تحديد تركيز هرمون اللبتن في بلازما دم المعز الشامي ضمن الموسم التناسلي

الملخص EN

The aim of the present study was to determine the leptin level in plasma of shami goats during the early breeding season.

A total of 460 blood samples were collected from ten multiparous non -pregnant Shami does before feeding during 46 days (from 11 Aug.

to 26 Sep.

/ 2015) via jugular venipuncture and centrifuged at 3000 rpm for 20 min.

The plasma was harveSed and Sored at -20°C until hormonal analysis by Radioimmunoassay (RIA).

Data were analyzed using PROC GLIMMIX (SAS, 2008).

Differences in least square means for leptin levels were subjected to Tukey teS No significant (p > 0.05) differences were recorded in mean leptin concentrations between cyclic and non-cyclic goats, however, leptin was more Sable in the cyclic goats.

The overall mean of leptin concentration was 3.5 ± 0.94 and 3.7 ± 0.47 ng/ mL in cyclic and non- cyclic goats.

It may be concluded that there was very little changes in leptin concentration during the early breeding season, therefore, Leptin level cannot be consider as a reliable indicator for cyclicity in Shami goats.