For the low-input system, it is inadequate to think
of genetic improvement only in terms of increases
in output traits, such as body weight, milk or
egg production, or fleece weight. Efficiency is
also a key criterion. Unfortunately, very little
is known about the genetic improvement of
intrinsic efficiency. Increased efficiency is usually
measured in terms of increased gross efficiency.
The increased gross efficiency observed in highproducing
animals results from the fact that a
lower proportion of the animals’ nutrient intake
is used for maintenance, and a correspondingly
For the low-input system, it is inadequate to thinkof genetic improvement only in terms of increasesin output traits, such as body weight, milk oregg production, or fleece weight. Efficiency isalso a key criterion. Unfortunately, very littleis known about the genetic improvement ofintrinsic efficiency. Increased efficiency is usuallymeasured in terms of increased gross efficiency.The increased gross efficiency observed in highproducinganimals results from the fact that alower proportion of the animals’ nutrient intakeis used for maintenance, and a correspondingly
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