JANUARY 2020 www.irishfarmersmonthly.com Feature 0-3 weeks Extra ME for maintenance (MJ/d) 0.00 1.06 2.11 3.17 4.23 5.29 >3 weeks Extra milk replacer (g/d) 0 55 110 165 220 275 Environmental Temperature (°C) 20 15 10 5 0 -5 Extra ME for maintenance (MJ/d) 0.00 0.00 0.00 1.06 2.11 3.17 Extra milk replacer (g/d) 0 0 0 55 110 165 Table 1. Estimated additional calf milk replacer required for a 50 kg calf consuming milk replacer containing 19.8 MJ/kg of ME (assuming 2.5% moisture)1,3 Provide dry, clean, draught-free housing Remember, the temperature below which a calf needs extra energy to keep warm is highly dependent on moisture levels and air speed – draughts of just 5mph can make calves 8°C to 10°C cooler. Bedding needs to be kept plentiful, clean and dry, and must allow calves to ‘nest’ in the straw. Provide effective barriers to draughts at calf level and provide places for the calf to shelter. Consider the use of calf jackets (that are breathable and water resistant) and/or the provision of an external heat source close to the calves. Cold weather does not only mean the winter months. Even the warmer spring months at temperatures of less than 10 to 15°C will be cold for a young calf. By ensuring calves are well fed will help to ensure they can continue to grow well and remain healthy. References National Research Council, Nutrient requirements of dairy cattle, 7th Edition 2001 2. Roland L, Drillich M, Klein-Jöbstl D & Iwersen M (2016) Invited review: Influence of climatic conditions on the development, performance, and health of calves. J. Dairy Sci. 99:2438–2452 3. Quigley J (2001) Calf Note #121 – Added CMR feeding in cold weather 1. THE ONLY PRECALVER FOR THE CALF AS WELL AS THE COW BECAUSE COLOSTRUM IS VITAL FOR CALVES VITAL FOR DRY COWS 19 IS +353 (42) 932 9176 | www.uniblock.ie