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Evaporation from reservoirs is an important issue frequently occurring in dry, hot regions like Iran. Since the laboratory and field studies of evaporation control are difficult, time-consuming, and costly, and the investigation of various possible modes is not possible, numerical models with high capabilities are widely used to analyze the hydrological processes. This article aimed to investigate the effect of windbreaks on reducing evaporation of lakes and reservoirs in dry areas and determine the most optimal location and layout of windbreaks using the FLUENT model. Initial investigations showed that wind is the most important factor of evaporation in the Chahnimeh Region of Sistan, Iran. The results showed that if solid windbreaks with 25% casement (height of 2 and distance of 66 m) are vertically installed in a northwesterly direction, evaporation can be effectively reduced. Although the use of wind breaks in Chahnimeh can help significantly reduce evaporation, it cannot be fully controlled. That is why diagonal windbreaks with 30, 45, and 60º were designed to integrate the windbreaks with other evaporation control methods such as solar panels. The results showed that 60º had the greatest amount of evaporation reduction and were integrated with other methods to control evaporation.
The aim of the study was to determine the effects of type of grain processing and grain source on growth performance of calves. Thirty-two male Holstein calves were randomly assigned to 1 of 4 treatments differing in type of grain processing and grain source: CON – ground maize + ground barley, DMGB – dry-rolled maize + ground barley, GMDB – ground maize + dry-rolled barley, and DMDB – dry-rolled maize + dry-rolled barley. All calves were fed for 14 days (starting from day 4 of experiment) and weaned on 60 day of age and remained in the study until day 74. It was obtained that final and weaning body weights were higher in DMGB and DMDB groups in comparison to CON group. The total dry matter intake was greater in calves fed DMGB diet than in those fed CON diet. Averaged daily gain (ADG) was greater in calves fed DMDB diet than in those fed CON diet during the pre-weaning and overall periods, whereas during post-weaning period the ADG was greater in DMGB group in comparison to CON treatment. Ruminal pH was greater in DMGB and DMDB groups as compared to other groups on days 46 and 60, while ruminal NH3 -N content was decreased in DMGB and GMDB groups. On day 46 glucose level was decreased in blood of animals fed all examined treatments. Blood β-hydroxybutyrate level was greater ( = 0.01) in group fed DMGB diet in comparison to CON and GMDB groups at weaning. In conclusion, starter diets containing dry-rolling maize and barley can better improve calf performance than diets containing ground maize/ ground barley
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