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Articles by H. Roshanfekr
Total Records ( 25 ) for H. Roshanfekr
  M. Shakeri , H. Roshanfekr , M. Mamoei and Kh. Mirzadeh
  The present research studied the effect of the interval between animal`s death and sperm recovery (0, 24 or 48h) on the quality and freezability of ram spermatozoa from cauda epididymidis. Storage temperature of epididymes (room temperature or 5°C) was also analyzed. Spermatozoa were diluted with Tes-Tris-Fructose solution supplemented with egg yolk (10%) and glycerol (4%) and frozen using a programmable bio-freezer (-20°C min-1). Pre-freeze and post-thaw sperm samples showed viable spermatozoa up to 48h after the animal`s death, although their quality declined significantly as post-mortem storage time increased. Epididymes sperm stored at 5°C showed better motility and a lower percentage of abnormal forms than epididymes stored at room temperature after 24 and 48h. The fertilizing ability of cauda epididymis ram spermatozoa obtained at 0 and 24h after the animal`s death is similar to that of ejaculated spermatozoa. Therefore, a good protocol for post-mortem semen collection in rams when epididymal spermatozoa cannot be collected immediately is to preserve the epididymes at 5°C and process the samples in the first 24h after the animal`s death.
  N. Dabiri , A. Ashayerizadeh , O. Ashayerizadeh , K.H. Mirzadeh , H. Roshanfekr , M. Bojarpour and M.R. Ghorbani
  This study was conducted for comparison the effect of some feed growth promoter additives on performance and gut microflora population of 21 days old broiler chickens. Based on randomized completely design, 300 days old Ross 308 broilers were distributed into 30 floor pens and reared for 21 days. The basal diet was also supplemented with Flavomycin, Primalac, Biolex-MB and mixture of Primalac plus Biolex-MB, resulting 5 dietary treatments were prepared including control group. Each dietary treatment was fed ad-libitum to 6 replicate group of 10 bird at the bigining of rearing period. The result of experiment indicate that diets containing growth promoters improved broilers performance. This improvement was only significant (p<0.05) between control group and both Biolex-MB and synbiotic treatment groups, for body weight gain and between control group and 3 bird groups fed Flavomycin, Biolex-MB and synbiotic dietary treatments for feed conversion raito. Compared with control birds group, all other treatment groups fed growth promoter diets had relatively lower total bacterial population in crop except for Primalac treatment, but this differences was significant (p<0.05) only between Flavomycin and control group treatments. Birds fed diets containing growth promoter had greater lactic acid bacteria populations in crop compared with control group, but this priority was significant (p<0.05) only for synbiotic group. A reversed trend were found for coliforms population in ileum, where all growth promoter groups, except Flavomycin, had significantly (p<0.05) lower population compared with control group. Additionally, such feed additives altered the pH content of crop and ileum.
  E. Rahmatnejad , H. Roshanfekr , O. Ashayerizadeh , M. Mamooee and A. Ashayerizadeh
  This experiment was conducted to evaluation the effects of Prebiotic, Garlic powder and Turmeric powder on performance and carcass characteristics of broiler chickens. Based a randomized completely design, 240 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. The basal diet was also supplemented with prebiotic Biolex-MB, garlic powder and turmeric powder, resulting 4 dietary treatments were prepared including control group. Each dietary treatment was fed ad-libitum to 4 replicates group of 15 birds at the bigining of rearing period. The result of present study indicated that the diets containing feed additives had no significant effect on broilers performance with an except of Biolex-MB, which improved weight gain and feed conversion ratio (p<0.05). Supplementation of biolex-MB in diet significantly (p<0.05) affected the amount of carcass, thigh and breast (p<0.05). The highest percent of carcass and thigh were found in biolex-MB and control bird groups, respectively (p<0.05). The percent of breast was not affected whit feed treatments.
  E. Rahmatnejad , H. Roshanfekr , O. Ashayerizadeh , M. Mamooee and A. Ashayerizadeh
  This experiment was conducted to evaluation the effects of Prebiotic, Garlic powder and Turmeric powder on performance and carcass characteristics of broiler chickens. Based a randomized completely design, 240 day 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. The basal diet was also supplemented with prebiotic Biolex-MB, garlic powder and turmeric powder, resulting 4 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. The result of present study indicated that the diets containing feed additives had no significant effect on broilers performance with an except of Biolex-MB, which improved weight gain and feed conversion ratio (p<0.05). Supplementation of biolex-MB in diet significantly (p<0.05) affected the amount of carcass, thigh and breast (p<0.05). The highest percent of carcass and thigh were found in biolex-MB and control bird groups, respectively (p<0.05). The percent of breast was not affected with feed treatments.
