Prevention of breeding in the male

image of Prevention of breeding in the male
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This chapters considers both the medical and surgical approaches to the prevention of breeding in the male cat or dog.

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4.1 New methods of contraception that inhibit either the production or function of sperm are currently under development. Many potential targets have been identified along the pathway from spermatogonial stem cells to fertilization. A partial list associated with the putative stage of the pathway is shown. (Reproduced from with permission from )
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4.2 Hypothalamic–pituitary–testicular axis. Spermatogenesis requires a high intratesticular concentration of testosterone (T). Addition of a progestogen or a GnRH agonist results in cessation of GnRH production, which inhibits production of LH and FSH. In the absence of gonadotrophins, intratesticular and serum testosterone decline to levels that are insufficient to support spermatogenesis and libido. (Redrawn after with permission from )
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4.4 Marked testicular atrophy was present 6 months after GnRH vaccination of a cat (right) compared to sham-treated cat (left). The scale is in centimetres. Penile spines were still well developed in the sham-treated cat. Penile spines were absent in the GnRH vaccinated cat. (Reproduced from with permission from )
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4.6 Laparoscopic-assisted cryptorchidectomy. The animal has been tilted slightly to the contralateral side to facilitate visualization of the retained testis. The testis retained in the abdomen is grasped with 5 mm toothed grasping forceps and elevated to the abdominal wall. The testis is exteriorized for ligation and transection of the vascular supply and ductus deferens. (Redrawn after with permission from the ). Drawn by S.J. Elmhurst BA Hons (www.livingart.org.uk) and reproduced with her permission.
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