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CURRENT interest in the inclusion of ascorbic acid in laying rations was stimulated by the report of Thornton and Moreng (1958) that dietary ascorbic acid reduced the decline of egg shell quality experienced under high environmental temperatures. The earlier negative results of Heywang and Kemmerer (1955) might be explained by their higher (20 times) level of ascorbic acid supplementation. That high environmental temperature is detrimental to egg shell quality has been demonstrated frequently (Bennion and Warren, 1933; Warren and Schnepel, 1940; Wilhelm, 1940; and others). Why this is so has not been clearly indicated. Conrad (1939) and later Mueller (1959), demonstrated that high temperatures depressed serum calcium but Mueller also found a negative correlation between egg shell thickness and serum calcium level. Thornton and Moreng (1959) believe thyroid function is depressed by high temperatures and stimulated by ascorbic acid as they observed that oxygen consumption increased and egg shell quality …
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Hunt et al. (1962) studied this question.
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