A professional who develops systems of breeding desirable characteristics, such as improvement in strength, maturity rate, disease resistance, and meat quality, into economically important animals. Responsibilities include:

• Determines generic composition of animal populations, and heritability of traits, utilizing principles of genetics.
• Crossbreeds animals within existing strains, or crosses strains to obtain new combinations of desirable characteristics.
• Selects progeny having desired strains of both parents, and continues process until acceptable result is obtained.