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Synopsis
Two types of modified cockerels were produced by lesioning the hypothalamus: (1) functionally castrated, obese, with atrophied testes and combs, bearing lesions in the mammillary nuclei and posterior part of the ventromedial nuclei (FC) and (2) functionally castrated, obese, with atrophied testes, but with large combs, bearing lesions in the posterior part of the mammillary nuclei and part of the arcuate nuclei (FCLC).
Semen could not be obtained from either type of bird. Plasma testosterone concentrations, determined by radio‐immunoassay, were 25.5 ± 5, 125 ± 20 and 508 ± 272 ng/100 ml plasma, for the FC, FCLC and control birds respectively. Correlations were not found between comb weight and testosterone concentration within each of the different groups. Neuroendocrine aspects and some physiological effects of androgenic activity are discussed in the light of previous studies with similarly lesioned cockerels.
Notes
This investigation was supported in part by USPHS research grants A‐1804 and NB‐7585 from the National Institutes of Health, grants GB‐242 and GB‐6578 from the National Science Foundations, and grants 380 and 424 from the Nutrition Foundation.
Present address: Department of Poultry Science, The Hebrew University, P.O. Box 12, Rehovot, Israel.