LIVESTOCK IMPROVEMENT IN RELATION TO HEREDITY AND ENVIRONMENT LIVESTOCK BY J. E. NICHOLS PREFACE FORMAL genetics does not always provide a satisfactory or convenient approach to an understanding1 of the principles involved in questions of livestock improvement and selection. The breeder finds it too remote at many stages from practical applications and bearings for the agricultural and veterinary student it usually follows too detached a route. The approach made here represents an attempt to outline the principles and to indicate how the genetic and environmental concepts are interwoven in the idea of stock improvement. The stimulus to make this attempt springs from discussions with my former colleagues and senior students in Western Australia, and with a great number of stockbreeders in many countries. If the topics of environment are surveyed in this book hTa predominantly ecological light, it is because my contacts with livestock industries have ranged widely my associations with...

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