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Effect of feeding thyroactive iodocasein on growth, feathering, and weights of glands of young chicks

Effect of feeding thyroactive iodocasein on growth, feathering, and weights of glands of young chicks

Poultry Sci 22(5): 374-380

Thyroactive iodocasein with a potency 3.1% that of thyroxine, mixed in a basal mash at the level of 36 gms. per 100 pounds of mash, produced slightly heavier chicks at 12 weeks of age than the controls; when fed at lower levels, it did not produce weights different than the controls. At levels higher than 113 gms. of thyroactive iodocasein with a potency 2% that of thyroxine, per 100 lbs. of mash, growth was depressed and mortality increased as the level of thyroactive iodocasein increased. Feather growth in chicks improved as the level of thyroactive iodocasein added to the mash increased. Thyroactive iodocasein, when fed in the mash at levels of 4.5 to 227 gms. per 100 lbs., depressed the thyroid weight below that of the controls. The data presented indicate the following trends in gland weights of exptl. lots receiving thyroactive iodocasein as compared to control groups: (1) an increase in heart weight, (2) a slight decrease in pituitary wts. of [male][male], and (3) a decrease in gonad wts. of both sexes. Exptl. lots receiving thyroactive iodocasein and controls did not show significant differences in wts. of kidneys, liver, and adrenals except as previously noted in the case of the adrenals of the group receiving 227 gms. of thyroactive iodocasein per 100 lbs. mash. Thyroactive iodocasein of the potency used (2% and 3.1% of the potency of thyroxine) produced the most satisfactory results from the standpoint of both growth and feathering at levels of 113 and 36 gms. respectively per 100 lbs. of mash.

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Accession: 013362140

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DOI: 10.3382/ps.0220374

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