بررسی مقایسه ای ماکروسکوپی و م کیروسکوپی غده ی تیرویید در نشخوارکنندگان به ظاهر سالم )بز، گوسفند و گاو(

The aim of this study was to examine the lesions of thyroid gland in apparently healthy ruminants. forthe first time disease of thyroid gland have been recorded in all kinds of animals. a total of 360 pairs (90each from sheep and goat and 180 from cow) of thyroid which showed various macroscopic abnormalitieswere collected for detailed examination. the samples were fixed in 10% formalin salin, the tissuewere processed through routine method for paraffin embedding. sections cut at 5-7 ?m were stained byhematoxylin and eosin method. the pathologic conditions observed in thyroid glands of these animalsincluded of simple colloid goiter: goat 12 (13.3%) cow 21 (11.66%) sheep 14 (15.5%). hyperplasticgoiter: goat 43 (47.7%) sheep 30 (33.3%). parenchymal cysts: goat 3(3.33%) cow 22(12.2%)sheep8(8.9%). ultimobranchial nodules: goat 7 (7.7%) sheep 16 (17.8%) follicularatrophy: goat 10 (11.1%)cow 11 (6.66%) sheep 5 (5.5%). inflammatory and degenerative lesions: goat 4 (4.4%) cow 12 (6.6%)sheep 2 (2.2%). without lesion: goat 11 (12.2%) cow 114 (63%) sheep 15 (16.6%). finding of a highnumber lesions in these animals is interesting, since there is paucity of report in these domestic animals.this needs further investigation to elucidate our result.keywords: thyroid gland hyperplasia, ultimobranchial nodule, parenchymacyst, folicular atrophy.