[Effect of thyroxine and insulin on nitrogen metabolism in the gastrointestinal system and mammary glands of lactating cows]. / Deistvie tiroksina i insulina na azotistyi metabolizm v pishchevaritel'noi sisteme i molochnoi zheleze u laktiruiushchikh korov.

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.