by win

Hormones – Chemical messenger secreted fromendocrine gland.

Behavior – Response of an individual with respect to

stimulus.

The hormones and behavior are closely interlinked.

Mood of an animal determined by particularhormones.

Animals – Insensitive to stimuli when hormones arenot available.

Animal reproductive behavior is seasonal basedon hormonal action. During the breeding season, the concentrationof sex hormones in blood is all higher level. Melatonin secrete from pineal gland. Melatonin – inhibitory effect on growth ofgonads. Pituitary hormone cause ovulation, growth ofovary.

Female lay eggs under influence of LH.

Progesterone induces incubation behavior.

Prolactin inhibits secretion of FSH and LH.

When prolactin level decreases, FSH and LHagain release and sexual cycle repeats.

Hormones produce bodily changes under

influence of certain type of stimuli.

Hypothyroidism may delay sexual

maturation and inhibitory for production of sexbehavior.

Pituitary gland to secrete LH and causeovulation.

In vertebrates hormones regulate maternal

behavior.

Doves feed their young one’s.

Pituitary hormone prolactin influence secretion

of milk.

Prolactin - responsible development of feeding

behavior.

If nerve supply is from crop wall temporarily

anesthetized prolactin secretion stop.

Progesterone – Incubation

In female rabbit – nest building – oestrogen & progesterone.

Prolactin level high in blood of female mice.

Prolactin – maximum care, to new born.

LH & Progesterone – nest building in mice.

Influence of male sex hormone.

Testosterone – aggressive behavior in young animals.

Males more aggressive than females.

Pituitary gonadal, pituitary adrenal axis.

Under influence of gonadial hormones.

E.g. Mongolian Gerbil

Males mark their territory by oil secretion.

Adrenal Cortex – corticoids, steroid hormones.

Adrenal Medulla– Epinephrine, Nor epinephrine.

Fear, Aggression, Sexual behavior.

Oestrogen production of pheromones in females.

Androgen, Oestrogen – development and

maintenance of reproductive and secondary sex characteristics.

Effect of feeding, energy balance, regulate enzymes, body weight.

Thyroxin indirect effect in feeding & energy

balance.