Abstract
The absolute amount of the epithelial tissue in the thyroid (Eg) of cows was significantly and more closely correlated with the body weight corrected for pregnancy and/or degree of fatness than with the live weight. Age had practically no effect on the Eg, this observation being of value in case cows of various ages are to be used as material in studies on the incidence of endemic goitre. Due to a group of goitrous cows in the investigated material, significant negative correlation was obtained between the Eg and the milk yield. The implications of this discovery are discussed.
Highlights
Feeding and management of the herd, data concerning the cows, and the methods used in estimating the live weight and corrected body weight, the average daily fat-corrected milk yield (FCM) during the productive lifetime of the cows, etc., have been explained in detail earlier (Kossila 1967, p. 32—40)
Further details concerning the present cow material can be found in a previous study (Kossila 1967 pp. 71 —80) to which this paper is a direct continuation
The absolute amount of the epithelial tissue in the thyroid (Eg) of cows was significantly and more closely correlated with the body weight corrected for pregnancy and/or degree offatness than with the live weight
Summary
The purpose of this study was to find out whether there were any significant correlations between the absolute amount of epithelial tissue contained in the thyroid gland of the cows and their body weight, age, and capacity of milk production
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