The incidence of precipitins to Micropolyspora faeni in cattle fed hay treated with an additive to suppress bacterial and mould growth

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Abstract
The development of precipitins to Micropolyspora faeni in cattle fed hay treated with a bacterial and mould inhibitor is compared to that in herds fed untreated hay. The results indicate that, even when fed only treated hay, exposure to M. faeni was such that a considerable proportion of precipitin-free cattle did develop precipitins.