ALI BEN ROMDHANE¹

ADNEN SANAA¹

IMTINENE HAMDENI²

SANA DHANE¹

SLIM SLIM¹

CHAHINE KARMOUS³

¹ Research Unit of Biodiversity and Valorization of Resources in Mountainous Areas, School of Higher Education in Agriculture of Mateur, University of Carthage, Tunisia

² Laboratory of Natural Substances, National Institute of Research and Physico-chemical Analyses, Biotechpole of Sidi Thabet, Ariana, 2020, Tunisia.

³ Laboratory of Genetics and Cereal Breeding, National Institute of Agronomy of Tunisia, University of Carthage, LR14 AGR01, 1082 Tunis, Tunisia.

DOI: https://doi.org/10.55416/sunb.jns01.2201.08706

Abstract – The roots of Chrysopogon zizanioides (L.) Roberty, belonging to the Poaceae family, are the main source of volatile that has substantial value in perfume, cosmetics, pharmaceutical and food industries. The study of C. zizanioides volatiles, obtained from plant roots cultivated in Tunisia, using GC and GC/MS revealed that more than 50 compounds were detected of which 14 constituents were identified representing 33.87% of the total. Oleic acid (17.09%) and (E) -3-Eicosene (7.77%) were the major components at the species level. However, 10,13 methyl ester octadecadienoic acid (0.01%), (Z) - 9,17-octadecadienal (0.01%), (Dimethylethyl-1,1) Bis-2,6 Methyl- 4 Phenol (0.04%), methyl pentadecanoic acid, 13-methyl-, methyl ester (0.05%), (Z) -13-octadecenal (0.06%) and linoleic acid ethyl ester (0 , 06%) are the constituents which have the lowest contents.

Keywords: Vetiver, Volatile, Perrenial crop, Tunisia

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RIM WERHENI AMMERI ^1,2

SALMA KLOULA

INES MEHRI¹

WAFA HASSEN³

ABDENNACEUR HASSEN ¹

¹ Laboratory of Treatment and Valorization of Water Rejects, Center of Research and Technologies of Water (CERTE), Technopole Borj-Cédria, Tunisia, Tunisia.

² Eremology and Combating Desertification, Arid Regions Institute of Medenine, Tunisia

³Research Unit of Analysis and Process Applied to the Environmental, APAE Higher Institute of Applied Sciences and Technology Mahdia, the University of Monastir, Monastir, Tunisia

DOI: https://doi.org/10.55416/sunb.jns01.2201.08704

Abstract – The accumulation of organic pollutants, pesticides, fertilizers, etc. causing critical health trouble to humans, animals, many aquatic ecosystems, and plants. This study evaluated the elimination of the pesticides as pentachlorophenol (PCP: 800 mg L⁻¹) by bioaugmentation process in sterile secondary treated wastewater (STWW) and mineral salt medium (MSM). Also, the impact of surfactant addition (sodium dodecyl sulfate ‘SDS’ and Cetyltrimethylammonium bromide ‘CTAB’) in PCP elimination phenomena. The PCP rate in different treatments was analyzed by high-performance liquid chromatography (HPLC). The bacteria biomass was measured through a spectroscopy approach at 600 nm optical density (OD₆₀₀). The chloride rates were determinate through the calorimetric approach. In addition, the STWW disinfection was released through the UV radiation technique. The HPLC analysis confirmed that the strain P. mosseli HM627603 and P. putida HM627611 were able to tolerate and remove respectively 99.6 and 76.12% of PCP (800 mg. L^-1). The chloride rates increased after 7 days in all treatments with a value of 0.64 to 3.12 g L^-1 for P. mosseli HM627603 in MSM. The SDS surfactant induces an increase in the PCP elimination from STWW through P. putida HM627611. The bacterial inactivation became quicker within 80 seconds in sterile STWW supplemented with PCP at 800 mg L^-1 for P. putida HM627611 tested in agar medium.

