VetSRev
Database of veterinary systematic reviews
Database of veterinary systematic reviews
As endemic goitre was widespread in New Zealand before the introduction of iodized salt, it was assumed that ruminants, particularly dairy cows, may benefit from iodine supplementation although clinical signs of I deficiency are rare. Several trials with sheep have not indicated any significant response in productivity to I supplements, but no definitive trials have been made with dairy cows. Estimates of pasture I concentrations are variable and requirements for lactating cows are imprecise. To ascertain the possibility of a response to I supplements, 2 literature searches, with CAB ABSTRACTS and DIALOG, were made and the procedures involved in each search are described. There were only 3 data sets in which the effect of I supplementation was studied in cows with an inadequate I intake. There was no response in terms of milk production or composition. It is suggested that, in the absence of goitrogens, pasture I less than 500 mu g/kg DM may be adequate for lactating cows but there are insufficient data on pasture or milk I in New Zealand to make an informed judgment on I status in dairy cows.
Waghorn, G. C., & Northover, S. A. (1992). Milk production response to iodine supplementation – will it work in New Zealand cows: results of a literature search (J. Lee, M. A. Turner, K. N. Joblin, N. D. Grace, & G. P. Savage, Eds.). Massey University. [Indexed using CAB Thesaurus terms], animals, Artiodactyla, Chordata, eukaryotes, mammals, ungulates, vertebrates, Bos, Bovidae, cattle, cows, ruminants, Australasia, Commonwealth of Nations, Developed Countries, Oceania, OECD Countries, Animal Nutrition (Physiology) [LL510], Dairy Animals [LL110], feeding, milk production, milk yield, New Zealand, goitre, iodine, nutritional state, supplements