By Raymond C. Loehr
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Additional resources for Agricultural Waste Management: Problems, Processes and Approaches
Estimates indicate that it will rise from 344 million people in 1950 to 500 million in 1985. While farming will still be the principal source of employment in the developing countries, the relative importance of farming will decrease. The decline in the agricultural labor force will continue as countries develop but the rate in the developed countries will decrease. There is a limited movement of new labor into agricultural industries which results in a higher average age. Greater productivity will be required to maintain economic success in agriculture.
Specialization has removed cattle from pasture and grass land and has resulted in confinement of large numbers in small areas with an average density of one animal per 50 to 150 ft . The number of cattle on feed for slaughter was over 13 million head in 1970, an increase of 73% in the previous decade. During this period, the number of cattle on feed in the United States increased at the rate of over one-half million head per year. Since midcentury, commercial feedlot operations in which feed and water are brought to the animals in confined areas have been expanding rapidly.
U . S . D e p a r t m e n t of Agriculture a n d the Office of Science a n d Tech nology, W a s h i n g t o n , D . C . , 1969. 6. C o m m i t t e e on Public W o r k s , U . S . H o u s e of Representatives, " L a w s of the U n i t e d States Relating to W a t e r Pollution C o n t r o l a n d E n v i r o n m e n t a l Q u a l i t y . " G P O , W a s h i n g t o n , D . C . , 1970. 7. G r a y , M . , O n e state's a p p r o a c h to the p r o b l e m of pollution from feedlot wastes. 42nd Annu.