Libraries at University of Nebraska-Lincoln


Document Type


Date of this Version



Thesis (M.S.)—University of Nebraska—Lincoln, 1971. Department of Animal Science.


Copyright 1971, the author. Used by permission.


Increased consumer demands for pork with higher proportions of lean and less fat have caused interest in the hormonal combination of diethylstilbestrol and methyltestosterone. Recent research has indicated that a hormonal combination of diethylstilbestrol and methyltestosterone has a marked effect on protein synthesis in the body.

Research has also indicated that increased dietary protein levels can increase lean pork production. However, at the present time, economy restricts this method for increasing carcass leanness in commercial production.

This study was conducted to evaluate the effect of hormonal combination and dietary protein level on the carcass characteristics of two genetic lines of swine.

The experiment was conducted in the winter of 1969, using 56 Hampshire barrows and 64 Gene Pool barrows from the University herds. The Hampshire (lean line) selected for carcass leanness and the Gene Pool (fat line) a closed herd with no selection for carcass leanness. All pigs were housed inside and pen fed on concrete, slotted floors with feed and water available ad libitum.

Advisor: Roger W. Mandigo