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Articles by M. Mamouei
Total Records ( 12 ) for M. Mamouei
  H. Roshanfekr , M. Mamouei , K. Mohammadi and E. Rahmatnejad
  In this study, the data of Birth Weight (BW), Weaning Weight (WW) and Daily Gain from birth to weaning (DG) of Arabi lambs were used to estimate of environmental effects, heritability, phenotypic and genetic correlations among these traits. The effect of age of dam on BW was highly significant (p<0.01). The BW of lambs born to 2-year-old ewes in comparison to other lambs born to 3-6 year-old was significantly lighter. The male lambs as compared to the female ones had a heavier BW, WW and DG significantly (p<0.01). A comparison between born single (4.12, 26.21 and 0.252 kg, respectively) and twin lambs (3.55, 23.88 and 0.201 kg, respectively) indicated that the BW, WW and DG of born single lambs were significantly higher (p<0.01). Lambing year had a highly significant effect on the pre-weaning traits (p<0.01). Heritability of BW, WW and DG were 0.121±0.073, 0.095±0.072 and 0.096±0.079, respectively. Phenotypic and genetic correlations between BW-WW, BW-DG and WW-DG were (0.229 and 0.489), (0.119 and 0.429) and (0.987 and 0.999), respectively.
  M. Eslami , M. Baghaei , M. Mamouei , M. Chaji and A. Ashayerizadeh
  This experiment was conducted for comparison the effect of some feed growth promoter additives on serum lipid concentrations of 21 days old broiler chickens. Based a randomized completely design, 300 days old Ross 308 broilers were distributed into 20 floor pens and reared for 21 days. A basal diet was formulated according to NRC recommendations for starter (1-21 days) period. The basal diet was also supplemented with antibiotic (Avilamycin), a commercial composition (FormycinGold), herbal additive (FYTO-MIX) and mixture of FormycinGold plus FYTO-MIX, resulting 5 dietary treatments were prepared including control group. Each dietary treatment was fed ad-libitum to 4 replicates group of 15 birds at the beginning of rearing period. Serum cholesterol and Low Density Lipoprotein (LDL) levels of broiler were fed FYTO-MIX and FormycinGold plus FYTO-MIX was significantly lower than control group (p<0.05). The higher High Density Lipoprotein (HDL) concentration was recorded for birds fed diet supplemented with FormycinGold, FYTO-MIX and FormycinGold plus FYTO-MIX. None of the treatments had significant effect on triglycerides and Very Low Density Lipoprotein (VLDL) levels.
  H. Roshanfekr , M. Mamouei , K. Mohammadi and F. Yarinejad
  A total of 136,250 monthly test day milk records collected from 13,625 Iranian Holstein heifers in Yasuj (three times a day milking) calved between 1997 and 2007 and distributed over 264 herds were used to study the effect of some environmental factors influence lactation curve parameters as well as production characteristics. Wilmink's function (Yt = W0 + W1t + W2e-0.05t) was fitted to individual lactation. Least squares analysis of variance indicated that the herd, year and month calving had a significant effect of all traits under consideration. Correlation analysis showed that the parameters W0 had a negative and significant (p≤0.05) relationship with parameters W1 and W2, while it was positively significantly correlated with milk at peak time and 305 days milk yield. Simple linear regression analysis adjusted means of 305 days milk yield, days to reach peak yield as well as peak milk yield in the first year of calving also revealed that there was a phenotypic increase of 137.152, 0.535 and 0.434 kg year-1, respectively.
  H. Roshanfekr , M. Mamouei , F. Yarinejad and K. Mohammadi
  A total of 136,250 monthly test day milk records collected from 13,625 Iranian Holstein heifers (three times a day milking) calved between 1997 and 2007 and distributed over 264 herds were used to study the effect of some environmental factors influence lactation curve parameters as well as production characteristics. Wilmink's function (Yt = W0 + W1t + W2e-0.05t) was fitted to individual lactation. Least squares analysis of variance indicated that the herd, year and month calving had a significant effect of all traits under consideration. Correlation analysis showed that the parameters W0 had a negative and significant (p≤0.05) relationship with parameters W1 and W2, while it was positively significantly correlated with milk at peak time and 305 day milk yield. Simple linear regression analysis adjusted means of a 305 day milk yield days to reach peak yield as well as peak milk yield in the first year of calving also revealed that there was a phenotypic increase of 137.152 kg, 0.535 day and 0.434 kg per year, respectively.
