تعيين اثر آغوز بر روي فعاليت غده تيروييد و فوق كليه گوساله

Determination of the effect of colostrum on function of adrenal and thyroid glands of calf

This experiment was carried out to study the effect of feeding different levels of colostrum on the activity of adrenal and thyroid glands during the first week of life were investigated. 18 calves were allocated in three groups of 2,1 and 3(n=6). Calves were fed colostrum twice daily for 3 days (group 2), or colostrum only as their first meal (group 1), or they received only milk replacer, no colostrum (group 3). Postprantial plasma gloucose concentrations on day 2 were higher in group 2 than two other groups (P<0.05). Plasma concentrations of T3 and T4 decreased during the first week of life in all groups. Circulating concentrations of plasma cortisol had reducing pattern in all animals, but on days 2 and 7 plasma cortisol levels were higher in group 3 than two other groups (P<0.01).