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The Metabolism of the Lactogenic Hormone¹

Department of Dairy Husbandry, University of Missouri, Columbia

ABSTRACT

1. Cow manure free from urine and extraneous materials was collected and dried in an electrical drying oven at a temperature of about 45° C. for about 48 hours.
   
2. Forty per cent aqueous alkaline ethyl alcohol extracts of individual samples of lactating cow and bull manure were precipitated by increasing the alcohol concentration to 75 per cent at pH 5.7 under cold conditions.
   
3. The average yield of lactogenic hormone from one kilogram dry manure ranged from 0.29 to 1.25 international units for the high milk producers, from 0.23 to 0.3 international units for the low milk producers, and from 0.17 to 0.19 international units for the bulls.
   
4. It was concluded that there might be a relationship between the amount of lactogenic hormone excretion into the digestive tract and the milk producing ability.
   
5. Possibly lactogenic hormone is secreted into the digestive tract, but only that part which is excreted in the lower portion of the intestine is excreted together with the feces in an active form.
   

¹ Contribution from the Department of Dairy Husbandry, Missouri Agricultural Experiment Station, Journal Series No. 1156.