Literaturrecherche

Literatur Löliger HC (1986) Poultry health as a criterion of welfare. Poultry 2:34-37

Literatur Breden L, Wegner R-M (1986) Nest site selection : birds like to scratch before laying. Poultry 2:6-9

Literatur Hartmann W, Heil G (1985) West-German random-sample-tests : predict performance differences. Poultry 1:26-28