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Eighteen lactating buffaloes were used to study the effect of season on milk production performance and some blood biochemical indicators. The study included two seasons, summer and winter. Milk samples were collected at weekly intervals, while blood samples were collected after one month from calving from each animal. Plasma alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP), total protein (TP), albumin, total cholesterol (TC) and triglycerides (TG) levels were determined. Results indicated that, during summer season THI values were higher than those of the thermoneutral zone, while in winter it was within the thermoneutral zone of lactating buffaloes. Milk production was significantly lower under heat stress in summer than that in winter when ambient temperature (Ta) was around the thermoneutral zone. Daily milk yield average (DMY), fat corrected milk yield (FCM) and total milk yield (TMY) in addition to milk protein % were significantly higher in winter than those in summer season. Whereas, milk lactose, fat and total solids (TS) % did not differ between winters and summer seasons. ALT was significantly higher in winter than in summer season, while AST, ALP, total protein (TP), albumin and globulin showed no significant differences. Albumin/globulin ratio (A/G ratio) was within normal values and did not also differ between seasons. A significant positive correlation was found between plasma ALT and each of DMY, FCM and TMY. Also, between plasma ALP levels and each of lactose, TS and SNF and plasma TG levels with milk fat %. In concultion, in winter season, buffaloes produced more milk and milk components than summer season. Plasma ALT activity could be used to predict TMY, FCM and average of DMY, meanwhile plasma ALP activity could be used to predict milk TS and SNF contents.

MILK PRODUCTION PERFORMANCE AND SOME BIOCHEMICAL BLOOD COMPONENTS IN EGYPTIAN BUFFALOES AS AFFECTED BY SEASONAL VARIATION