EFFECT OF YEAST EXTRACT AND OTHER SUPPLEMENTS ON THE GROWTH OF CHICKS FED SIMPLIFIED DIETS
1940; Elsevier BV; Volume: 133; Issue: 2 Linguagem: Inglês
10.1016/s0021-9258(18)73346-2
ISSN1083-351X
Autores Tópico(s)Biotin and Related Studies
ResumoVitamin Be deficiency in chicks was produced' by use of a simplified diet containing a phosphotungstic acid filtrate of yeast extract as a source of pantothenic acid.It was subsequently observed that such a diet, even when supplemented with vitamin Ba, was deficient for chicks, depending on the degree of purification of the pantothenic acid preparation.Such a diet was used in this investigation.A slight but definite stimulation of growth was produced by choline in two experiments.Marked stimulation of growth was produced by a crude solution prepared by extracting yeast with 50 per cent ethanol, but a separate experiment showed that the growth-promoting factor was absent from the yeast phosphotungstic acid filtrate.Nicotinic acid produced no additional growth.Basal Diet I consisted of glucose (cerelose) 55 gm., sardine meal (fat-extracted) 20, lard 5, gelatin 5, washed casein 5, lactose 5, fortified sardine oil (3000-A, 400-D) 0.3, ground limestone 1, iodized saIt 0.5, bone ash 0.3, KHzPOl 0.2, MgSOd 0.15, ferric citrate 0.1, MnSO* 0.1, ZnO 3 mg., CuC03 3 mg., thiamine2 0.4 mg., riboflavin2 0.6 mg., vitamin Bs2 0.3 mg., alfalfa hexane extract equivalent to 1 gm. of alfalfa meal, and yeast phosphotungstic acid filtrate containing 2 mg. of pantothenic acid as measured by biological assay with chicks.3Vitamins A and E were fed separately.Eight chicks were placed on each diet at hatching.In a simultaneous experiment, chicks from the same hatch as in the preceding experiment were fed Diet II consisting of ground polished rice 67.5 gm., washed sardine meal4 24, salt mixture' 1
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