Methodology for assessing zinc bioavailability: efficacy estimates for zinc-methionine, zinc sulfate, andd zinc oxide

Article Abstract:

An assay system measuring the bioavailability of zinc in zinc methionine (ZnMET), zinc sulphate (ZNSO4) and zinc oxide (ZnO) was developed to assess zinc availability with respect to source. Supplementary zinc coming from the different compunds under evaluation was added to the diet of chicks. Analysis of the chicks' blood, liver, kidney, and tibia revealed that ZnMET has the highest zinc bioavailability and that ZnO has the lowest as compared to a ZnSO4 standard. The assay can be an effective tool in assessing the bioavailability of zinc from different sources.

Zinc, Zinc (Metal), Zinc compounds

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Passive immunization with antiserum to adrenocorticotropin increases weight gain in normal female rats

Article Abstract:

Selective ablation of adrenal steroid secretion was achieved by passively immunizing rats with sheep anti-adrenocorticotropin (ACTH) antibodies. The treatment was found to effectively reduce plasma corticosteroid levels over the short term. The stress response of treated rats showed that ACTH immunization resulted in escape from suppression after a few hours. In longer term studies, ACTH immunization resulted in increased weight gain. The implications of this latter finding on other domestic animals are still unclear.

Growth, Immunization, Adrenal glands, ACTH, Corticotropin

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Bioavailability of threonine in soybean meal for rats and chicks

Article Abstract:

The availability of soy bean meal threonine for use of rats and chicks was assessed by providing the test animals with threonine-supplemented diets. The resulting growth rate was interpreted as a measure of feed conversion and bioavailability of threonine. Results indicated that threonine in soybean meal has 91% bioavailability for rats and 103% for chicks as compared to crystalline L-threonine. Supplementing the diet with other amino acids did not influence the bioavailability of threonine.

Food and nutrition, Threonine, Chicks, Chicks (Infant chickens), Soybean meal, Soybean cake and meal

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