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The aim of this study is to test two different methods for evaluating the in vitro antibacterial effect of Thymus fontanesii Boiss. et Reut. essential oil against standard and clinical bacterial strains responsible for bovine mastitis: the disc diffusion method or the aromatogram which allows the demonstration of the antibacterial power of essential oils on the bacterial strains tested, Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923 and two strains isolated from bovine mastitis milk S. aureus and E. coli. The inhibition activity of the essential oil of T. fontanesii on bacterial strains by the two methods shows that the antimicrobial power of this oil is very important and is characterized by bactericidal and bacteriostatic action against gram negative and gram positive bacteria. The antimicrobial evaluation by the aromatogram showed good antibacterial activity against all the strains tested, the zones of inhibition of the bacteria were between 23,33±1,527mm and 37,5±3,535 mm. The search for minimum inhibitory concentrations MIC and bactericides CMB made it possible to quantitatively assess the antimicrobial power of this essential oil. In this work, the MIC was 0,625 µl/ml for all strains tested, and the lowest CMB was that of T. fontanesii against E. coli ATCC 25922 was 0,625 µl/ml.

The aim of this study was to assess the variations of certain biochemical parameters in postpartum goats in two seasons (spring and winter). A total of fifty goats of local cross breeds in their twentieth days after parturition were used in the experiment from 2019 to 2020. Animals were reared in Tiaret region in the north-west of Algeria (35°22' N, 1°19' E) under semi-arid environment. Two blood samples were taken in heparin vacuum tubes, 25 samples in each season winter and spring, the blood was centrifuged at 3000 round for 10 minutes, The assay of the biochemical substrates was carried out with a "Beckman coutter" biochemical analyzer. Our results show that all the mean values recorded during this study were within the range of standards cited in the literature and the season had a significant influence (p <0.05) on creatinine and calcium with high values in winter and decreases in spring, while the values of triglycerides, total protein and globulin were higher in winter and lower in spring without any significant difference, unlike the average values of urea, albumin, and phosphorus that increase in spring and decrease in winter. The results of this study could serve as reference values for local Algerian goats in postpartum and goats from other regions or countries with similar climatic and physiological conditions.

The aim of this study was to determine the influence of sex and type of birth in Arabia goat breed kids raised in western Algeria. Our study was conducted in the Livestock Technical Institute of Ksar-Chellala in Tiaret region between 2016 and 2017. For this study, eighty-one kids were weighted monthly since birth until 360 days old. The influence of sex, age and type of birth on the kid's weight was analyzed statistically. In this work, birth mean weight for males was about 3.16±0.58 kg significantly (p< 0.05) higher than 2.88 ±0.50 for females, the mean weights at birth for all kids was 3.06±0.57 kg. The birth type influenced significantly (p<0.05) the kid's weight between birth and 30 days old, single born kids were heavier 3.38±0.51 kg than twins 2.89±0.53 kg and triplets 2.60 kg. In this work, both sex and birth type influenced significantly the weight at birth in kids.