  R. Yaeghoobi , H. Roshanfekr , M. Mamooee , J. Fayazi , A. Ashayerizadeh , M. Bojarpour and M.T. Beigi Nasiri
  This study was carried for investigation interaction between genotype and environment for milk and fat production traits of Holstein cattle in western provinces of Iran. In this study, used 2213 records of first lactation Holstein dairy cattle in this zone of Iran. These data get from Iranian Animal Breeding Center from 1996-2006. The edited sets include 2213 first lactation for milk and fat. Records were divided in two climates. Heritability estimates using REML method and derivative-free algorithm for milk and fat yield in semidry climate and Mediterranean climate 0.2014±0.06 and 0.2468±0.03, respectively. For estimation of Genetic correlation were used from multivariate animal model. Genetic correlation was -0.04 and 0.013 for milk yield and fat yield, respectively. EBVes correlation mean was -0.019 and 0.031 for proofs between climate for milk and fat traits, respectively. Low genetic correlation and EBVes correlation for milk and fat traits between climates Indicate to proofs have not same difference performance in both climates. In addition, Germany Sperms cause increase milk and fat yield in both climate and Iranian and American Sperms decrease milk and fat yield in both climate.
  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.
  S. Sharifi , H. Roshanfekr , S.R. Khatami and K.H. Mirzadeh
  Prolactin is a peptide hormone synthesized by lactotropes of the anterior pituitary. prolactin plays an important regulatory function in milk production and reproduction. Genomic DNA was isolated from blood samples of 84 Najdi cattle. A 156 bp PRL gene exon III segment was amplified by PCR using bovine specific primers. RFLPs in this segment was studied using RsaI restriction enzyme. The frequencies of genotypes were as follows: 0.2857-AA, 0.5714-AB, 0.1429-BB; Frequencies of allele A and B were 0.571 and 0.429 in Najdi Cows.
  Y. Shojaei Tabar , J. Fayazi , H. Roshanfekr , Kh. Mirzadeh and A.S. Sadr
  Prolactin is a polypeptide hormone with multiple functions, secreted mainly by the anterior pituitary gland this experiment conducted to investigate of prolactin polymorphism in buffalo population in Khuzestan of Iran. DNA was isolated from blood samples of 85 buffalos of different areas. In this study, used Polymerase Chain Reaction-Restriction Fragment Length Polymorphism (PCR-RFLP) technique for amplified a 156 fragment consisting of part of exon 3. The amplified fragment digested with RsaI restriction endonuclease and subjected to electrophoretic separation in ethidium bromide-strained 3% agarose gel. All the samples studied comprised of single fragment of 156 bp indicating the monomorphic nature of the locus, showing AA genotype.
  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.
  K. Mohammadi , M.T. Beygi Nassiri , J. Fayazi and H. Roshanfekr
  The study was carried out to investigate the effects of environmental factors on pre-weaning growth traits in Zandi sheep. Data (birth weight, weaning weight and average daily gain from birth to weaning) were collected from lambs that have been born during 1993-2008 in Khojir Research Station (Tehran-Iran) and analyzed using SAS 9.1 software. Birth year, birth type, lamb’s sex and dam’s age were highly significant sources of variation on Birth Weight (BW), Weaning Weight (WW) (p<0.01), whilst lamb’s sex was not significant on Average Daily Gain from birth to weaning (ADG). The interaction effects between birth year and birth type and dam’s age and birth type were significantly affected on these traits (p<0.05). At birth and weaning the male and single lambs were heavier than female and twin lambs. Results that environmental factors have an important role in expressing of genetic potential in the lambs. Average weights were 4.23±0.012, 21.17±0.060 and 0.174±0.00 kg for BW, WW and ADG, respectively.
  K. Mohammadi , M.T. Beygi Nassiri , J. Fayazi and H. Roshanfekr
  The present study was carried out to investigate the effects of environmental factors on pre-weaning growth traits in Zandi sheep. Data (birth weight, weaning weight and average daily gain from birth to weaning) were collected from lambs that have been born during 1993-2008 in Khojir Research Station (Tehran-Iran) and analyzed using SAS 9.1 software. Birth year, birth type, lamb’s sex and dam’s age were highly significant sources of variation on Birth Weight (BW), Weaning Weight (WW) (p<0.01), whilst lamb’s sex was not significant on Average Daily Gain from birth to weaning (ADG). The interaction effects between birth year and birth type and dam’s age and birth type were significantly affected on these traits (p<0.05). At birth and weaning, the male and single lambs were heavier than female and twin lambs. Results showed that environmental factors have an important role in expressing of genetic potential in the lambs. Average weights were 4.23±0.012, 21.17±0.060 and 0.174±0.00 kg for BW, WW and ADG, respectively.
