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Publication type: Diploma Thesis

Year: 2011

Author(s): Dallmeyer, PV; Weyerer, CJ

Title: Fütterungsstudie zur Phytohormonellen Kastration beim Hahn mittels Vitex agnus castus (Mönchspfeffer).

Other title: Feeding study for the purpose of phytohormonal castration with Vitex agnus castus (Monk`s Pepper)

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 76.


Franz Chlodwig
Hahn-Ramssl Isabella

Möstl Erich

Vetmed Research Units:
Institute of Animal Nutrition and Functional Plant Compounds

Graduation date: 18.10.11

Vitex agnus castus (Monk´s Pepper) belongs to the family of the Lamiaceae and contains phytoestrogens. Its pharmacologically active substances are flavonoids (casticin) and iridoids (agnusid and aucubin). The clinical trial of the phytohormonal castration was accomplished to examine the development of the primary and secondary sexual characteristics of cocks, the concentration of androgen metabolites in blood and faeces and the meat quality under influence of feed containing Vitex. In the course of this study the cocks were randomly distributed to an examination group and a control group, each with 30 animals and were nurtured over 22 weeks beginning the first day post natum. The examination group was fed with a dry extract of Vitex added to the normal feed. The control group was fed exclusively with the basic feed. The following parameters were examinated in the course of the clinical trial: body weight, feed conversion ratio, concentration of testosterone and androstenedione in serum, concentration of testosterone and 17-oxo- und 17ß-hydroxy-androstane in faeces, combs (length, height, colour, weight and lesions), length of spur, jowls (length, height and weight), testes (length, breadth and weight) and meat quality (weight, drip loss, cooking loss, pH-value and shear force). The body weight developed significantly different in the two groups and at the end of the study a cock of the examination group outweighted a cock of the control group. According to the comb lesions there was a significant difference detectable only on a singular examination day. The blood tests showed only in the development analysis of the androstenedione-values a significant difference. In this connection higher values in the control group were found. The calculation of the feed conversion ratio and the analysis of the dropping-values (androstane and testosterone) showed heavy fluctuations. The examinations of the other parameters showed no significant differences. In summary there was only in singular parameters (body weight, comb lesions and androstenedione in blood) a significant difference detectable.

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