Keywords : ,،,؛sheep leptin,,
Iraqi Journal of Veterinary Sciences,
The aim of the current study was to find out the relationship between leptin, progesterone, bodyweight with the onset of puberty in the ewe lambs.
Eight healthy weaned local breeds of ewe lambs at the age of 90 days were introduced in the study, Body weights were recorded, blood samples serum was collected and stored at -20°C until hormonal assays. ovaries and ovarian follicles were checked by ultrasound used to measure follicular diameter every two weeks until estrus was detected.
The result showed that the earliest estrus behavior was noticed at age 202 days. Significantly increased body weight was recorded during the trial times at p ≤ 0.05 Moreover leptin level elevated significantly coinciding with the age of puberty at p ≤ 0.05. Also, progesterone level was elevated significantly as the age of puberty at p ≤ 0.05. In addition to that the follicular diameter record a significant increase from day 160 till the end of the trial. Studying the correlation among, leptin, progesterone, and follicle diameter revealed a direct correlation with puberty and total weight body at pre-puberty days. In addition, a close positive direct correlation was observed between the level of progesterone and the diameter of the follicle with the level of the leptin as progressing age of puberty, and the increase in the diameter of the follicle with a rise in the level of progesterone.
The study concludes, was found a strong positive correlation among the studied parameters with a time of puberty in ewe lambs.