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Physiology and endocrinology of the male
/content/chapter/10.22233/9781905319541.chap2
Physiology and endocrinology of the male
- Author: Gary C.W. England
- From: BSAVA Manual of Canine and Feline Reproduction and Neonatology
- Item: Chapter 2, pp 13 - 22
- DOI: 10.22233/9781905319541.2
- Copyright: © 2010 British Small Animal Veterinary Association
- Publication Date: January 2010
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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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. © 2010 British Small Animal Veterinary Association
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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. (a) Normal. (b) Hypothalamic dysfunction. (c) Pituitary gland dysfunction. (d) Leydig cell dysfunction (or absence of the testes). FSH = follicle-stimulating hormone; GnRH = gonadotrophin-releasing hormone; LH = luteinizing hormone. © 2010 British Small Animal Veterinary Association
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2.2
Changes in hormone concentrations associated with normal and pathological conditions of the hypothalamic–gonadal axis. (a) Normal. (b) Hypothalamic dysfunction. (c) Pituitary gland dysfunction. (d) 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. (a) Normal. (b) Hypothalamic dysfunction. (c) Pituitary gland dysfunction. (d) Leydig cell dysfunction (or absence of the testes). FSH = follicle-stimulating hormone; GnRH = gonadotrophin-releasing hormone; LH = luteinizing hormone. © 2010 British Small Animal Veterinary Association
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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. (a) Normal. (b) Hypothalamic dysfunction. (c) Pituitary gland dysfunction. (d) 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. (a) Normal. (b) Hypothalamic dysfunction. (c) Pituitary gland dysfunction. (d) Leydig cell dysfunction (or absence of the testes). FSH = follicle-stimulating hormone; hCG = human chorionic gonadotrophin; LH = luteinizing hormone. © 2010 British Small Animal Veterinary Association
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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. (a) Normal. (b) Hypothalamic dysfunction. (c) Pituitary gland dysfunction. (d) 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). © 2010 British Small Animal Veterinary Association
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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. © 2010 British Small Animal Veterinary Association
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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. (a) Intromission. (b) Copulatory tie. © 2010 British Small Animal Veterinary Association
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2.7
Normal mating in the dog. (a) Intromission. (b) Copulatory tie.
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2.8
Morphological appearance of canine sperm. © 2010 British Small Animal Veterinary Association
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2.8
Morphological appearance of canine sperm.