Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)


Much emphasis is placed on rate of gain in attempts to improve meat animals. However, little attention is given to composition of the carcass, except as it is indicated by the conformation of the live animals, largely because carcass data can be obtained only for progeny or relatives of the animals chosen for breeding purposes. Rate of gain and composition of carcasses are both determined by the growth rates of the constituent tissues. Hence, if there is more heritable variation in fat deposition, for example, than in growth of bone and muscle, selection for faster total gains would increase the rate of fat deposition more than it would the rate of bone and muscle growth, and fatter carcasses would result.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.