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Thirteen primiparous Egyptian buffaloes (Babalus bubalis) were chosen at their late pregnancy (2 months before calving) and were closely monitored throughout the days near the expected date of calving. They calved during the period from November until December 2013. The buffalo heifers were divided into three groups according to their lactation period (LP). The first group (G1) was those lactated more than (7) months and the second group (G2) were those lactated less than (7) months. Whereas, the third group (G3) were those did not lactate postcalving. Milk samples (30 ml each) were collected once weekly from each lactating buffalo. Milk samples were collected simultaneously at the same day of collecting blood samples at 6:00 am and 6:00 pm. Milk samples were kept frozen at (-20C) in the present study. The average lactation period (LP) in G1 (225 day) was higher than that in G2 (175 day). Milk total solids decreased from 17.71% (in early lactation) to 16.69% (in mid lactation). Also, in G2 it decreased from 16.93% (in early lactation) to 15.11% (in mid lactation). Values of milk solids not fat (SNF %) were insignificantly higher in G2 than that in G1. The percentage of SNF in early lactation was higher than that in mid and late lactation. The milk fat % was significantly (P ≤ 0.01) higher in G1 than that in G2 by 34.22% during the lactation period. Also, There was significant (p ≤ 0.01) increase in milk fat % from early to late lactation in G1 compared to G2. Milk protein % was higher in G1 than that in G2 by 6.96 %. Milk lactose percentage was significantly (p ≤ 0.01) higher in G2 than in G1 by 18.1%. Milk water was significantly (P ≤ 0.01) higher in G2 than that in G1. The blood plasma Insulin like growth factor-1 (IGF-1 ng/ml) was significantly and gradually increased starting at precalving to postcalving periods. During the precalving period, G1 showed a significant decrease in PRL concentration from 200.67 ± 3.18 ng/ml at day -30 to 198.16 ± 4.07 ng/ml. at the day of calving. The concentrations of IGF-1 through the lactation stages (early, mid and late lactation) were significantly steadly increased with the advancement of lactation in both groups. The prolactin PRL concentration in G1 was slightly higher in early and mid lactation than that in late lactation. In conclusion the level of blood plasma IGF-1 and PRL during the last 2 month of gestation give a good indicator to the lactation period and milk yield production.

PHYSIOLOGICAL ROLE OF BLOOD PLASMA INSULIN LIKE GROWTH FACTOR- 1 AND PROLACTIN IN LACTATING OF PRIMIPAROUS EGYPTIAN BUFFALOES