Bibliographic Citation
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Title | EFFECT OF I$sup 131$ ON REPRODUCTIVE PERFORMANCE IN EWES |
Creator/Author | Ragan, H.A. ; Clarke, W.J. ; McClellan, R.O. ; Horstman, V.G. ; Bustad, L.K. |
Publication Date | 1963 Dec 01 |
OSTI Identifier | OSTI ID: 4104657 |
Other Number(s) | CODEN: HLTPA; 0017-9078 |
Resource Type | Journal Article |
Resource Relation | Health Physics (England); Vol: 9 |
Research Org | General Electric Co., Richland, Wash. |
Subject | BIOLOGY AND MEDICINE; AGE; ANIMALS; BLOOD SERUM; DISEASES; EMBRYOS; GONADS; IODINE COMPOUNDS; IODINE 131; ORGANIC IODINE COMPOUNDS; PHYSIOLOGY; PREGNANCY; PROTEINS; QUANTITATIVE ANALYSIS; QUANTITY RATIO; RADIATION DOSES; RADIATION EFFECTS; REPRODUCTION; SEX; SHEEP; SURVIVAL TIME; THYROID; VARIATIONS; WEIGHT |
Description/Abstract | The reproductive performance of seventeen ewes fed single doses of 3 mC I/sup 131/ 4-5 years ago was evaluated. The performance of the hypothyroid animals was compared with that of a group of euthyroid ewes of the same age kept under identical conditions. The estrus cycles, times in estrus during a 60-day period, and gestation periods of the hypothyroid ewes were not significantly different from those of the controls; however, there was greater variation within the hypothyroid group. The serum proteinbound iodine (PBI) values, determined prior to breeding and at intervals throughout and following the gestation period, indicated a slight rise at 50-100 days of pregnancy in both the experimental and control group. All of the control ewes (six/six) conceived after the first mating. Three of seventeen hypothyroid ewes failed to conceive or experienced early embxyonic death, two of these three ewes manifested signs of estrus at regular intervals. Thyroid uptake of an I/sup 131/ tracer dose in the hypothyroid ewes ranged from 5.6-20% in those that were pregnant and 3-11% in those that were not pregnant. The two ewes with the lowest thyroid I/sup 131/ tracer uptake (5.6 and 6%) died during the course of pregnancy. There were no cases of spontaneous abortion or still births in either the hypo- or euthyroid groups. The lambs from the hypothyroid group did not gain weight as rapidly during the first month of life and their PBI values at birth were lower than those of the control lambs. (auth) |
Language | English |
Format | Pages: 1343-7 |
System Entry Date | 2001 Jun 03 |
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