Prediction of growth with kinetics of cell-free translation systems.

The kinetics of cell-free translation systems containing as main components washed rat liver polysomes and muscle cell sap from a muscle piece of the proband, can be used for predicting body growth rate or muscle tissue growth in cattle and swine. A muscle biopsy from the hindquarters of animals aged about 45 days is the source of the muscle fraction. It introduces into the translation systems the required aminoacylated tRNA and translational initiating and elongating factors containing the muscle cell sap fraction of the proband. Based on a polynomial regression of the type [Formula: see text] the coefficient of the multiple correlation between either the growth rate or the lifetime-related muscle mass (Y) of the carcass of boars aged 195±19 days or of bulls aged 450±20 days and the translational kinetics (T) is 0.60-0.8. A generalized expression of the relationship between growth criterions Y (muscle tissue growth rate or nutritional energy expenditure for the growth rate) is [Formula: see text] where S y (2) is the variance of the growth criterion; L is a constant, its value is approximately 2; and f(T) is the function mentioned above. If T is measured in sires and Y in male offsprings, the coefficient of the genetic correlation between a linear combination of Ti and Y is 0.6-0.9.