Acidosis affecting estrus

Acidosis affecting estrus

Acidosis affecting estrus in dairy cows

In line with the strict order of the esteemed management of the company, Mr. Mokhtarian, and together with the Livestock Production Improvement Organization affiliated to the Jihad Agricultural Organization of Isfahan Province, the online media training unit of the cooperative intends to explain the factors affecting dairy cow estrus in several scientific articles.
In this article, we want to investigate the effect of acidosis on estrous uptake in dairy cows.
Rumen acidosis is a ruminant eating disorder that is usually caused by eating large amounts of easily fermented carbohydrate-rich foods, especially when the animals are not gradually accustomed to them.



Subacute Ruminal Acidosis (SARA) is defined as a period of decrease in ruminal pH associated with estrus, lameness, and other production-related health problems.

Analysis of the cause of acidosis

Misconception During ruminal acidosis, very high levels of dilactate are produced, which are slowly absorbed from the rumen. Also, its metabolism by ruminal tissues is very slow compared to Lactate.
The correct belief in acidosis leads to a systemic invasion of bacteria responsible for liver abscesses, including Sphaerophorus necrophorus and Coninobacterium pyrogenes, and causes damage to the livestock’s digestive tract, which is acidic.
Inflammation of the lower intestine results in diarrhea, which results in excessive loss of bicarbonate ions, which helps improve systemic acidosis.
Acidosis also increases the production of the microbial thiaminease, which results in the loss of thiamine, which increases the risk of the animal becoming infected with Phalamenacia polycythemia.
:Important note


Dilactate is absorbed from the rumen and its metabolic rate in tissues is similar to that of L-lactate.
In ruminal acidosis, the production of ethanol by bacteria and yeast is increased, and as a result of the absorption of large amounts of ethanol into the bloodstream, acidotic animals exhibit abnormal behavior.

Rumen acidosis, an eating disorder

Rumen acidosis is a ruminant eating disorder that is usually caused by eating large amounts of easily fermented carbohydrate-rich foods, especially when the animals are not gradually accustomed to them.

When acidosis occurs

  1. Rumen pH drops below 6.5. Acid is produced when ruminal microbes ferment food. If this acid is trapped, the pH of the rumen is lowered and germs are prevented from growing.
  2. At low rumen pH, the concentration of hydrogen ions outside the body of rumen microbes increases, and hydrogen ions penetrate the microbes, in which case the microbes must expend more energy to release hydrogen ions to maintain the normal pH inside their cells.
  3. This process results in less energy for the microbes to grow. The microbes that ferment the fiber are most affected.
  4. In this case, reduced feed intake, fiber digestibility is reduced, and microbial protein production is limited due to ruminal acidosis.
  5. In these conditions, the cows have diarrhea and are lethargic and drowsy.

Impact of diet

The diets of high-grain dairy cows (grains) and fermentable carbohydrates increase milk production, which in turn increases the risk of subacute acidosis.

Clinical signs of acidosis

  1. Acidosis affecting estrus in dairy cows
  2. Reduce milk fat to less than 3%
  3. Reduce milk protein to less than 3%
  4. Changes in food consumption,
  5. Emergence of leg ulcers and lameness,
  6. Decreased chewing and rumination (less than 50% of cows that lie down chew),
  7. Reduce milk production by more than 4.5 kg compared to what the ration should provide,
  8. Stools ranging from hard to diarrhea in similar food groups,
  9. The presence of mucin and fibrin in the stool,
  10. The presence of long fibers (larger than 1.2 cm) in the stool,
  11. Presence of undigested and crushed grains (more than 0.6 cm) in the feces
  12. Decreased feed efficiency relative to age and lactation days.

Did you know that cows with high densities in freestyle experience acidosis?

اسیدوز موثر بر فحلی
اسیدوز موثر بر فحلی

Excessive crowding of free stalls and feed manifolds lowers the pH of the rumen. This phenomenon dramatically reduces ruminal function and affects how the animal responds to the diet.

Golden Information Abstract

  1. The amount of dry matter in the feed is a determining factor in the pH of the rumen.
  2. Increasing the number of feedings may reduce ruminal pH fluctuations through manual feeding.
  3. The prevalence of ruminal acidosis in dairy herds is probably about the same as in fattening cows.
  4. It is not only the amount of starch and sugar in the diet that affects ruminal acid levels; The type of starch and its process are also involved
  5. Providing soluble and degradable protein in the rumen with starch can help increase microbial protein production and reduce rumen acid formation.
  6. The inclusion of High-Lipid By-product Pellets (HLBP) and its replacement by barley grain and rapeseed meal reduces the severity of ruminal acidosis compared to conventionally fed cows.
  7. To prevent acidosis, it is necessary for the animal to gradually become accustomed to diets high in fast-fermenting carbohydrates, as well as to limit its consumption by the animal.


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