Study of the Hydroponic Barley Effect on the Performance of Feedlot of Calves in the Region Souss Massa (Southern Morocco)

The objective of this research is to investigate the effect of the introduction of hydroponic barley; produced as feed supplement in the ration, on the performance of feedlot calves. This study was performed in the Taroudant region (South of Morocco), during a trial period between July and October 2017). A total of 100 calves were used in a feeding trial, which were divided into two groups. The calves of the first group received a total mixed ration (control), while the calves of the second group received a similar ration with the addition of hydroponic barley.Similar growth performance is observed for the two groups, which is easily explained by the equivalent rationing. In the finishing phase, however, a higher average daily gain is observed for the group fed with an enriched diet in hydroponic green fodder. In fact, the average daily gain for this group amounts to 1.48 Kg/Day compared to 1.42 Kg/Day for the control group.The slaughter results confirm those noted in terms of growth performance, with a relatively similar carcass yield for the two groups.However, since hydroponic fodder reveals a positive impact especially at the level of the finishing phase, it seems judicious to introduce it in the key phases of fattening and finishing in order to perfect the weight gain of the species benefiting from this contribution.The test results suggest that hydroponic barley based rationing is to deepen, and that it would be desirable to repeat the experiment by testing different levels of hydroponic barley intake, adjusting both the type and the level of complementation, with a more accurate monitoring of feeding. Keywords: Feedlot calves; Growth, Hydroponic barley, Performance, DOI: 10.7176/JBAH/11-14-05 Publication date:July 31st 202

Valorisation du gaz de synthese, du methanol et du formiate de methyle par catalyse supportee et electrocatalyse

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Assessment of heavy metals released into the air from the cement kilns co-burning waste: Case of Oujda cement manufacturing (Northeast Morocco)

The metallic contents released into the air from cement kilns of Oujda cement plant have been investigated. Heavy metal (HM) concentrations of kiln gas emissions were evaluated and compared to Moroccan standards. The analyzes revealed the presence of various trace metals, i.e., mercury (Hg), cadmium (Cd), thallium (Tl), cobalt (Co), antimony (Sb), arsenic (As), lead (Pb), tin (Sn), selenium (Se), tellurium (Te), chromium (Cr), copper (Cu), manganese (Mn), nickel (Ni), vanadium (V) and zinc (Zn) in atmospheric emissions of the cement kiln. Analysis of emitted gas revealed that emissions originated from cement kiln #1 were generally in the same order of magnitude as those released from the cement kiln #2. Concentrations of the HMs were found to be higher when the raw mill was not in operation compared to those during operation. Gas emissions remained always below the National Regulation Limit Values (RLV). For the period 2008–2009, results showed that the average values of the metallic abundance were in the order Zn > Mn > Se > Te > Sb > As > Cr > Tl > Pb > Ni > Sn > Cu > Hg > Cd > Co > V, for the cement kiln #1.In addition, Oujda cement plant emissions were assessed over the period 2010 to 2015. The annual average values of HMs were successfully measured, regardless of whether the raw mill was on or off. Therefore, our results suggest that the metal contents from Oujda cement kilns co-burning waste were well below the RLV. Keywords: Cement kilns, Co-burning Lafarge–Holcim–Oujda, Heavy metals, Refuse derived fuel, Hazardous air pollutant

Treatment of textile industry wastewater by electrocoagulation coupled with electrochemical advanced oxidation process

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