This subject can be opened with a definite statement that the two propositions within the title are indeed attainable to some extent. However, at this point the definite statements end as there are many variables which influence the relative weights of individual muscles and make some genetic and nutritional comparisons extremely difficult. Some of the affects achieved under the influence of these variables are reasonably-well documented, others are not. How or why some changes are achieved can be proposed with confidence, regarding others we are ignorant. From this basis it must be immediately clear that much of the discussion to follow will range from scientific «certainty» to informed guessing

R. M Butterfield, R. T Berg

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 625–633, 1974
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