  M. Chaji , T. Mohammadabadi , M. Mamouei and S. Tabatabaei
  This trial was conducted to determine the effect of high steam (180-210 °C, 3 min) and sodium Hydroxide (NaOH) on fermentative activity and nutritive value of sugarcane pith by in vitro gas production. Experimental samples were including; untreated sugarcane pith, treated with high steam, treated with 50 g kg -1 DM NaOH and treated with steam + NaOH. The results showed sugarcane pith treated with steam + NaOH have the highest potential gas production (B) (143.5 mL). High steam and NaOH caused to increase in vitro cell wall degradation, Organic Matter Digestibility (OMD), Metabolisable Energy (ME) and Short Chain Fatty Acid (SCFA) of sugarcane pith and the highest was for sugarcane pith treated with steam+NaOH (87%, 703.26 g kg -1 OM, 10.03 MJ kg -1 DM and 0.96 μmol L -1, respectively). Therefore, it appears that the degradability and nutritive value of sugarcane pith are influenced by high steam and NaOH.
  H. Roshanfekr , M. Mamouei and M. Bojarpour
  Based on 202 observations, the mean and standard errors values per milking for hind left, hind right, fore right and fore left quarters of lactating Iranian buffaloes were recorded, respectively as 1200±19, 1167±18, 533±16 and 496±16 g for milk yield; 7.21±0.09, 7.21±0.09, 7.11±0.08 and 7.11±0.08% for fat, 9.91±0.06, 9.93±0.05, 9.89±0.04 and 9.90±0.4% SNF; 620±13, 611±12, 509±11 and 491±11 g min-1 for milk flow rate and 122±4, 119±4, 70±3 and 69±3 sec for total milking time under hand milking conditions. The overall let down time was 94±2 sec. The differences between individual quarters between fore pair and hind pair quarters and between right pair and left pair quarters were not significant only for fat and SNF contest, while between the right pair and left pair quarters differences were not significant for any of the parameters. Parity and stage of lactation influenced all the quarter (individual, fore pair vs. hind pair, right pair vs. left pair) parameters with trends similar to those of the same parameters for the whole udder, the time of milking (am or pm) influenced significantly milk yield, rate of flow and SNF content only, which were higher in the morning.
  K. Mohammadi , M. Mamouei , M. Bojarpour , Kh. Mirzadeh and A. Aghaei
  The aim of the present study was to estimate variance components and genetic parameters for post-weaning growth traits of 2634 Zandi lambs from 202 sires and 1093 dams for 6 Month Weight (6MW) of 1893 lambs from 188 sires and 816 dams for 9 Month Weight (9MW) and of 1115 lambs from 156 sires and 514 dams for Yearling Weight (YW). Data and pedigree information used in this study were collected from Khojir Research Station (Tehran-Iran) during 1993-2008. Genetic parameters were carried out by Restricted Maximum Likelihood (REML) method, under six different single-trait animal models. Log likelihood ratio test indicated the most appropriate model for 6MW should included direct additive genetic effects as well as maternal permanent environmental effects whilst the most appropriate model for 9MW and YW had only the direct additive genetic effects. The effects of lamb’s sex, dam’s age and birth year were highly significant on all three traits (p<0.01) but birth type was only significant effect on 6 MW (p<0.05) and was no significant effect on 9MW and YW (p>0.05). Average weights were 27.55±0.09, 32.67±0.11 and 34.92±0.16 kg for 6MW, 9MW and YW, respectively. Estimates of direct heritability (h2) were 0.132, 0.134 and 0.133 for 6MW, 9MW and YW, respectively. The estimate of maternal permanent environmental variance as a proportion of phenotypic variance (c2) was 0.056 for 6MW.
  H. Albomohsen , M. Mamouei , S. Tabatabaei and J. Fayazi
  Metabolic changes in blood serum may be reflected in the biochemical composition of follicular fluid and can be indirectly influenced oocyte quality. The purpose of this study was to investigation metabolite composition variations of follicular fluid and blood serum in Iranian dromedary camels during the peak breeding season (October-march). Following slaughter, blood samples were collected from 50 female camels and follicular fluid aspirated from small (5-9 mm) and large (10-20 mm) follicles were analyzed for various metabolite concentrations, using the commercial kits.
