Concentrations of luteinizing hormone and follicle-stimulating hormone in the serum of sexually intact and neutered dogs

Patricia N. Olson From the Department of Clinical Sciences (Olson) and the Department of Physiology (Nett), Colorado State University, Fort Collins, CO 80523, and the Carlson Animal Clinic, 1015 S Taft Hill, Fort Collins, CO 80521.

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John A. Mulnix From the Department of Clinical Sciences (Olson) and the Department of Physiology (Nett), Colorado State University, Fort Collins, CO 80523, and the Carlson Animal Clinic, 1015 S Taft Hill, Fort Collins, CO 80521.

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Terry M. Nett From the Department of Clinical Sciences (Olson) and the Department of Physiology (Nett), Colorado State University, Fort Collins, CO 80523, and the Carlson Animal Clinic, 1015 S Taft Hill, Fort Collins, CO 80521.

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Summary

Concentrations of luteinizing hormone (lh) and follicle-stimulating hormone (fsh) were measured in serum samples obtained from 100 dogs. Groups (n = 25/group) consisted of sexually intact and ovariohysterectomized bitches and sexually intact and castrated male dogs. Mean (± sd) concentrations of lh in the serum of sexually intact and ovariohysterectomized bitches were 1.2 (± 0.9) and 28.7 (± 25.8) ng/ml, respectively. Mean concentrations of fsh in the serum of sexually intact and ovariohysterectomized bitches were 98 (± 49) and 1,219 (± 763) ng/ml, respectively. Mean concentrations of lh in the serum of sexually intact and castrated male dogs were 6.0 (± 5.2) and 17.1 (± 9.9) ng/ml, respectively. Mean concentrations of fsh in the serum of sexually intact and castrated male dogs were 89 (± 28) and 858 (± 674) ng/ml, respectively. In addition to history, physical examination results, and other laboratory values, the measurement of serum gonadotropin concentrations may aid in determining whether dogs have been neutered.

Summary

Concentrations of luteinizing hormone (lh) and follicle-stimulating hormone (fsh) were measured in serum samples obtained from 100 dogs. Groups (n = 25/group) consisted of sexually intact and ovariohysterectomized bitches and sexually intact and castrated male dogs. Mean (± sd) concentrations of lh in the serum of sexually intact and ovariohysterectomized bitches were 1.2 (± 0.9) and 28.7 (± 25.8) ng/ml, respectively. Mean concentrations of fsh in the serum of sexually intact and ovariohysterectomized bitches were 98 (± 49) and 1,219 (± 763) ng/ml, respectively. Mean concentrations of lh in the serum of sexually intact and castrated male dogs were 6.0 (± 5.2) and 17.1 (± 9.9) ng/ml, respectively. Mean concentrations of fsh in the serum of sexually intact and castrated male dogs were 89 (± 28) and 858 (± 674) ng/ml, respectively. In addition to history, physical examination results, and other laboratory values, the measurement of serum gonadotropin concentrations may aid in determining whether dogs have been neutered.

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