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发表于 2013-10-10 15:43:49
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本帖最后由 牧童 于 2013-10-10 15:45 编辑
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Reasons for an inability to draw conclusions are not hard to find if the complications of the foregoing discussions are borne in mind. It is difficult to envisage that growing animals retarded at some point or points in their lives could be more efficient than animals fed continuously on a high plane of nutrition. The daily maintenance require ments of the former would at certain times satory growth can give a greater efficiency than continuous growth (e.g. Auckland et al., 1969, with turkeys (see Table 12.10) and Campbell and Dunkin, 1983, with pigs).
A further complicating factor will be the way in which the animal is partitioning nutrients at any point in time in the recovery period. This needs no further elaboration here as the efficiencies of deposition of the various tissues are discussed fully in Chapter 11, but the point to make is that differential tissue deposition within units of live weight compensatory growth complicates any assessment of relative efficiency unless body compositional changes are in some way monitored regularly over the period under consideration. Note for example the shifting composition of gains made by cattle in the work of Wright and Russell (1991) (see Table 12.6) and referred to already. |
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