The genetic parameters associated with selection for increased body weight in the domestic fowl are well documented (Kinney, 1969). Siegel (1962) summarized 176 published he ritab ility estimates of body weight obtained for chickens 6 to 12 weeks of age and found a median h eritab ility of .41 for these estimates. Although changes in body weights that accompany selection for growth are known and to some degree predictable, the mechanisms involved in these changes are less well established.

H. L Marks

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 681–689, 1982
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