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Articles by Y. Mehmannavaz
Total Records ( 3 ) for Y. Mehmannavaz
  A. Taghizadeh , A. Safamehr , V. Palangi and Y. Mehmannavaz
  In order to determine of metabolizable protein of corn grain (CG), cottonseed meal (CSM), barley grain (BG), alfalfa hay (three cut) (AH), beet pulp (BP), tomato pomace (TP), lupin by products (LBP) and fish meal (FM) using in situ method, this study was carried out. Three fistulatd Gizil whether was used. Data were analyzed using of NAWAY package. Metabolizable protein of CG, CSM, first cut AH, second cut AH, third cut AH, BP, TP, LBP and FM was 3.5098, 23.2197, 4.8509, 6.6067, 6.3770, 6.6207, 4.8044, 6.3005, 16.3847 and 39.6774 g kg 1 DM. The FM and CG had highest and lowest MP, respectively. The results showed that test feed with high crude fiber had low degradability. The degradability of CP of test feeds can be used in MP determination and diet formulation.
  A. Safamehr , A. Azgani and Y. Mehmannavaz
  The aim of the present study was to determine the effects of different levels of l-lysine HCL on performance and carcass characteristics of broiler chickens (Ross-308) from 1-42 days of old. A basal diet according to NRC was formulated. Four graded supplements of lysine as l-lysine HCL (110, 115, 120 and 125% of NRC) were added to the basal diet. Each experimental diet was fed to 80 chickens in a completely randomized design with 4 replicates for each treatment. Weight gain, feed intake and feed conversion ratio of each pen in starter and grower period were compared. Dietary lysine had a significant effect on body weight, feed intake, feed conversion ratio, breast and abdominal fat percentage (p<0.05). Supplementing of l-lysine HCL to starter and grower diets containing the NRC lysine level significantly improved body weight gain and feed intake (p<0.05). Body weight was maximized in birds fed 110% of the NRC recommendations. Feed conversion ratio were optimized by feeding 110% of the NRC Lysine recommendation. The results of this study indicate that increasing dietary lysine up to 110% of the NRC recommendation significantly increased breast yield in male chicks, with no improvement at higher levels and unsexed birds. Quadratic response curves were fitted to growth performance criteria of chicks. The requirement lysine level by segmented regression (plateau) method for body weight gain and feed conversion ratio in starter and grower period were 106.76, 106.8, 107.39 and 107.14, respectively.
  A. Safamehr , N. Aghaei and Y. Mehmannavaz
  This study was conducted to determine effects of different levels of Fish Oil (FO) on performance, carcass and blood parameters on male broiler chickens. Male broiler wee fed isonitrogenous and isoenergetic diets contain 0, 1, 2 and 3% fish oil levels (treatment of 1, 2, 3 and 4, respectively) ad libitum in both starter (11-21 days) and growth periods. The diets met the requirements recommended by the national research council. The final week (42 to 49 days) removed fish oil from diet. At 42 and 49 days of age, blood samples were randomly collected from the wing vein from three birds per pen. The end of both 42 and 49 days also, before slaughtering, the final body weight and after that, weight of selected organs (breast, thighs, liver, heart, gizzard, spleen and abdominal fat) were recorded individually and presented as a percentage of live weight. The results from this research showed that increasing different levels of fish oil had significant effects on male broiler performance (final weight, weight gain and feed convention ratio) (p<0.01), spleen weight (p<0.05), whereas other parameters of performance (feed intake) and carcass did not show significant differences. In serum biochemical parameters, the birds fed 3% FO (T4) indicated highest High-Dencity Lipoproteins (HDL) and lowest Low-Dencity Lipoproteins (LDL) concentrations than control treatment in 42 days (p<0.01). The level highest of glucose (G) observed in T3 (2% FO) in 42 days old (p<0.05). Total protein (P) and albumin (A) concentration in T4 and globulin (GL) concentration in T3 were lowest. With increasing FO levels, cholesterol (CHOL), triglyceride (TG) and Very Low-Dencity Lipoproteins (VLDL) levels showed non significant decrease in collected samples of 42 days. But, decrease of cholesterol level after one week withdrawal of FO from diet, was significant (p<0.05).
 
 
 
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