Patterns of growth, body composition, food intake and efficiency can all be described with great sim plicity in terms of age. If, however, chronological and physiological age are not the same for different species, breeds and invididuals, genetic comparisons made at the same age become extremely complex. In the same way, growth variables (e.g. body fat) can quite effectively be related to body weight, but genetic comparisons made at the same body weight again require complex biological interpretations. The intrinsic d ifficulty is highlighted when it becomes impossible to make comparisons at the same age or bodyweight, for example, between Oxford Down and Soay sheep at the normal slaughter weight of 35 kg.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 218–230, 1982
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