a consistent supply of quality grazing, with the aim of achieving energy levels of 12 MJ/kg DM. The principles of the system are to ensure fresh grazing is available after each milking and to shut off paddocks once grazed to allow recovery and subsequent growth. A total grass yield of 14 – 15 t DM/ha and 75 – 80% sward utilisation efficiency are good targets to aim for. Careful management of the grazing platform and attention to detail, similar to the disciplines applied to winter feeding strategies, will help these targets be reached.
Somatic Cell Counts (SCC) It has long been recognised that animals with an elevated SCC are more likely to develop clinical mastitis, and have reduced milk quality and milk yield. However, whilst the significant cost of clinical mastitis is clearly understood, the financial implications of an elevated SCC can often be overlooked. Cornell University recently published a review examining the
relationship between individual cow SCC, dry matter intakes (DMI) and milk yield. The review concluded that an animal with a high SCC (considered to be 250,000 cells/ml), produced on average 1.6kg less milk/day that an animal with a SCC of 50,000 cells/ml. The high cell count animals had a reduced daily DMI but still produced 0.04kg less milk / kg DMI compared with the low SCC animals.
Unfortunately, the review did not then extrapolate the reduction in
milk yield as the SCC of the animals increased beyond 250,000 cells/ ml. However, what is clear is that the reduced yield and reduced feed efficiency are yet more reasons that SCC control within a dairy herd should be considered a financial priority.
Clean Air Strategy The UK Government has published its Clean Air Strategy which outlines how it proposes to tackle all sources of air pollution. It includes proposals to reduce emissions from farming, specifically ammonia emissions. The proposals mainly concern manure and slurry storage and spreading, spreading of urea-based fertilisers, nutrient planning (including organic and inorganic fertiliser use) and building design. Nutrition advisors will have a role to play to help farmers take practical action to reduce ammonia emissions by ensuring that levels of protein in livestock diets are well matched to nutritional needs. Investments in infrastructure and equipment that will reduce
emissions may be necessary (and may be grant funded) however, if producers are planning capital investment in livestock buildings and/or slurry or manure storage or spreading equipment now, they are advised to seek further advice before committing to investment which may not meet the requirements of future legislation.
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www.victaminternational.com FEED COMPOUNDER MARCH/APRIL 2019 PAGE 13
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