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Variation of Plasma Testosterone in Developing Friesian Bulls¹

University of Pisa, Pisa, Italy and Scuola Normale Superiore, Pisa, Italy

Abstract

The pattern of plasma testosterone was observed during the first 14 months of age in a group of Friesian bull calves reared for meat production. Testosterone was determined by radioimmunoassay in samples collected fortnightly and the data were analyzed by use of polynomial regression and Fourier's transform. Testosterone increased gradually between 4 and 5.5 months, during the period of puberty. After 6.5 months of age plasma testostestone oscillated between about 200 and 400 ng/100 ml at intervals of about 2.5 months.

¹ This investigation has been effected at "Centro Studi e Sperimentazione Agraria" of Pisa University and has been supported by the Grant no. 73.005.04/115.1130 from the "Consiglio Nazionale delle Ricerche", Roma.

² Institute of Animal Husbandry, Via del Borghetto 80—56100 Pisa.

³ Institute of Mathematics, Scuola Normale Superiore, Piazza dei Cavalieri 7—56100 Pisa.

⁴ Institute of Anatomy and Physiology of Domestic Animals, Via Matteotti—56100 Pisa.

⁵ Fellow of C.N.R., (Roma)—Endocrine Laboratory Institute of 1st Medical Clinic—56100 Pisa.

⁶ The authors gratefully acknowledge the help of Mr. G. Gagliardi, R. Santoni and G. Turriani for their technical assistance.

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