Major crops affected: Corn Silage, High Moisture Corn, and Earlage/Snaplage
Conditions favoring production: Cool growing season resulting in late harvest. These conditions are unfavorable for bacteria species that are responsible for the fermentation and preservation of ensiled feeds.
Symptoms: Very little research is available on the effects of yeasts on animal performance. The most common result of high yeast counts is unstable silages that heat rapidly and subsequently grow additional mold. These unstable silages result in nutrient losses and can potentially reduce dry matter intakes.
High endemic yeast population is ensiled
During slow fermentations, moderate growth of yeast occurs until oxygen is expired in the silage.
At feedout, yeasts are re-exposed to oxygen
Yeast growth becomes exponential.
Lactic acid is consumed
Silage acids are volatilized.
Silage pH rises.
Molds with low oxygen requirements (Mucor) invade the silage.
|<10,000||120-140 hours||Typical values in a well-preserved feed|
|1,000,000||~ 40 hours|
|25-50,000,000||Upper range for inadequately fermented feed.