الفهرس 
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Abstract
The aim of this study to know the extent of change in the level of PTH in the different periods of age in young calves. As well as, the changes in different physiological events as after calving, suckling and weaning, also to know the relation between bone growth and some elements that share in bone formation. Another aims of this study to know the activity of bone growth through the measurement of some bone markers in these calves and their dams during the respective gestation period and after calving.