1887

Physiology and endocrinology of the male

image of Physiology and endocrinology of the male
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Abstract

This chapter looks at the male reproductive system and its four functions; anatomy; physiology; spermatogenesis; puberty; normal mating behaviour in dogs and cats; semen collection and evaluation and fertilization.

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/content/chapter/10.22233/9781905319541.chap2

Figures

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2.1 Hypothalamic–pituitary–gonadal axis demonstrating the site of hormone production and feedback loops. ABP = androgen-binding protein; FSH = follicle-stimulating hormone; LH = luteinizing hormone.
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2.2 Changes in hormone concentrations associated with normal and pathological conditions of the hypothalamic–gonadal axis. Normal. Hypothalamic dysfunction. Pituitary gland dysfunction. Leydig cell dysfunction (or absence of the testes). FSH = follicle-stimulating hormone; GnRH = gonadotrophin-releasing hormone; LH = luteinizing hormone.
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2.3 Changes in hormone concentrations following administration of exogenous GnRH in normal and pathological conditions of the hypothalamic–gonadal axis. Normal. Hypothalamic dysfunction. Pituitary gland dysfunction. Leydig cell dysfunction (or absence of the testes). FSH = follicle-stimulating hormone; GnRH = gonadotrophin-releasing hormone; LH = luteinizing hormone.
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2.4 Changes in hormone concentrations following administration of exogenous hCG in normal and pathological conditions of the hypothalamic–gonadal axis. Normal. Hypothalamic dysfunction. Pituitary gland dysfunction. Leydig cell dysfunction (or absence of the testes). FSH = follicle-stimulating hormone; hCG = human chorionic gonadotrophin; LH = luteinizing hormone.
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2.5 Concentrations of plasma testosterone prior to and after administration of 200 IU human chorionic gonadotrophin in six entire dogs (mean value = black line) and five castrated dogs (mean value = dashed line).
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2.6 Stages of spermatogenesis compared with the respective stages of oogenesis.
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2.7 Normal mating in the dog. Intromission. Copulatory tie.
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2.8 Morphological appearance of canine sperm.

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