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Articles by A. Nobakht
Total Records ( 6 ) for A. Nobakht
  A. Nobakht , M. Shivazad , M. Chamany and A.R. Safameher
  This study was conducted to determine the effects of different dietary electrolyte balance on performance and eggshell quality of laying hens in heat stress condition. four diets were formulated using different inclusions of NaCl, NaHCO3, KHCO3 and NH4Cl to give the dietary electrolyte (DEB) as 0, 120, 240 and 360 mEq/kg, and fed to laying hens from 55 weeks to 65 weeks of age exposed to heat - stress environment. Egg production, feed intake, water consumption, egg mass and feed conversion ratio were not significantly affected by the diets of various DEB (P>0.05). Among egg parameters shell weight/surface area, shell weight, shell thickness and egg specific gravity were significantly affected by DEB (P< 0.01). In conclusion, increasing dietary electrolyte balance to 360 mEq/kg in laying hens rations under heat stress condition in late period of production can improve egg quality.
  A.R. Safameher and A. Nobakht
  This study was designed to evaluate the effects of Dietary Electrolyte Balance (DEB = Na+ + K+- Cl-) on the performance and eggshell quality of layers in their late laying period. Two hundred fifty six Hy-Line strain laying hens, 55-65 of age, were randomly assigned to 4 dietary treatments. The DEB levels were 0, 120, 240 and 360 mEq kg 1 and were obtained by addition of NaCl, NaHCO3, KHCO3 and NH4CL as needed. Egg production, feed intake, egg mass and Feed Conversion Ratio (FCR) were not significantly affected by any of the treatments, whereas eggshell quality was significantly affected (p< 0.05). The shell thickness were increased with increasing DEB from 120-360 mEq kg 1 relative to the control diet. It was concluded that high rate DEB (360 mEq kg 1) can improve eggshell quality in the late laying period.
  A. Nobakht , M. Shivazad , M. Chamany and A.R. Safameher
  This study was designed to evaluate the effects of Dietary Electrolyte Balance (DEB = Na+ + K+-Cl-) on the performance and eggshell quality of layers in their early laying period. Two hundred fifty six Hy-Line strain laying hens, 24-34 weeks of age, were randomly assigned into four treatment. The DEB levels were 0, 120, 240 and 360 mEq kg 1 and were obtained by addition of NaCl, NaHCO3, KHCO3 and NH4CL as needed. Egg production, feed intake, egg mass and Feed Conversion Ratio (FCR) were not significantly affected by any of the treatments, whereas eggshell quality was significantly affected (p< 0.05). The shell specific gravity, shell weight, shell thickness, shell ash and shell weight/surface area were increased with increasing DEB from 120-360 mEq kg 1 relative to the control diet. It was concluded that high rate DEB (360 mEq kg 1) can improve eggshell quality in the early laying period.
  A. Nobakht and A.R. Safamehr
  This study was designed to evaluate the effects of inclusion different levels of DTP pomace in laying hens diets on performance and serum and egg yolk cholesterol contents. One hundred eighty two Hy-Line strain laying hens, 65-73 weeks of age, were randomly assigned to 4 dietary treatments. The levels of DTP Inclusion were 0, 5, 7.5 and 10% and fed to laying hens for 8 week. Egg production, egg weight, egg mass and eggshell weight were significantly affected by inclusion of DTP in treatments. Whereas serum and egg yolk cholesterol content were not significantly affected (p< 0.05). It was concluded that DTP can be used as an alternative feedstuff in laying hens diets, at inclusion levels up to 10% without negative effects on performance and egg quality.
  A. Nobakht
  This study was designed to evaluate the effects of inclusion different levels of rice bran in laying hens diets on performance and serum and egg yolk cholesterol contents. Two hundred and fifty six Hy-Line strain laying hens, 65-73 weeks of age, were randomly assigned to 4 dietary treatments. The levels of rice bran Inclusion were 0, 5, 7.5 and 10% and fed to laying hens for 8 week. Egg production, feed efficiency and egg mass were significantly affected by inclusion of rice bran in treatments. Whereas egg quality and plasma and egg yolk cholesterol content were not significantly affected (p< 0.05). It was concluded that rice bran can be used as an alternative feedstuff in laying hens diets, at inclusion levels up to 7.5% without negative effects on performance and egg quality.
  R. Omidbaigi and A. Nobakht
  The ripe fruit of milk thistle (Silybum marianum L. Gaerth) contain flavonoids that are used to prepare anti - hepatotoxic drugs. This plant is important to pharmaceutical industries. The main aim of this investigation was to study the influence of nitrogen fertilizer on growth, seed yield and active substances (silymarin and silybin) content of milk thistle. The results showed that nitrogen fertilizer had significant effect on growth (plant height, number of capitula per plant, capitula diameter), seed yield, silymarin and silybin content. The highest seed yield (2.35 kg/plot) was obtained from the plots, receiving 200kg / ha N as top dressing after seed germination. But the highest silymarin (9.25%) and silybin (33. 58%) content was accumulated in the seeds of control treatment plants.
 
 
 
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