The Arab Center for the Studies of Arid Zones and Dry Lands

Damascus, United States

The Arab Center for the Studies of Arid Zones and Dry Lands

Damascus, United States
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Reiad K.,The Arab Center for the Studies of Arid Zones and Dry Lands | Masri Y.,Damascus University | El-Herek I.,The Arab Center for the Studies of Arid Zones and Dry Lands | Al-Azzawi W.,The Arab Center for the Studies of Arid Zones and Dry Lands | And 5 more authors.
Kafkas Universitesi Veteriner Fakultesi Dergisi | Year: 2010

This study was conducted at the Agricultural Scientific Research Centre in Syria within the Arab Center for the studies of the Arid Zones and Dry Lands (ACSAD). Milk yield records from 6411 Awassi ewes were collected between 1991-2005. These records were used to evaluate the factors influencing the milk production and to define the differences between the selected meat and milk lines. Results showed that lactation milk yield (LMY) was significantly (P<0.01) affected by ewe line (EL), year of production (YP), parity (P) and birth type (BT). Lactation period (LP) averaged 157.69±0.63 days and was significantly affected (P<0.01) by the same factors with the exception of birth type (BT). Lactation milk yield for the whole flock averaged 243.3±3.96 kg with significant differences (P<0.05) between milk and meat lines (272.5±4.93 vs. 224.0±4.88 kg respectively). Ewe body weight at lambing was also found to have a positive effect (P<0.01) on LMY. Lactation milk yield increased at a rate of 1.35 kg for each 1kg the ewe was above average body weight at lambing. These results provided evidence that the response to selection program for milk traits in Awassi sheep is significant. Selection for LMY can be improved with a simplified record system.


Hadded R.,National Institute of Agronomy of Tunisia INAT | Nouiri I.,National Institute of Agronomy of Tunisia INAT | Alshihabi O.,The Arab Center for the Studies of Arid Zones and Dry Lands | Massmann J.,Federal Institute for Geosciences and Natural Resources | And 4 more authors.
Water Resources Management | Year: 2013

This paper describes the development of a Decision Support System (DSS) for groundwater management of the 'Zeuss Koutine' aquifer in southeastern Tunisia using the WEAP-MODFLOW framework. First, a monthly MODFLOW model was developed to simulate the behaviour of the studied aquifer. A conceptual model of the study area was designed and a WEAP schematic representing the real hydraulic system was developed. In addition to the studied aquifer, other water resources available in the region, such as desalination plants and groundwater, were taken into consideration in this DSS. Inputs to the hydrogeological model include natural recharge and inflow from higher neighbouring aquifers. Outputs are mainly agricultural, touristic and urban water consumption. It was shown that the DSS developed was able to evaluate water management scenarios up to 2030, especially future water consumption, transmission link flow and active cell heads of the MODFLOW model for each time step. Results for the Zeuss Koutine aquifer demonstrated that desalination plants already built in the cities of Jerba and Zarzis have contributed to decreasing the continuous drawdown observed before 1999. The use of a sea water desalination plant to supply Jerba and Zarzis in the future is a solution for reducing the Zeuss Koutine aquifer drawdown. Defining its optimal capacity over time poses a new research question. © 2013 Springer Science+Business Media Dordrecht.

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