An investigation of the possible effects of subclinical iodine deficiency on ewe fertility and perinatal lamb mortality |
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Authors: | Sargison N D West D M Clark R G |
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Institution: | Department of Veterinary Clinical Sciences, Massey University, Palmerston North, New Zealand. |
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Abstract: | A controlled supplementation trial was performed in an assumed iodine-deficient Romney ewe flock in the Manawatu. Significantly more twin litters were born to iodine-supplemented ewes than to control ewes. Furthermore, the perinatal mortality rate in lambs born to iodine-supplemented dams was significantly lower than in lambs born to control dams. Ewe age and the use of different lambing paddocks for iodine-supplemented and control ewes may have been confounding factors. In both iodine-supplemented and control ewes, serum T3, and T4, concentration values remained above the currently used normal range throughout the trial period. |
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