. Biochemistry of plants and animals, an introduction. Biochemistry. FEEDS 421 HORMONES Recently there has been much interest in the use of synthetic sex hormones in fattening poultry and beef cattle. Diethylstilbestrol (page 323) has been used successfully for such purposes. Tablets of the hormone implanted in the head of the animal or added to the ration lead to increased gain in weight and increased feed efficiency. Such implantation or addition to the ration must be controlled, or undesirable side effects such as elevated tails, sagging loins, and mam- mary gland development may occur. Imp
. Biochemistry of plants and animals, an introduction. Biochemistry. FEEDS 421 HORMONES Recently there has been much interest in the use of synthetic sex hormones in fattening poultry and beef cattle. Diethylstilbestrol (page 323) has been used successfully for such purposes. Tablets of the hormone implanted in the head of the animal or added to the ration lead to increased gain in weight and increased feed efficiency. Such implantation or addition to the ration must be controlled, or undesirable side effects such as elevated tails, sagging loins, and mam- mary gland development may occur. Implantation of diethylstilbes- trol in the heads of cockerels several weeks before slaughter has a feminizing effect and produces a fatter, tenderer carcass. Addition of the hormone to the ration of poultry is not nearly as effective as with beef cattle. Thyroprotein supplements have also produced added gains in beef cattle. There is evidence that many plants contain compounds with es- trogenic properties. A part of the beneficial effect of young pastures on milk production may be due to such hormone-like chemicals. Genistein, a 5,7,4^-trihydroxyisoflavone, has been isolated from sub- terranean clover in quantities of 2 mg. of the hormone per 100 g. of fresh clover. The activity per unit weight is very low compared with that of estrone, but the high content in subterranean clover makes. OH HO. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mallette, M. Frank (Manney Frank), 1917-. New York, Wiley
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