SEASONAL CHANGES ON REPRODUCTIVE PARAMETERS IN ALGERIAN REMBI RAMS

Abstract

This study was conducted to determine the effect of season on three main parameters of sexual activity in Rembi rams in Algeria during 12 months period. The experiment involved a monthly measurement of plasma testosterone (T) level, scrotal circumference (S.C) and body weight (B.W) in ten adult rams, aged between 2 and 6 years and raised under semi-extensive system, in permanent contact with the ewes. The data collected showed a significant effect of season on the parameters studied. The seasonal variations have showed higher values ​​during spring and autumn with a maximum in April for the testosterone levels (3,45±0,14 ng/ml), in November for the scrotal circumference (34,7±2,00 cm) and the body weight (82,3±1,28 Kg). The lower values ​​were recorded during periods of very high temperatures in summer, during food restriction periods and poor grazing in winter, with an annual minimum in June for the testosterone levels with 0,47±0,02 ng/ml and in July for the scrotal circumference (31,58 cm) and the body weight 80,93±1,20 Kg.

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COMPARISON OF ETHANOLIC EXTRACT YIELD, pH, POLYPHENOLS AND FLAVONOIDS IN ALGERIAN PROPOLIS COLLECTED FROM VARIOUS GEOGRAPHIC REGIONS

Abstract

The present work aims to evaluate the yield, pH, the total polyphenols and flavonoids contents in propolis collected from different ecosystems in Algeria. Ten samples of propolis, issued from different floral and geographical origins, have been collected by beekeepers between March and April 2015 and were classified according to the geographical regions (Est, West, Center and South) the samples were labeled from P1 to P10 and kept in dark at 4°C until use. The determination of polyphenols and total flavonoids contents was carried out in a specialized laboratory in Belgium. In this study, the propolis collected from the southern and western regions had the highest concentrations of polyphenols 99,98; 71,6 and 76,1 Gallic acid/g of propolis. The same result was obtained for flavonoids with 54,4; 38,7 and 42,9 mg Quercetin/g propolis. The higher yield, after ethanolic extraction of the propolis, was obtained from the southern region sample (P10) with a rate of 39,32%. Our study showed that the richest propolis samples of Algeria, in total flavonoid and total polyphenol contents  were the ones collected from the southern (P10) and the western region (P6 and P8).

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