  K. Mohammadi , M.T. Beygi Nassiri , J. Fayazi and H. Roshanfekr
  The present study was carried out to investigate the effects of environmental factors on pre-weaning growth traits in Zandi sheep. Data (birth weight, weaning weight and average daily gain from birth to weaning) were collected from lambs that have been born during 1993-2008 in Khojir Research Station (Tehran-Iran) and analyzed using SAS 9.1 software. Birth year, birth type, lamb ’s sex and dam ’s age were highly significant sources of variation on Birth Weight (BW), Weaning Weight (WW) and Average Daily Gain from birth to weaning (ADG) (p<0.001). The interaction effects between birth year and birth type and dam ’s age and birth type were significantly affected on these traits (p<0.001). At birth and weaning, the male and single lambs were heavier than female and twin lambs. Results showed that environmental factors have an important role in expressing of genetic potential in the lambs. Average weights were 4.23 ±0.012, 21.17 ±0.060 and 0.174 ±0.00 kg for BW, WW and ADG, respectively.
  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.
  A. Rastegari , H. Roshanfekr , M. Mamouie and S.R. Khatami
  Growth Hormone is a peptide hormone synthesized by lactotropes of the anterior pituitary. It is well known that it playes an important role in biological processes such as mammary development, lactation, growth and metabolism regulation, being therefore a promising candidate gene marker for improving milk and meat production in cattle. Genomic DNA was isolated from blood samples of 84 Najdi cattle. A 211 bp GH gene exon IV segment was amplified by PCR using bovine specific primers. RFLP in this segment was studied using Alu1 restriction enzyme. The frequencies of genotypes were as follows, 0.6905 LL, 0.2857 LV, 0.2380 VV, frequencies of allele L and V were 0.8333 and 0.1667 in Najdi cows.
  K. Mohammadi , M.T. Beigi Nassiri , J. Fayazi , H. Roshanfekr and A. Aghaei
  Genetic parameters and (co) variance components were estimated on 2445 lambs from 139 sires and 804 dams for Birth Weight (BW) on 2237 lambs from 127 sires and 784 dams for Weaning Weight (WW) and on 2098 lambs from 115 sires and 739 dams for Average Daily Gain (ADG). The data collected from Animal Science Research Station of Agricultural and Natural Resources Ramin (Khuzestan) University during 2001-2008. Analyses were carried out by Restricted Maximum Likelihood (REML) method. Six different animal models including or ignoring maternal genetic or permanent environmental effects were fitted for traits. The Model 3 with only maternal additive effects seemed most suitable. Influencing factors such as birth year, birth type, lamb’s sex and dam’s age were investigated as the fixed effects for the models. Estimates of direct heritability from model 3 were 0.194 for birth weight, 0.163 and 0.149 for weaning weight and average daily gain, respectively. Maternal heritability estimates for birth weight, weaning weights and average daily gain were 0.15, 0.11 and 0.09, respectively. For these traits, correlation estimates between direct additive and maternal genetic (ram) effects were high and negative ranging from -0.57 to 0.93. Bivariate analysis by Model 3 was also used to estimate genetic correlations between traits. The estimates of genetic, phenotypic and environmental correlations among traits were positive and intermediate to high in value. The results indicate that in addition to additive direct effect, additive maternal effect for all traits was important.
  S. Rahimnahal , J. Fayazi , Kh. Mirzadeh , M.T. Beigi Nassiry and H. Roshanfekr
  The Bovine Lymphocyte Antigen (BoLA-DRB3) gene encodes cell surface glycoproteins that initiate immune responses by presenting processed antigenic peptides to CD4 T helper cells. DRB3 is the most polymorphic bovine MHC class II gene which encodes the peptide-binding groove. Since different alleles favor the binding of different peptides, DRB3 has been extensively evaluated as a candidate marker for associations with various bovine diseases and immunological traits. Therefore in this study, the genetic diversity of the bovine class II DRB3 locus in the buffalo population in Khouzestan Province of Iran investigated by Polymerase Chain Reaction-Restriction Fragment Length Polymorphism method (PCR-RFLP). Buffalo DNA isolated from whole blood. A hemi-nested PCR followed by digestion with restriction endonucleases Hae III conducted on the DNA.
