Title : Phenotypic variation in testosterone and luteinizing hormone production among boars: differential response to gonadotropin releasing hormone and adrenocorticotropic hormone.

Pub. Date : 1983 Sep

PMID : 6315094






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1 Variation in ability of boars to produce testosterone and luteinizing hormone (LH) in response to both gonadotropin releasing hormone (GnRH) and adrenocorticotropic hormone (ACTH) stimulation, as well as quantitative relationships between pretreatment and posttreatment responses, were assessed in a population of 38 boars of similar age and breeding. Testosterone proopiomelanocortin Homo sapiens
2 Variation in ability of boars to produce testosterone and luteinizing hormone (LH) in response to both gonadotropin releasing hormone (GnRH) and adrenocorticotropic hormone (ACTH) stimulation, as well as quantitative relationships between pretreatment and posttreatment responses, were assessed in a population of 38 boars of similar age and breeding. Testosterone proopiomelanocortin Homo sapiens
3 Peripheral testosterone concentrations following either GnRH or ACTH increased (P less than 0.01) to peak circulating levels of 7.16 +/- 0.62 and 8.42 +/- 0.81 ng/ml by 120 and 45 min, respectively. Testosterone proopiomelanocortin Homo sapiens
4 Post-GnRH testosterone area varied from 7.44 to 50.84 ng/ml X h (CV = 47.44%) and post-ACTH testosterone area ranged from 3.05 to 28.78 ng/ml X h (CV = 46.09%). Testosterone proopiomelanocortin Homo sapiens
5 Significant (P less than 0.01) correlations were obtained between pre-GnRH and post-GnRH testosterone areas (r = 0.58) and between pre-ACTH and post-ACTH testosterone areas (r = 0.67). Testosterone proopiomelanocortin Homo sapiens
6 The testosterone producing ability of boars was highly variable and their innate ability to produce testosterone influenced their response to GnRH and ACTH. Testosterone proopiomelanocortin Homo sapiens
7 Additionally, the mechanisms by which GnRH and ACTH influence testosterone production in boars appear to differ. Testosterone proopiomelanocortin Homo sapiens