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In the male pig the values varied from 0.94 to 1.61 µg per 100 ml plasma and were 7 and 11 times higher, respectively, than in castrated and female animals. Values increased with age. The concentration measured in a bull was 0.59 µg per 100 ml plasma.

Hoffmann, B.; Claus, R.; Karg, H.
Acta Endocrinologica, 1970, 64, pp 377-384