Document Detail

The effects of iodine deficiency on ewe fertility and perinatal lamb mortality.
MedLine Citation:
PMID:  16032020     Owner:  NLM     Status:  PubMed-not-MEDLINE    
AIMS: To substantiate a previous report of improved fertility and perinatal lamb mortality rate following iodine supplementation in a Manawatu Romney ewe flock. To contribute data which might be used to predict a response to iodine supplementation. METHODS: A controlled iodine supplementation trial was performed over 2 successive years. The possible confounding factor of different lambing paddocks on perinatal lamb mortality was removed by the reversal of the paddocks used by the supplemented and control ewes during the second year. RESULTS: During 2 successive years, iodine supplementation resulted in improved reproductive performance in a Manawatu Romney flock with 21% and 14% more lambs born to supplemented than to control mixed-age ewes in 1996 and 1997 respectively. Supplementation also resulted in improved perinatal lamb survival, although this effect was greater during the wetter 1996 Lambing season. Despite the production response during both years, a difference in lamb thyroid:bodyweight ratio was only noted following the drier 1997 winter. Ewe thyroid hormone concentrations before mating and during mid-pregnancy were poor indices of deficiency. CONCLUSIONS: Iodine deficiency should be included in the list of differential diagnoses for poor reproductive performance in ewes and in the investigation of high perinatal lamb mortality rates. CLINICAL SIGNIFICANCE: The annual cost associated with iodine deficiency in this Manawatu Romney flock is conservatively estimated at dollar 6.00 per ewe. This economic loss is considerably greater than the annual cost of iodine supplementation using iodised oil.
N D Sargison; D M West; R G Clark
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  New Zealand veterinary journal     Volume:  46     ISSN:  0048-0169     ISO Abbreviation:  N Z Vet J     Publication Date:  1998 Apr 
Date Detail:
Created Date:  2005-07-20     Completed Date:  2005-10-03     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0021406     Medline TA:  N Z Vet J     Country:  New Zealand    
Other Details:
Languages:  eng     Pagination:  72-5     Citation Subset:  -    
Department of Veterinary Clinical Sciences, Massey University, Palmerston North, New Zealand.
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