Abstract
SUMMARY This experiment was conducted during 2010 (August and September) in two buffalo farms located at Giza (F1) and Qena (F2) governorates. A total of 10 buffaloes (3 to 6 parities) was assigned to two experimental groups (n=5 per location). Blood samples were collected fortnightly at 09:00 h before feeding all the experimental animals to assess Leptin and IgG profiles as affected by Temperature Humidity Index (THI). To calculate the THI, meteorological data were collected at the two locations of the experiment. The results demonstrated that Leptin concentration was greater (P<0.05) in F1 (4.15±0.41 ng/ml) than F2 (1.86±0.41 ng/ml). There was a negative (P<0.05) correlation between Leptin and THI (r = -0.37). No significant (P<0.05) difference in IgG levels was observed among animals in the two farms. The plasma IgG concentration in buffaloes reared at F1 (19450±1480 mg/l) was greater than that of F2 (18439±1480 mg/l). There was no correlation between the levels of leptin hormone and total IgG. In conclusion, the increase of heat load during August to September presented as THI on lactating buffalo decreases their leptin hormone and total IgG level in blood plasma.
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