Effects of androgens and oestrogens on the behaviour of chicks in an imprinting situation.

in Zeitschrift für Tierpsychologie (1979), 49(1), 55-64

The behavioural effects of testosterone propionate (TP), 5alpha-dihydrotestosterone (DHT) and oestradiol benzoate (OB) were investigated in day-old chicks during imprinting sessions to a duck model. TP ... [more ▼]

The behavioural effects of testosterone propionate (TP), 5alpha-dihydrotestosterone (DHT) and oestradiol benzoate (OB) were investigated in day-old chicks during imprinting sessions to a duck model. TP increased the duration of peeping while inhibiting the following reaction and the twitters. DHT had more or less the same effects while OB induces the reverse behavioural changes. The behavioural effects of hormone injections agree with behavioural sex differences observed in non-injected animals: males peep more than females which on the other hand produce more twitters. This could be related to sex differences in the hormonal status of the birds at hatching, as it is known that during incubation male chick embryos have higher plasma testosterone levels than females of corresponding ages. [less ▲]

Effects of exogenous gonadotropic and steroid hormones on the social behaviour and gonadal maturation of male domestic ducklings Anas platyrhynchos L.

in Archives Internationales de Physiologie et de Biochimie (1979), 87(4), 741-61

Male domestic ducklings were injected during their first month of life with mammalian gonadotrophins (ovine LH or FSH, HMG) or gonadal steroids (testosterone or oestradiol). LH and testosterone stimulated ... [more ▼]

Male domestic ducklings were injected during their first month of life with mammalian gonadotrophins (ovine LH or FSH, HMG) or gonadal steroids (testosterone or oestradiol). LH and testosterone stimulated sexual behaviour while oestradiol inhibited the increase of aggression observed in control birds during the experiment. The mammalian gonadotrophins did not increase plasma testosterone but nevertheless they all stimulated the testis growth. Several hypotheses which could explain this finding (stimulation of spermatogenesis without any apparent effect on testosterone) are discussed and the possibility of a direct action of LH on the sexual behaviour is analysed. Social displays were only moderately stimulated by testosterone and not at all by gonadotrophins. The hormonal controls of these behaviour patterns remains thus largely unknown. [less ▲]

Steroidal control of plasma luteiyizing hormone, comb growth and sexual behaviour in male chicks.

in Journal of Endocrinology (1978), 77(1), 149-50

Controle hormonal du comportement et de la croissance testiculaire chez la caille coturnix corturnix japonica

in Comptes Rendus Biologies (1977), 171(3), 656-63

Social behaviour of testosterone-injected male ducklings in the presence of oestrogen-treated females.

in Behaviour (1976), 57(3-4), 288-306

Effects of testosterone propionate on the social behaviour of groups of male comestic ducklings Anas platyrhynchos L.

in Animal behaviour (1975), 23(4), 926-31

One-month old testosterone-injected ducklings were observed in groups of three males and their social behaviour compared to that of oil-injected control birds. Most elements of adult sexual behaviour and ... [more ▼]

One-month old testosterone-injected ducklings were observed in groups of three males and their social behaviour compared to that of oil-injected control birds. Most elements of adult sexual behaviour and one pattern of aggressive behaviour (chest fight) occurred more frequently in the experimental animals. It was shown that the same hormonal treatment induces different behavioural responses in different animals. Unlike previous studies, no social displays were observed in the testosterone-injected ducklings. Possible explanations of this fact are discussed. [less ▲]

Dosage radioimmunologique de l'hormone folliculo-stimulante (FSH) hypophysaire de canard a l'aide d'un systeme de mammiferes

in Comptes Rendus des Séances de la Société de Biologie et de ses Filiales (1974), 168(1), 136-40