The Value of a Performance Index for Predicting Income in Random Sample Egg Production Tests

Empirical index development for bioeconomic objectives in a three‐way cross in mice1

“…Such an approach was suggested by DICKERSON (1959, 1969) and illustrated for poultry in KINNEY et al (1969). A multiple regression approach allows evaluation of the resulting indexes from a more direct statistical viewpoint than is commonly done.…”

“…The interest of NEWMAN et al (1985a, b) was swine; which they biologically simulated with mice. Such an approach was suggested by DICKERSON (1959, 1969) and illustrated for poultry in KINNEY et al (1969). The economic weights in the conversion ratio were obtained by relating mouse costs and values in proportion to costs and values for a twolitter swine production system.…”

“…A multiple regression approach allows evaluation of the resulting indexes from a more direct statistical viewpoint than is commonly done. Such an approach was suggested by DICKERSON (1959, 1969) and illustrated for poultry in KINNEY et al (1969). Since the selection objective is a ratio of terms involving products of two or more traits, both linear and quadratic indexes were used to approximate more complex functions.…”