Keywords: Bioaugmentation, Pentachlorophenol, Wastewater, UVC-254 inactivation, Pseudomonas

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MOHAMED AMIR BOUZAIDA¹

BELHASSEN ABDELKAFI²

MAHRANE CHERIF³

¹Institute of Arid Regions, Médenine, University of Gabès, Tunisia

²Higher School of Agriculture of Mograne, Zaghouan, University of Carthage, Tunisia

³Office des Terres Domaniales, Tunis, Tunisia

 DOI: https://doi.org/10.55416/sunb.jns01.2201.08703

Abstract – The objective of this work is to carry out a comparative study between irrigated and rain-fed olive farms in arid area, Zarzis belonging to Southern Tunisia. In order to achieve this objective, a survey was carried out on nearly 30 farms: 13 are in the irrigated lands and 17 are in dry areas. As a first step, we proceeded through a socio-economic, technical and environmental assessment in order to determine the characteristics of each type of farms. As a second part, we tried to identify the strengths, weaknesses, opportunities and threats specific to the olive sector in this arid region, through SWOT method. The assessment shows that the irrigated farms were the object of modernization process, whose owners are really investors, aiming a rapid profitability by this farming activity. The farms are characterized by a high density of olive tree plantations and the stability of yields. Thus, they represent a source of employment in the region. On the other side, dry olive farms have a classic production system and low yields, generating not only a problem of profitability, but also of the viability of these farms, which explains the abandonment of these lands.

Keywords: olive farms, arid area, Southern Tunisia, Zarzis

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ATOUI AHLEM¹

LAROUSSI AICHA²

ABDENNEBI MOLDI¹

BEN SALEM FARAH¹

NAJARI SGHAIER¹

¹Laboratory of Livestock and Wildlife, Institute of Arid Regions, Medenine, University of Gabès, Tunisia

² National Agronomic Institute of Tunisia, University of Tunis, Tunisia.

DOI:  https://doi.org/10.55416/sunb.jns01.2201.08702

Abstract – In order to estimate some equations of daily milk production from linear body measurements of 85 local lacting goats were used in the present study. The morphostructural parameters included body length, withers height, heart girth and hip height, the body weight and the daily milk were recorded weekly from from the 7^th postpartum day up to the end of lactation period. Four models were tested to estimate daily milk from some body measurements. A high correlation between daily milk and all linear body measurements was obtained. A significant correlation (p<0.05) were obtained between all linear body measurements and daily milk yield. The high value of correlation was presented between body weight and the daily milk (r=0.66). A estimates equation with coefficient of determination (44%) has been got to estimate daily milk with (R²). The daily milk of local goat could be estimated from linear body measurements and it could be use the goats' body weight and withers height as a good measurements to predict daily milk with reasonable R².

Keywords: Local goats, daily milk production, regression coeffecient, body measurement, prediction.

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Facteurs d’ajustement des performances laitières pour le mois de vêlage, l’âge au vêlage et la durée de lactation pour la race Holstein en Tunisie

N. BAKRI

M. DJEMALI

¹ Laboratoire des Ressources Génétiques Animales et Alimentaires, Institut National Agronomique de Tunisie, Université de Cartahge, 1082 Cité Mahrajène, Tunisie.

DOI: https://doi.org/10.55416/sunb.jns01.2201.08701

Abstract – Multiplicative adjustment factors for month of calving, age at calving and lactation length were computed for complete lactation records (n= 11’175) recorded between 2012 and 2017 from 6251 dairy cattle raised in 33 Holstein dairy herds. An animal model was used with fixed effects for herd-year-sector, month of calving and age at calving and random and the residual random error. The objectives of this study were: 1) to examine the effect of the non-genetic factors on the milk yield production, 2) to adjust milk yield for non-genetic sources of variation and 3) to examine the effect of milk yield adjustments on estimates of the genetic trend. Main results showed that month of calving, age at calving and lactation length were significant sources of variation for milk yield. Cows calving in the fall and early winter yielded 430 kg and 455 kg more milk than cows calving in spring and summer, respectively. Holsteins in Tunisia reached their maximum milk yield between 68 and 70 months of age. Average adjusted milk yield for days in milk, month and age of calving was 6621±2883 kg. An overall rate of increase in milk yield was found to be 22.68 kg/year over the 15 years period.

Keywords: Adjustments, genetic, milk, Holsteins. calving

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