References
- National Academy of Sciences . 1968 . “ National Research Council ” . In Nutrient Requirements of Domestic Animals—Swine , 6th ed. 19 – 19 .
- National Academy of Sciences . 1969 . The Use of Drugs in Animal Feeds , : 3 – 30 .
- Agricultural Research Council . 1967 . The Nutrient Requirements of Farm Livestock, No. 3, Pigs, Technical Reviews and Summaries , : 194 – 194 .