EFFECT OF SOME MANAGEMENTAL ASPECTS, SEX ASSOCIATION, LIGHT, AND MELATONIN TREATMENTS ON PUBERTY OF RAHMANI EWE LAMBS

Document Type : Original Article

Author

Dept. of Hygiene and preventive Medicine., Fac. Of Vet. Med. Kafr-El-Sheikh, Tanta University, Egypt.

Abstract

This study was carried out on 36 apparently healthy and recently weaned Rahmani ewe- lambs and two adult rams. These animals were raised at Mehallet Mousa, Animal Production Research Station, Kafr EL- Sheikh Province, Egypt The animals were divided into four groups (Sex associated, light and melatonin treated groups and Control one) to investigate the effect of these managemental aspects on their puberty age and weight .The ewe lambs reared by sex associated, light and melatonin attained their puberty at an earlier age (6.9, 6.1 and 5.8 months, respectively) and lower body weight ( 30, 29.22 and 28.15 Kg, respectively) than those which un- treated (7.4 months and 32,6 Kg, respectively). As well as, the progesterone concentrations showed significant difference between treated groups and control one.
There is no difference in behavioral signs of oestrus among different treatments but the conception rate showed variations by treatments as it de- creased by treatments in compared with control group.
From this study, we concluded that the application of such managements; sex association, light and melatonin treatment pre- pubertal were beneficial to decrease the puberty age but melatonin administration has low conception rate.

Main Subjects

Veterinary Medical Journal (Giza)
Volume 50, Issue 4
October 2002
Pages 895-903

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