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PubMed1977

[Effect of thyroxine and insulin on nitrogen metabolism in the gastrointestinal system and mammary glands of lactating cows].

In 9 cows giving 6-10 kg of milk daily and fed with 4 kg of combined food, administration of 50 mg of thyroxin increased extraction of some serum proteins from the blood by the digestive system (alpha- and beta-globulin factions in particular). Apsorption of amino-nitrogen from the blood by the mammary gland was increased by 3.5 times, and of ammonia by 5 times. Excretion of urine into the blood displayed a three-fold increase. Insulin in dosage 1 unit per 1 kg of body weight increased excretion of serum proteins and urine from the digestive system into the blood. Excretion of gamma-globulins into the lactic vein's blood increased by 3 times, and 0.17% of albumins were exctracted by the mammary gland from the coming blood. Subcutaneous administration of thyroxin and insulin obviously increases the amount of protein, casein and nitrogen substances in the milk.

Ammonia↗