeks. Poor faeces scoring is indicative of a gut health issue – in the trial fewer pigs had scores over 3 and 3.5 (where a score of 1 was normal and 5 was liquid), when they were fed supplied with the tributyrin product (Figure 2). When tracked over the 35 days there was a clear improvement in faeces consistence in pigs fed the product – particularly between day 10 and 22 – a critical period.

Clean feed and a healthy gut

With the aim of reducing the need to treat with antibiotics the focus needs to be on prevention. Reducing pathogenic pressure from feed (and water) is key and feed hygiene strategies should not only aim to reduce enterobacterial levels but also to prevent recontamination.

The organic acid product studied is a highly effective tool for the promotion of feed hygiene. Whilst the benefits of butyric acid are well known, efficient dosing and delivery is essential to get results. Tributyrin is a powerful tool to deliver butyric acid and to obtain its well established benefits for gut balance. Trials have demonstrated the advantages to livestock in terms of growth and feed efficiency – all helping to reduce the need for antibiotics.

Author: Sofia Rengman, Business Development Manager, Animal Nutrition, Perstorp, Sweden