Abstract
GROWTH hormone has been shown to have a growth stimulating effect on mature rats and dogs by Evans and Long (1921); Putnam, Benedict and Tell (1929); Li and Evans (1944); Li and Evans (1948); Gaebler (1951). Very little work has been reported on the effects of growth hormone in poultry. Hulbé (1949) injected dwarf chicks daily with an extract of fresh beef pituitaries for a period of 6 months, in monthly increasing doses of 70–230 rat units. The injected birds showed a more prolonged increase in weight than the controls. Hsieh, Wang and Blumenthal (1952) found that growth hormone exerted a diabetogenic and growth-promoting action when injected into the developing chick embryo. No published reports could be found which describe the effects of purified growth hormone in laying hens.The purpose of this paper is to report the effects of injecting low levels of growth hormone in pullets and …
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