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Publications of Jacques Balthazart
Results 321-333 of 333.
  Testosterone metabolism and sexual behavior in the chick.Balthazart, Jacques  ; in Hormones and Behavior (1979), 12(3), 253-63 Detailed reference viewed: 3 (0 ULg)Effects of androgens and oestrogens on the behaviour of chicks in an imprinting situation.Balthazart, Jacques ; 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 ▲] Detailed reference viewed: 3 (0 ULg)Pheromones are involved in the control of sexual behaviour in birds.Balthazart, Jacques ; in Naturwissenschaften (Die) (1979), 66(1), 55-6 Detailed reference viewed: 5 (0 ULg)Photoperiodic control of testosterone metabolism, plasma gonadotrophins, cloacal gland growth, and reproductive behavior in the Japanese quail.Balthazart, Jacques ; ; in General and Comparative Endocrinology (1979), 39(2), 222-35 Behavioural and physiological effects of testosterone propionate and cyproterone acetate in immature male domestic ducks, Anas platyrhynchos.Balthazart, Jacques in Zeitschrift für Tierpsychologie (1978), 47(4), 410-21 The behavioural and morphological effects of testosterone propionate and of the antiandrogen cyproterone acetate were studied in male domestic ducks. Testosterone was also measured by radioimmunoassay in ... [more ▼] The behavioural and morphological effects of testosterone propionate and of the antiandrogen cyproterone acetate were studied in male domestic ducks. Testosterone was also measured by radioimmunoassay in the plasma of these birds to relate the behaviour to the actual circulating levels of hormone. Testosterone stimulates sexual behaviour but has few effects on social displays. There is no correlation between the individual variations of plasma testosterone and sexual behaviour. [less ▲] Detailed reference viewed: 8 (0 ULg)Steroidal control of plasma luteiyizing hormone, comb growth and sexual behaviour in male chicks.Balthazart, Jacques ; in Journal of Endocrinology (1978), 77(1), 149-50 Detailed reference viewed: 2 (0 ULg)Controle hormonal du comportement et de la croissance testiculaire chez la caille coturnix corturnix japonicaBalthazart, Jacques ; in Comptes Rendus Biologies (1977), 171(3), 656-63 Detailed reference viewed: 8 (1 ULg)Diurnal variations of plasma gonadotrophins in male domestic ducks during the sexual cycle.Balthazart, Jacques ; ; in General and Comparative Endocrinology (1977), 32(4), 376-89 Detailed reference viewed: 1 (0 ULg)Annual variation in reproductive behavior, testosterone, and plasma FSH levels in the Rouen duck, Anas platyrhynchos.Balthazart, Jacques ; in General and Comparative Endocrinology (1976), 28(2), 171-83 Detailed reference viewed: 4 (0 ULg)Social behaviour of testosterone-injected male ducklings in the presence of oestrogen-treated females.Balthazart, Jacques ; in Behaviour (1976), 57(3-4), 288-306 Detailed reference viewed: 3 (0 ULg)Effects of testosterone propionate on the social behaviour of groups of male comestic ducklings Anas platyrhynchos L.Balthazart, Jacques ; 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 ▲] Detailed reference viewed: 5 (0 ULg)Non-stationnarite et aspects fonctionnels du comportement agonistique chez Tilapia macrochir (Boulenger 1912) (Piscer: Cichlidae)Balthazart, Jacques in Acta Zoologica et Pathologica Antverpiensia (1974), 58(0), 29-40 Detailed reference viewed: 10 (3 ULg)Dosage radioimmunologique de l'hormone folliculo-stimulante (FSH) hypophysaire de canard a l'aide d'un systeme de mammiferes; ; Balthazart, Jacques et alin Comptes Rendus des Séances de la Société de Biologie et de ses Filiales (1974), 168(1), 136-40 Detailed reference viewed: 21 (1 ULg) |
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