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Big round bale silage is an important feed source for dairy cattle in the Western Cape. Oats is often ensiled in big round bales. The quality of silage depends on the quality of the crop at ensiling, type of fermentation, rate of pH decrease, moisture content of the crop and anaerobic conditions. The rate of pH drop is determined by the level of water-soluble carbohydrates and the epiphytic bacteria present on the crop prior to ensiling. If insufficient lactic acid bacteria are present on the crop at ensiling this will result in a slow drop in pH. The pH should drop rapidly below 5 to prevent the growth of Clostridium tyributyricum. These are anaerobic bacteria that break down protein and produce butyric acid. This will lower the palatability and intake of silage. Anaerobic conditions are reached within 24 hours after bales are wrapped. Compaction in the big round bale is very important to limit infiltration of air into the bale. The use of a lactic acid bacterial inoculant may improve the fermentation of silage and animal production. In this study the effect of adding an inoculant (Sil-all) to big bale oat silage on intake, milk production and milk composition of Jersey cows was determined.

The effect of adding a lactic acid bacterial inoculant to big round-bale oat silage on intake, milk production and milk composition of Jersey cows