We recommend 72 h as the time to read tests using bovine PPD in order to obtain maximum efficien- cy by detecting tuberculous cattle and eliminating non-specific reactors. Because the maximum dif- ference between the responses to bovine PPD and avian PPD occurs at 72 h this is also the optimum time to read a comparative test.

There was no correlation in these experiments between the presence of macroscopic lesions, the sensitivity to bovine PPD and recovery of mycobacteria from the inoculation site 11 weeks after infection.

Acknowledgments

We thank Mrs J . A. Duffett, Mr M. J . Duffett and Mr M. Pope for their conscientious technical assistance, Mr A. Rowlatt for histological preparations, and Dr A. Trajstman and Mrs V. Lord for the statistical analysis.

We are grateful to Dr T. M . Alexander of the

Tasmanian Department of Agriculture and Dr D. M. Helwig of the Animal Industry and Agriculture Branch, Department of the Northern Territory, for some of the original mycobacterial isolates.

We are also indebted to both Dr E. Mackay- Scollay of the Perth Medical Centre, and the Na- tional Jewish Hospital and Research Centre, Denver, Colorado, for sero-typing the isolates.

References Green, H. H. (1946)- Vef. J . 102: 267. Lepper, A. W . D., Newton-Tabrett, D. A , , Corner, L. A, ,

Carpenter, M. T., Scanlan, W. A., Williams, 0. J. and Helwig, D. M. (1977)-Auust. ver. J. 53: 208.

Pearson, Catherine W., Corner, L . A. and Lepper, A. W. D. (1977) Aust. vet. J . 53: 67.

Ritchie, J . N. (1953).-ln “Advances in the Control of Zoonoses”. F A 0 agric. Stud., No. 25, FAO, Rome, p. 2 5 .

Waddington, F. G . (1967)-FAO Expanded Program of Technical Assistance Report No. 201 I , Part 11.

(Received for publicarion 26 August 1977)

BOOK REVIEW

SWINE PRODUCTION IN TEMPERATE AND TROPICAL ENVIRONMENTS

This book* is a general reference covering the technical aspects of swine production. The authors introduce the subject with a brief history of the pig, and information on the value of pork as a source of food for man. They then deal with the various aspects of swine production: breeding and selection, growth and development, reproduction and lactation. nutrition and sources of feeds, diseases, metabolic and nutritional disorders, toxic substances, environmental physiology, and management and marketing.

The amount of technical information presented is con- siderable and is based on extensive use of the literature up to the year of publication. The author’s style presents this in- formation in an interesting and clear manner, wlell supported with illustrations and tables of experimental data.

~~ ’ “Swine Production !n Temperate and Tropical Enb~ronment,”. W. G . Pond and I H . Mancr. U . H Frecman& Co.. San trancisco. 1973 Pp. 6-46, USS17.50.

Being a nutritionist, the sections dealing with feeds and feeding were of most interest to me. There is an excellent description of the various sources of feeds used for pigs in both temperate and tropical environments. The composition of the feed, methods of processing, and presence of toxic factors, are all discussed in considerable detail. An appendix has tables of the composition of commonly used swine feeds; based on those prepared by E. W. Crompton and L. E. Harris, and are reprinted from Nutrient Requirements of Swine, 6th edn, Publication 1599. National Academy of Sciences, Washington, DC, 1968.

This book should be of value as a general reference for all associated with pig production - to veterinarians associated with pig diseases and management, students and research workers, nutritionists. pig production advisory officers, and to pig producers interested in the technical basis of swine produc- tion.

E. S. Barterham

286 Australian Veterinary Journa l , Vol. 54. June, 1978