Boosting digestibility of starch in corn silage using RONOZYME®
RumiStar™
The ruminal starch degradability of maize silage depends on the growing and harvesting conditions. When this is low, an enzyme such as RONOZYME®
hence animal production, fertility and herd profitability. By Sion Richards, Ruminant Specialist EMEA at DSM
For all dairy farmers, achieving herd efficiency and increasing milk yield are top priorities. For this reason, dairy producers invest in maize silage and maize grain that will deliver the most in terms of energy concentration as well as cost savings. In this process, special attention is paid to the starch content of maize (a potent source of energy for milk production) and its rumen degradability, as well as fibre content and digestibility. Maize silage and crimped maize are typically high in starch availability and therefore result in the production of good quality milk. As ruminal maize starch digestibility is strongly influenced by maize maturity, farmers have found maize silage to be higher in by-pass starch which means less starch is being digested in the dairy cow rumen. This has a negative impact on feed utilization and waste of energy supply is associated with reduced cow performance i.e. lower milk production, decreased milk quality and poorer fertility as well as significant incurring costs. RONOZYME®
RumiStar™ is the first enzyme that works in
dairy cows, it is a natural enzyme produced by fermentation, which complements perfectly the amylases produced naturally by cows. It is a fully approved EU feed enzyme for incorporation into mineral packs, compound feeds or blends.
Assessing starch digestibility Low starch digestibility can be assessed by farmers in a number of ways. For instance, a normal amount of starch in faeces is typically lower than 3%. However, decreased degradability in the rumen shifts starch digestion towards the intestines. As cows have a limited capacity to digest starch that is entering the duodenum, farmers may see higher amounts of maize grain and starch excreted in the faeces. This not only implies less available digestible starch to the cow but it is also indicates decreased rumen function resulting in reduced fibre digestion. In this case, dairy farmers can take a number of steps to promote better herd efficiency and milk productivity from the maize grain they produce. These include keeping maize silage for longer so as to increase starch digestibility, reducing the amount of maize silage in the ration, using a different grain processing method and / or increasing the amount of rumen fermentable starch. However, these solutions have limitations in application. This is because old maize silage, or crimped maize kept for an extended period of time, will also result in poor cow performance, and farmers may have limited space for prolonged maize storage. For
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this reason, a new approach involving the addition of RONOZYME® RumiStar™ the feed enzyme pure α-amylase that increases the speed of starch degradation in the rumen, has been recently developed to help maximize maize starch utilisation and fibre digestion in cows.
Increasing the digestibility of starch using RONOZYME® RumiStar™ Supplying an enzyme to dairy cow feed will increase the efficiency of maize starch utilisation and energy supply to the cow resulting in less starch wasted and less fibre in the faeces. RONOZYME®
RumiStar™
proved to do so by catalysing the breakdown of maize starch to oligosaccharides (carbohydrates composed of simple sugars) in the rumen. Oligosaccharides are then used as an energy source by fibre degrading microbes in the rumen and rate of fibre digestion is increased. Improved fibre digestibility delivers more acetate in the rumen which is then absorbed into the blood, enters the udder and is used to help produce milk fat in the cow. Rumen pH remains unchanged with the use of this particular feed additive, resulting in improved digestibility with no reduction in rumen health, more milk, a better energy balance and most significantly, better herd efficiency.
RumiStar™ can be added to the feed to boost degradability and
This has been confirmed by commercial trials with RONOZYME®
RumiStar™ in Germany and the Netherlands, which have shown “visible” effects on improved rumen digestibility demonstrated with NASCO sieving.
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