فهرس المقالات temperature humidity index

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  1 - Effect of Protein Levels and Rumen Protected Glutamine Supplementation on Blood Metabolites, Thyroid Hormones, and Redox Status of Heat Stressed Fattening Lambs
  M. Feyz A. Teimouri Yansari Y. Chashnidel E. Dirandeh
  High ambient temperatures have a negative effect on the production and health of animals. Severe heat stress may lead to changes in the secretion of hypothalamus and pituitary gland hormones, which alter hormonal responses and metabolism. The aim of this study was to de أکثر

  High ambient temperatures have a negative effect on the production and health of animals. Severe heat stress may lead to changes in the secretion of hypothalamus and pituitary gland hormones, which alter hormonal responses and metabolism. The aim of this study was to determine the effect of protein levels and rumen protected glutamine supplementation on blood metabolites, thyroid hormones concentrations, and redox status of fattening heat stressed lambs. Using sixteen Afshari male lambs (aged 3-4 months) over 45 days, a 2 × 2 factorial were designed to study the effects of two levels of protein (equal and 10% higher than requirement) and glutamine (0.0 and 0.2 g/kg body weight) in four experimental rations. Results showed the glutamine supplementation increased triiodothyronine and thyroxine concentrations; and conversely decreased aspartate transaminase, non-esterified fatty acids, and cortisol concentrations. Increased protein levels at the beginning of fattening did not affect triiodothyronine, thyroxine, aspartate transaminase, alanine transaminase, and non-esterified fatty acids concentrations. Interaction of glutamine and protein levels significantly decreased cortisol concentrations. Glutamine supplementation increased levels of superoxide dismutase and glutathione peroxidase, and decreased nitric oxide. The greater protein levels significantly decreased superoxide dismutase and glutathione peroxidase on day 30, total antioxidant status concentration on day 15 and 45, and increased nitric oxide concentration on day 15 of fattening. It can be concluded that glutamine supplementation improves redox status of heat stressed lambs during the fattening period but increase protein levels alone did not have this effect. تفاصيل المقالة
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  2 - Blood Biochemical Parameters and Physiological Indices in Fattened Heat Stressed Lambs Fed with Higher Protein Level and Glutamine Supplementation
  M. Feyz A. Teimouri Yansari Y. Chashnidel E. Dirandeh
  The research aims to determine the effect of protein levels and glutamine supplementation on the blood biochemical parameters and physiological indices of fattened lambs during heat stress. Sixteen male lambs of the Afshari breed (average BW=31.5±0.22 kg; aged 3- أکثر

  The research aims to determine the effect of protein levels and glutamine supplementation on the blood biochemical parameters and physiological indices of fattened lambs during heat stress. Sixteen male lambs of the Afshari breed (average BW=31.5±0.22 kg; aged 3-4 months) were randomly selected and assigned into four groups for forty-five days. The experimental treatments included animals fed with a basal diet (C), basal diet supplemented with glutamine at the rate of 0.2 g/kg of body weight (BW) (G), basal diet with 10% higher protein (CP), and basal diet with 10% higher protein and glutamine (GP). The mean temperature-humidity index was 82.26, which indicated heat stress condition during the experimental periods. Changes in body weight, dry matter intake, and feed conversion ratio were similar in all the groups. Rectal temperature and respiratory rate significantly decreased with glutamine supplementation (P=0.018, P=0.004 and P=0.051, P=0.004 on the 30th and 45th days respectively). Glutamine supplementation in G and GP groups decreased concentrations of creatinine (P=0.013 on the 30th), lactate (P<0.0001 on the 15th day) and conversely increased glucose concentration (P=0.027, P=0.012 and P=0.001 on the 15th, 30th and 45th days), but the effect of glutamine supplementation on blood urea nitrogen, cholesterol, and triglycerides was not significant. The significantly increased blood urea nitrogen, cholesterol (P<0.05) and triglycerides (P=0.001, P=0.019 on the 15th and 30th) when the higher level of protein was used; however, glucose, creatinine, and lactate were found non significant. The interaction of glutamine and protein level significantly increased glucose concentration (P=0.010 and P=0.005 on the 15th and 45th days) and decreased cholesterol and triglyceride concentrations in fattening lambs (P<0.05). The results showed that glutamine supplementation improves the health state of heat-stressed lambs during the fattening period. تفاصيل المقالة