By Henry Swan
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Extra info for Nutrition Conference for Feed Manufacturers. University of Nottingham, Volume 7
Blaxter and Wainman (1966) published estimates of the fasting metabolism of Ayrshire steers. 12 of the ARC (1965) report. Fasting metabolism values when reduced to a ftr*·73 basis use the fasted weight of the animal concerned. The ARC ME system appears to use live weight when calcu lating fasting metabolism values tô a live-weight basis. Since fasted weights average 90% of live weight, this amounts to including a 10% safety margin in calculating maintenance requirements. 02W (Meal) This equation is of adequate precision, bearing in mind the accepted 10% variation in fasting metabolism between individual animals, and has the advantage of also being based linearly on W 1 · 0 .
On average the direct response to additional feeding in the first 9-10 weeks was no more than about one—third of the total response over the whole lactation. These findings raise doubts as to the value of recommendations based on current performance, at least until after peak yield has been achieved. Gains in body weight are to be expected and encouraged in mid- and late lactation and losses in body weight are probably unavoidable in early lactation. This table, therefore, allows for a reasonable interpretation of a situation where energy intake and milk output are known but live-weight change is unknown.
0 Meal. The ARC report proposed that maintenance requirements should vary with jv0·73 but within the normal range of 53 Application of a metaboli sable energy system cow live weights (350-650) kg there is no loss of pre cision if the simpler base of IV1·0 is accepted. ) Effects of Level of Feed Corrections It is possible that the high estimates of k^0 in the ARC (1965) report were compensated by the high level of feeding corrections also included in that report. The estimate of the effect of level of feeding on digesti bility and metabolisability was based on work conducted with non-lactating animals which seldom consumed more than twice their maintenance requirement.