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Increased Milk and Milk Fat Production Following the Feeding of Artificially Formed Thyroprotein (Thyrolactin)¹

Missouri Agricultural Experiment Station, Columbia

ABSTRACT

1. Optimally iodinated milk proteins (thyrolactin) were fed to lactating goats and cows and its effect on milk production was noted.
   
2. When fed to goats in declining stages of lactation at the rate of 5 to 10 grams daily, thyrolactin stimulated increases in milk production ranging from 0.8 to 40.8 per cent and averaging 10.51 per cent. The heart rate was accelerated an average of 8.2 beats per minute.
   
3. Thyrolactin fed in amounts of 50 to 100 grams daily to nine cows in a total of 14 individual trials caused an average increase in milk yield of 8.59 per cent. The individual increases ranged from 6.09 to 22.6 per cent. In six trials in which milk fat analyses were made there was an average increase of 6.77 per cent in fat percentage and 13.9 per cent in fat yield.
   
4. The results are discussed in relation to previous work that has been done on the effect of thyroid feeding and thyroxine injection, and the practical possibilities are pointed out.
   

¹ Contribution from the Department of Dairy Husbandry, Missouri Agricultural Experiment Station Journal Series No. 805.