Cattle urea

• Nutritional additive for ruminants composed by Nitrogen (46%).
• TOXICITY THRESHOLDS in animals: 40 to 50 grams per 100 kg of live weight per animal per day.
• Due to its hygroscopic nature, the product is moistened in contact with air.

For each of the species and categories for which the product is intended (expressed in the appropriate units), both for additives and for pre-blends:
Replace one third (1/3) of the total protein:

• Make up 3 % of the dry matter (DM) of the concentrate or 1 % of the total DM of the ration;
• Or supply 0.03% of the live weight, always with ground cereal grain, at a minimum rate of 0.5% of the live weight of grain.
• An excess in the daily dose can produce ammonia toxicity

The supply of granulated urea as an additive is intended to generate microbial protein.
The synthesis of microbial protein in the rumen requires the timely availability of adequate sources of N and carbohydrates for rapid bacterial growth.
The consequence of an asynchronism in the digestion of N and energy sources is an increase in the absorption of rumen ammonia into the bloodstream and conversion to urea in the liver.
From the liver one part of UREA passes through the kidney and exits in the urine, and the other part of UREA, returns to the rumen through the saliva.

Levels of urea in “milk”.
With a well-balanced diet in protein (degradable and non-degradable), milk urea levels should never be higher than 300 mg per liter of milk.
(or 30 mg/dl)
Optimal: 150 – 300 mg/liter (or 15 to 30 mg/dl) (OPTIMAL Energy-Protein ratio)
Degradable protein deficit: less than 150 mg/liter (or less than 15 mg/dl)
Excess degradable protein: greater than 300 mg/liter (or greater than 30 mg/dl) (indicates NO ENERGY)
Dairy cows with high concentrations of urea in their blood show a reduction in calving rates.
Baker et al.
(1995) indicates that values above 19 mg UREA/dl milk urea N content are considered critical for reproduction.

• An excess in the daily dose can produce ammonia toxicity
• Given the variability of diets and nutritional approaches, we recommend adjusting the use to the technical indications of the Veterinary Advisor or Agricultural Engineer.