Managing Sub-Acute Ruminal Acidosis in High-Yielding Herds
Sub-acute ruminal acidosis (SARA) is one of the most under-diagnosed conditions in intensive dairy and beef systems. It rarely causes obvious illness, yet it steadily undermines rumen function, intake and profitability across the herd.
What drives SARA
Rations rich in rapidly fermentable carbohydrate — needed to fuel high yields — can push rumen pH below the healthy range for hours each day. Fibre that is too finely chopped, or sorting at the feed bunk, makes it worse.
The low-pH environment damages the rumen wall and disturbs the microbial population that a cow depends on to digest her feed.
The signs to watch
SARA is defined by its subtlety: fluctuating intake, loose manure, reduced milk-fat percentage and a rise in lameness and displaced abomasum some weeks later.
Because no single cow looks acutely sick, the cost is best read at herd level — in the gap between expected and actual performance.
A prevention-first strategy
Consistent ration formulation, adequate effective fibre and careful transition-cow management form the foundation. Buffers and rumen modifiers help stabilise pH through the day.
The goal is a steady rumen environment — the single most important asset a high-yielding ruminant has.
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