Literaturrecherche

Literatur Marx G, Jurkevich A, Großmann R (2004) Effects of estrogens during embryonal development on crowing in the domestic fowl. Physiol Behav 82(4):637-645, DOI:10.1016/j.physbeh.2004.05.010

Literatur Rushen J, Schwarze N, Ladewig J, Foxcroft GR (1993) Opioid modulation of the effects of repeated stress on ACTH, cortisol, prolactin and growth hormone in pigs. Physiol Behav 53:923-928

Literatur Müller C, Ladewig J, Thielscher H-H, Smidt D (1989) Behaviour and heart rate of heifers housed in tether stanchions without straw. Physiol Behav 46:751-754