Effect of Iodinated Casein and Thiouracil on the Performance of Laying Birds

Thyroprotein and Fat in Laying Diets

“…Under the conditions of these experiments, thyroprotein did not possess any nutritional significance in laying diets from the standpoint of egg production. Our results confirm the findings of Hutt and Gowe (1948), Hoffmann and Wheeler (1948), Godfrey (1949) and Berg and Bearse (1951). The effectiveness of dietary fat in maintaining body weight and improving feed efficiency was demonstrated.…”

“…Administration of thyroprotein and dianisylhexene in combination was equally effective as administration of thyroprotein alone. Berg and Bearse (1951) reported a highly significant decrease in egg production and lowered body weights of White Leghorn pullets fed 15 grams of thyroprotein per 100 pounds of feed.…”

Influence of Thiouracil on Chickens Selected for High and Low Body Weights

“…The depression of body weight of birds receiving the ration containing thiouracil reported in this study was not consistent with the findings presented by Mixner et al (1944) and Berg and Bearse (1951). In their experiments, however, the birds were much older when thiouracil feeding was initiated than were our birds.…”

The Microscopic Structure of the Egg Shell Matrix As Influenced by Shell Thickness and Environmental Temperature

“…Others, Asmundson and Pinsky (1935), Gutteridge and Novikoff (1947), Hoffman and Wheeler (1948), and Berg and Bearse (1951) have made similar observations. Recently, Stahl and Turner (1961) determined the thyroxine secretion rate in high and low thyroxine secreting lines of chickens and found that the metabolic rate and environmental temperature varied inversely with certain genetic strains being more resistant to change.…”