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In heat-stressed cow received cysteamine compound (Lactonin) the rectal temperature decreased (P<0.05), milk yield, fat-corrected milk, milk fat and feed conversion rate (FCR) increased (P<0.05). These changes were companied with trendy (0.05<P<0.15) of higher milk protein and lower somatic cell count. Additionally, plasma insulin enhanced (P<0.01) signifi cantly in Lactonin herd (n=49), whereas T3 and T4 tended (0.05<P<0.15) to decline. The data show that Lactonin helps heat-stressed cow to maintain a more normal metabolism in hot summer, this positive effect of Lactonin on cow performance was associated with Lactonin-dependent alteration of plasma insulin, T3 and T4.

Effects of cysteamine compound on milk production and hormonal responses of lactating cow during heat stress