Feed into Milk

Animal 70 kg ewe with twin lambs producing 3 kg milk/day, y = 11. 

Yield of ATP depends on content of crude protein in feed 

ATP yield (ATPy) ssp (mol/g DM) ATP yield (ATPy) cone, (mol/g DM) ATP yield (ATPy) forage (mol/g DM) 

Efficiency of conversion depends on rumen outflow rate 

The supply of effective degradable nitrogen (edn) from each feed is calculated from the degradability characteristics of the nitrogen fractions determined in sacco and the appropriate outflow rates for the three fractions using the following equation  

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Vreman, K., N.G. van der Veen, E.J. van der Molen, and W.G. de Ruig. 1986. Transfer of cadmium, lead, mercury and arsenic from feed into milk and various tissues of dairy cows chemical and pathological data. Neth. Jour. Agric. Sci. 34 129-144. 

The science of animal nutrition continues to advance and this has necessitated, to varying degrees, the updating of most chapters. In particular the new developments in dairy cow nutrition in the Feed into Milk System and the new nutrient requirements of pigs proposed by the British Society of Animal Science have been incorporated in the middle chapters and the Appendix tables. In addition new information, published in recent reviews of nutrient requirements by the National Research Council of the United States, and the Commonwealth Scientific and Industrial Research Organisation of Australia has been included. 

From Thomas C 2004 Feed into Milk A New Applied Feeding System for Dairy Cows, Nottingham, Nottingham University Press. 

In the UK, the ME requirements of dairy cows for maintenance and lactation can be calculated from the curvilinear relationship between milk energy derived from dietary ME and dietary ME directed towards milk production proposed by Feed into Milk 2004. 

The UK Feed into Milk protein system for dairy cows... 

BOX 16.7 Calculation of the Feed into Milk protein requirements of a 600 kg cow... 

Calculate the daily metabolisable energy requirements of a dairy cow weighing 625 kg, yielding 33 kg milk with 39 g/kg fat, and losing 0.5 kg/day on a diet having aq = 0.62, using AFRC (1993) and Feed into Milk (2004). 

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