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“Ammonia is part of the rumen fermentation process and is a


starting point in the production of milk protein,” adds Dr van Zijderveld. “So the action of the nitrate results in less methane and supports more sustainable milk production.” By including SilvAir®


in dairy diets at the recommended rates,


methane emissions have been cut by up to 10%, with no negative impact on performance. This represents a reduction in the production of CO2


equivalent of 1kg per cow per day when included at a rate of 1.6% of the total diet dry matter intake in dairy diets.


It is safe to use and stable in compound feeds at these rates and has been shown to have no adverse effects on intakes. “We only recommend its use in compound feeds or blends. Much


of the trial work has been carried out in total mixed rations, where a premixed feed with the product included at the recommended rate is supplied. Feed plants operate very controlled systems so these rates can be followed carefully, and any risks associated with poor mixing or using the wrong inclusion rates are minimised.”


Cost-effective Methane-reducing feed products are playing a valuable part in promoting sustainable milk production. “But when it comes to improving the carbon footprint of milk production, the cost-benefit is only realised where there is a business incentive model, such as one from milk processors, retailers or governments. “These are beginning to emerge, and Cargill is speaking to various


stakeholders to ensure its feed product is an integral part of the toolkit used on farms to help farmers meet the targets imposed.” In Belgium, SilvAir®


Asked if this will make a significant contribution to the dairy herd’s


carbon footprint, Dr van Zijderveld explains that as 40% of the carbon footprint in milk production comes from enteric methane production, a 10% cut in the latter will amount to a 4% drop in the overall carbon footprint of milk production. “So yes, this product can play an important part in reducing the carbon footprint in dairy – and in beef production. And it has an added benefit of providing a valuable protein source so can contribute to sustainable feed use.” “But the industry must remember that reducing enteric methane


emissions is just one factor. Many other factors will contribute to the lower carbon footprint, but nutritional technologies are important as they typically support more efficient production techniques.”


Alternative protein SilvAir®


list of technologies to reduce methane emissions and is, therefore, eligible for a government subsidy. In the Netherlands, Friesland Campina is introducing an incentive system to reduce the carbon footprint and included SilvAir®


in its library of recommended products


for reducing methane in dairy cows from January 2023. Here in the UK, Cargill is making inroads into its inclusion in


recommended products in carbon auditing bodies. It is included in the online carbon footprint calculator Cool Farm Tool’s product listings and can, therefore, be used to adjust the on-farm carbon footprint through reduced methane output. “Food production is now more complex as producers must add


welfare and carbon emissions into their business’s sustainability, alongside health, performance and economic parameters,” said Dr van Zijderveld. “We are committed to helping farmers to simplify the challenges by


produces ammonia in the rumen just as dietary protein does.


“So the inclusion of this feed product could allow for a reduction in dietary protein to accommodate this. It can therefore mitigate some of the consequences facing farmers of price-volatile and increasingly expensive feed protein ingredients,” he added. “But diets should be reformulated. There is a limit to the amount


of ammonia that can be used for milk production, and this will be met in a well-balanced dairy ration. Excess ammonia is wasteful and counterproductive.” Based on its nutritional value and supported by trials, 100g of has been shown to replace 40g of feed-grade urea or 250g of soyabean meal in dairy diets. Also, 100g of SilvAir® can replace 60g of


SilvAir®


limestone in cow diets, which is a source of calcium and used in dairy mineral packs for milking cows.


PAGE 32 JANUARY/FEBRUARY 2023 FEED COMPOUNDER


offering solutions that will promote greater sustainability. Management, nutrition and feed additive strategies will all play a part. SilvAir®


is a


great example of a feed product that can help farmers meet these environmental challenges while maintaining animal performance.” More information on SilvAir®


is available on www.provimi.eu/uk-silvair SilvAir® is authorised for use in animal


feed under EU regulations and in the UK. It must be used in compound feeds at the recommended inclusion rates, that are based on scientific research. Diets that include SilvAir® must be reformulated to ensure correct amounts of crude protein are supplied and excess levels are avoided.


is included on the Belgium Feed Association’s


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