الفهرس 
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Abstract
The effect of treating dairy cows with recombinant bovine somatotropin (rbST) starting on day 65±3 or 105±3 postpartum with or without supplementation of monensin sodium (RM)on the lactation and reproductive performance , milk fat and protein contents, body condition score (BCS),and health, were evaluated using eighty four primiparous (34)and multiparous (50) Holstein-Friesian cows in a commercial herd (n=1200 lactaing cows) located at Cairo-Alex.Desert road, near El-Nobaria city Cows were randomly assigned to almost equal groups based on parity, days in milk (DIM), average daily milk yield, and BCS, within day of rbST administration (on day 65±3 or 105±3p.p. )and supplementation of RM (supplemented or non-supplemented). Therefore, the five groups were as follows : group 1 :received rbST from day 65 to day 245 p. p. +RM from day 21 to day 245 p. p. group 2 : received rbST from day 105 to day 245 p. p. +RM from day 21 to day 245 p. p. group 3 : received rbST from day 65 to day 245 p. p. with no RM given after day 21 p. p. group 4 : received rbST from day105 to day 245 p. p. with no RM given after day 21 p. p. group 5 (control): no rbST treatment and no RM given after day 21 p. p.