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Broiler males (n= 140) were used in a straight-run experimental design and distributed randomly among four treatment groups with seven replicates per treatment and five broilers per replicate. During 21-42 d old, the chickens were fed iso-caloric and iso-nitrogenous diets containing four levels of dietary vegetable oils (DVO), of 2.7, 4, 6 and 8%. During d 25-27, 31-33, and 38-40 of age, broilers were exposed to heat stress for 4 h a day (1000-1400 h) at 34 °C, 70-75 % relative humidity. Feeding an 8% DVO diet significantly increased body weight gain compared to the other DVO levels. The feed conversion ratio, protein conversion ratio, metabolizable energy conversion ratio and European production index were significantly enhanced due to feeding an 8% DVO diet compared to a diet containing 6% DVO. Feeding 8% DVO significantly increased the meat protein and lipid percentages, compared to the control group (2.7 % DVO), but decreased the plasma low-density lipoprotein, very-low-density lipoprotein and lymphocytes. Feeding 8% DVO significantly increased the mean cell volume and mean cell hemoglobin, and bursa weight and percentage compared to the control. In addition, 6 and 8% DVO significantly increased the plasma total antioxidant capacity compared to the control group, but decreased the malondialdehyde. Thus, broilers fed a diet containing 8% DVO have an increased tolerance to heat stress, as evidenced by increasing the productive performance, meat quality, blood hematological and biochemical traits, antioxidants and immunity. [ABSTRACT FROM AUTHOR]

A total number of 120 28 week-old laying hens of Gimmizah strain were distributed among four treatment groups in a completely randomized design with three replicates per treatment and ten hens per replicate. The first group kept as a control group received non-magnetized tap water and the other groups received tap water exposed to different intensity of magnetic strengths 2000, 3000 and 4000 gauss respectively. Laying hens were housed in 12 floor pens (2 m × 1.2 m × 2 m) furnished with wheat straw. Laying hens on - 3000 and 4000 gauss magnetized water consumed significantly more feeds and all groups on the magnetized water had significantly better feed conversion ratio (FCR) than the control group. Egg weight and egg mass were significantly increased in groups supplemented with different strengths of magnetized water compared with the control group and albumen (%) and albumen dry matter (%) were significantly higher of groups offered 2000 and 3000 gauss tap water. Yolk (%) was significantly higher of group on 3000 gauss tap water compared to the control group. Shell thickness was significantly increased in group received 4000 gauss tap water compared with control group. Blood serum glucose and globulin were significantly increased in groups supplemented with 2000 and 3000 gauss water compared with the control group and group supplemented with 4000 gauss water. However, all groups supplemented with different strength of magnetic water had significantly decreased albumin/ globulin ratio. Serum phosphorus level, and blood pH increased. Triiodothyronine increased significantly in groups received magnetized water compared to control and the 2000 gauss group showed the highest response. Red blood cell count (RBCs) and haemoglobin (Hgb) were significantly increased in groups supplemented with 2000 and 3000 gauss water compared with control group. It could be concluded that productive performance, physiological response and egg shell quality of Gimmizah chicken were improved due to offering magnetized water with 2000 gauss was adequate to provide the beneficial effects. [ABSTRACT FROM AUTHOR]

One hundred and forty 21-day old Arbor Acres broiler chickens were used in a straight-run experimental design. The broilers were distributed in a completely randomized design among four treatment groups with seven replicates per treatment and five chickens per replicate. During the experiment period (21 to 42 days old), the chickens were fed isocaloric and iso-nitrogenous diets containing four levels of dietary vegetable oils (DVO) (2.7, 4, 6 and 8%). During the period when chickens were 25-27, 31-33, and 38-40 days old, the chickens were exposed to heat stress for 4 hours a day (from 10.00am-2.00pm) at 34ºC and 70-75% relative humidity, and returned to normal house temperature afterwards. Feeding 8% DVO diet significantly increased body weight gain (BWG) compared to the other levels of DVO. Moreover, feed conversion ratio (FCR), protein conversion ratio (PCR), metabolizable energy conversion ratio (ECR) and European production efficiency factor (EPEF) were significantly enhanced due to feeding 8% DVO diet compared to 6% DVO diet. On the other hand, 6 and 4% DVO did not significantly differ from the control. Feeding 8% DVO diet significantly decreased plasma low-density lipoprotein (LDL), very-low-density lipoprotein (VLDL) and lymphocytes. Feeding 8% DVO diet significantly increased mean corpscular volume (MCV) and mean corpscularhaemoglobin (MCH) compared to the control. Thus, it can be concluded that broiler chickens fed diet containing 8% DVO have showed tolerance to high ambient temperature (34ºC, 70-75% RH) during the period from 21-42 days old, as evidenced by increasing the productive performance, blood haematological and biochemical traits. [ABSTRACT FROM AUTHOR]