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Studies on the thyroid gland of cattle : thesis submitted / by no. 391 [M.G. Hollard] for the Animal Husbandry section of the M. Agr. Sc. examination

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(1)

Copyright is owned by the Author of the thesis. Permission is given for a copy to be downloaded by an individual for the purpose of research and private study only. The thesis may not be reproduced elsewhere without the permission of the Author.

(2)

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'I'hesi s Subr.d tted by No. 391 for the Animal F.u sbc:::.r:dry Section of the M.Agr.Sc. Examination, 1946

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INTf0DUCTIJN

MH.TJMY J.i THt; TJYhOID GLJ-J:D Review of Li ter.:. tlJ re

Genersl �natomy of the Thyroid Gl��d

The reight of the Thyroid Glcnd in C�ttle

t1r;;thods Results

f�v�e� o� Liter�tcre

feL.tior :Jf Ioc.irc to L:e T>::roid Glu:d Regulc:. ti or� of Th�·roi d ,.c ti v l t.�

}�ysiolo�icLlly Active Iodi��tod Proteins

(a) Discove:ri

(b) PhJ.r3i ologi cc.:.l Effects of J,rti fi d::..l

Psge

1 4

4 5

8

9

1 5

1 5 1 �)

17

17

Th:'roproteins 18

ExJerimentc.:.l 20

Potency of Thyro�r�tcin 21

General and Histological Technique 25

.Measurement of the Height of t�e Epi theli<::l Cells 29

Effects of Thyroprotein

(a) General Effects

�b) I Effects on Acina- Cel l Height and Thyroid Gland ·Weight

38 38

(4)

Review of Literature on Goitrogeric Subst�nces Natu r� of Goitrogenic SubstE.nces

Mode of Action of GoitrogEnic Subst&rces To:xic Effect of GGitrogenic Substc_r_ces Ex;:erirnen tc..l

DISCLJ-:)0101�

Effects of Thioure� or D�iry Co�s

(b) c��erLl Effect�

le) F�frct on Ac5nar Cell ?eigtt ��d Th:/roid ':',·eicht

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