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Dairy Feeds and Drug Additives as Related to Cattle Efficiency and Public Health¹

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

An outstanding observation in recent years has been in the identification of a toxic gas, nitrogen dioxide, which may be produced in the early stages of silage-making. The real impetus toward the recognition of the seriousness of toxic effect of this gas in silage-making came in 1955, when farmers in different parts of the country were hospitalized due to a mysterious pulmonary illness that could not be related to any known disease. In all cases, the men became violently ill, with coughing and shortness of breath, after going into a silo soon after filling with either corn or legume forage. In some cases, irritating fumes and even a yellowish-brown gas were observed in the silo chute or above the silage at the time the men entered the silos. The first report on two such cases was made by Delaney et al. (3) in April, 1956. A careful and systematic study of the patients, and the report on the production of nitrogen dioxide in silos, led to the conclusion that the illnesses were similar to those caused by nitrogen dioxide poisoning.

¹ Report of the Public Health Committee of the American Dairy Science Association for 1958.