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Avoiding the Fall Slump


Abruptly switching from old corn silage to fresh can cause a production slump

Dairy cows commonly fail to reach their full production potential during the fall. This is often caused by an abrupt change from old corn silage to freshly cut forage or recently fermented corn silage.

“A slump in production can be costly for a farm and frustrating for producers,” says Renato Schmidt, Ph.D., Technical Services – Forage, Lallemand Animal Nutrition. “We often see otherwise unexplained decreases in milk production or an inability to reach production targets in the fall as producers switch from old silage to new material. This slump can also affect herd health with signs such as a decreased feed intake or loose manure.”

Contributing factors to a fall slump may include:

  • Lower starch digestibility in fresh silage or forage. When harvested above 35% dry matter (DM), the starch in corn starts to become less digestible. Flint varieties also have lower starch digestibility than floury ones.
  • High levels of fermentable sugars. Fresh forages can contain high levels of fermentable sugars, which can contribute to Sub-Acute Rumen Acidosis (SARA) in a herd.
  • Differences in DM and nutrient content. Silages normally present a different composition from one silo to the next, and from one year to the next.

To avoid a fall slump, Dr. Schmidt recommends four strategies:

  1. Ideally allow silage to ensile for at least four months before feeding. As silage spends additional weeks in storage, the starch becomes more digestible.
  2. Change silos gradually over a two-week period.
  3. Test new forages for DM and nutrient content. If necessary, the ration should be adjusted to reflect the changing composition.
  4. Use a proven silage inoculant containing enzymes to help break down plant fiber and thus aid in fiber digestibility. Biotal Plus II, Biotal Buchneri 40788, and Biotal Buchneri 500 inoculants contain a high activity enzyme formulation to increase fiber digestibility.

Thinking ahead to next year, Dr. Schmidt recommends considering an inoculant that will help maintain feed quality. The strain Lactobacillus buchneri 40788 is the only active bacteria reviewed by the FDA in preventing heating and spoilage – two factors that can greatly affect silage quality. Biotal Buchneri 500 combines the fermentation benefits of Biotal Plus II with L. buchneri 40788 to provide optimum forage preservation.

“Planning ahead and making gradual changes in feeding can help keep milk production steady and maintain cattle health,” Dr. Schmidt says. “Ultimately, it helps keep profits steady for the farm.”

LallemandLallemand Animal Nutrition is dedicated to the development, production, and marketing of profitable, natural and differentiated solutions for animal nutrition and health. Our core products are live bacteria for direct fed microbials and silage inoculants, specific yeast for probiotics, and high value yeast derivatives. More news from Lallemand Animal Nutrition can be seen on www.lallemandanimalnutrition.com.


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