  H. Roshanfekr , M. Mamouei , K. Mohammadi and E. Rahmatnejad
  In this study, the data of Birth Weight (BW), Weaning Weight (WW) and Average Daily Gain from birth to weaning (ADG) of Arabi lambs were used to estimate of environmental effects, heritability, phenotypic and genetic correlations among these traits. The parameters were estimated using derivative free restricted maximum likelihood methods by excluding or including maternal genetic or maternal permanent environmental effects to optimize the model for each trait. Influencing factors such as type of birth, year of birth, lamb’s sex and age of dam were investigated as the fixed effects for models. The results showed that year of birth, type of birth, lamb’s sex and age of dam were highly significant sources of variation on mentioned traits (p<0.001). On the basis of log likelihood ratio test results, model 1 which included direct genetic effects only was determined to be the most appropriate model for above traits. Direct genetic heritability of BW, WW and DG were 0.12±0.07, 0.10±0.07 and 0.10±0.08, respectively. Phenotypic and genetic correlations between BW-WW, BW-ADG and WW-ADG were 0.23 and 0.49, 0.12 and 0.43 and 0.67 and 0.89, respectively.
  E. Rahmatnejad , M. Bojarpour , M. Islami , J. Fayazi and M. Mamouei
  This experiment was conducted to study economic value of Dried Tomato Pomace (DTP) in broiler chickens diets in the form of completely randomized design. For this purpose, 160 days old Ross 308 broilers were distributed into 16 floor pens and reared for 42 days. A basal diet was formulated according to NRC recommendations for starter (0-21 days) and grower (22-42 days) periods. Then, the basal diet was also, supplemented with 8, 16 and 24% DTP, resulting 4 dietary treatments were prepared including control group. The results showed that feed conversion ratio between treatments containing 8 and 16% of DTP compared to control group had no significant difference (p>0.05), but the highest (worst) feed conversion ratio were recorded for birds fed diets supplemented with 24% DTP (p<0.05). Comparison of the cost for 1 kg meat showed that the use of DTP up to 16% in diet reduce production cost.
  H.A. Tavasoli , M. Eslami , M. Mamouei , M. Chaji and M. Bojarpour
  This experiment was conducted to evaluation the effect of different levels of brown seaweed (Ascophyllum nodosum) or Tasco on carcass characteristics of Arabic lambs in Khuzestan, Iran. This research was conducted as completely randomized design with 3 treatments, 3 replicates and 3 lambs in each replicates. The dietary treatments were formulated according to NRC and containing: control 0, 1 and 2% Tasco. The basic diet includes 16.5% crud protein and 76.6% TDN and Tasco was added top-dress to basic diet. The period of experiment was 10 weeks; Twenty-seven male Arabic lambs (3 months old and 16.09±0.33 kg body weight) were assigned ad libitum to experimental diets. Supplementation of diets with Tasco resulted in decrease of tail-fat percentage (23%) and increased percentage of thigh (12.3%) than control (p<0.05) but adding Tasco had no significant effect on other parameters of carcass characteristics (p>0.05). Also, lambs fed diet contain 2% Tasco in comparison to control, had higher Hot Carcass Weight (HCW) (18.62 vs. 18.47 kg, respectively), Cold Carcass Weight (CCW) (18.20 vs. 17.83 kg, respectively) and Eye Muscle Area (EMA) (19.37 vs. 16.83 cm2, respectively). Meanwhile, supplementation of Tasco in diets decreased abdominal fat weight than those fed no seaweed (0.420, 0.300 and 0.250, respectively).
  M. Lotfi Farokhad , M. T. Beigi Nassiri , H. Roshanfekr , J. Fayazi and M. Mamouei
  Data and pedigree information of Arman lambs breed were collected in Abbas-Abad sheep breeding station, Mashhad, Iran by separating direct genetic, maternal genetic and maternal permanent environmental effects during 1997-2008. Genetic parameters of Birth Weight (BW), Weaning Weight (WW) and 6 Months Weight (6 MW) were estimated using mixed animal models of DFREML computer software. For all traits, the fix effects were lamb’s sex, birth type, age of dam and birth year and the random effects were direct additive genetic, maternal additive genetic, maternal permanent environment and maternal common environment. Six different models of analysis were fitted into each trait by ignoring or including maternal genetic effects or common environmental effects. Most appropriate model for each trait was determined by likelihood ratio test. The test indicate that models including direct and maternal genetic effect, without covariance between them was the most appropriate model for BW and WW and the model including effects common environmental due to dam was the most appropriate model for 6 MW. Direct heritability values of 0.094, 0.101 and 0.145 were estimates for BW, WW and 6 MW, respectively. Maternal heritability for birth and weaning weights 0.173 and 0.112 was estimated, respectively. The effect of permanent environmental due to dam for 6 months weight was estimated 0.089. The results generally show that considering effect of maternal in animal models are necessary for correct estimating direct heritability of growth trait of lambs.
 
 
 
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