1. Arnaud, M. J., Clement, C., Getaz, F., Schönegge, R., Blum, J. & Giese, W. (in press). Journal of Dairy Research.
2. Giese, W.1, Molnar, S.2 & Lingens, K.2 (1987). 1School of Veterinary Medicine, Hannover and 2University of Göttingen, unpublished data.
3. Giese, W., Martens, H., Breves, G., Gäbel G. & Michailowski, T. (1987). School of Veterinary Medicine, Hannover, unpublished data.