  K. Mohammadi , M.T. Beigi Nassiri , H. Roshanfekr , K. Mirzadeh and A. Aghaei
  Data from body weights at post-weaning were used to genetic trend for Zandi sheep reared in Khojir breeding station of Tehran-Iran over a 16 years period (1993-2008) using animal model for lambs, rams and ewes. Genetic trends were estimated for 6 Months Weight (6MW), 9 Months Weight (9MW) and Yearling Weight (YW) traits. For investigation of each trait appropriate models using 3-trait analysis were applied. Breeding values of animals were predicted by Best Linear Unbiased Prediction (BLUP) methodology under three-trait animal models. Genetic trends of studied traits were estimated by regressing mean of breeding values on birth year. The genetic trends were positive and significant for 6MW, 9MW and YW and were 21, 72 and 65 g year-1, respectively.
  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.
  A. Ashayerizadeh , N. Dabiri , O. Ashayerizadeh , K.H. Mirzadeh , H. Roshanfekr and M. Mamooee
  This experiment was conducted for comparison the effects of antibiotic (flavomycin), probiotic (primalac), prebiotic (Biolex-MB) and mixture of probiotic and prebiotic (primalac plus Biolex-MB) as dietary growth promoter on growth performance, carcasscharacteristics and hematological indices of broiler chickens. Three hundred day old Ross 308 broilers were equally distributed into 30 floor pens and reared for 42 day. A basal diet was formulated covering the recommendations of NRC (1994) for starter (0-21 days) and grower (22-42 days) periods and considered as control diet. Four tested diets were formulated by supplemented the basal control diet with antibiotic (flavomycin), probiotic (primalac), prebiotic (Biolex-MB) and mixture of primalac plus Biolex-MB, respectively. Six replicates were used for each treatment. The results of present study showed that all growth promoters used was improved growth indices of Ross 308 broilers. The highest significant (p<0.05) values of carcass and thigh were recorded for broilers fed diet supplemented with flavomycin. The highest (p>0.05) value of breast was recorded for broilers fed the diet supplemented with primalac, meanwhile the lower value were showed for birds fed either diet or diet supplemented with Biolex-MB. The percent of carcass and cuts followed the same trend. Hematological parameter including cholesterol was recorded the highest (p>0.05) values groups fed the diets either control or supplemented with flavomycin, meanwhile the lower value was showed for bird fed diet supplemented primalac plus Biolex-MB. Triglycerides and very low density lipoprotein cholesterol (VLDL) were recorded the highest concentration for bird fed both control and diet supplemented with flavomycin groups while least concentration was found for bird fed diet supplemented with primalac. The results of present study revealed that probiotic and prebiotic as growth promoters can use as alternatives non-antibiotic feed additives to their free harmful side effects on the consumers and to improve broiler chickens growth indices.
  K.H. Heydari , N. Dabiri , J. Fayazi and H. Roshanfekr
  This experiment was conducted to investigate the effect of ionophores monensin and lasalocid on performance and carcass characteristics in fattening Arabi lambs. Thirty fattening male lambs with similar conditions (22.14±0.72 kg body weight) were included in this experiment from day 90 until day 150. Three high concentrate diets containing with 30 ppm monensin (M), 30 ppm lasalocid (L) and none additive (Control = C) were offered to lambs in a completely random design. The Body Live Weight (BLW), Average Daily Gain (ADG), Dry Matter Intake (DMI) and Feed Conversion Ratio (FCR) of lambs were measured two weeks interval until eight weeks. Carcass components were recorded at the end of trial. Total ADG and final BLW of fattening lambs fed the diets containing ionophores were significantly higher (p<0.05) than lambs fed the control diet. DMI of the lambs fed diet containing monensin were significantly lower (p<0.05) than other two groups. The same trend was found for FCR, while the differences was significant (p<0.05) only between M and C group lambs. Carcass characteristics was not affected by treatment (p>0.05), but lambs fed diet containing lasalocid had greater dressing (%) and boneless meat (%). It is concluded that the performance and carcass characteristics were improved in diets containing ionophores.
  M. Baghaei , A. Ashayerizadeh , M. Eslami , M. Bojarpour , H. Roshanfekr and K.H. Mirzadeh
  An in vivo experiment was conducted to determine the effect of dietary betaine supplementation as a replacement for methionine on broiler performance and carcass characteristics. Three hundred day old Ross 308 broilers were used in a randomized completely design with 4 treatment and 5 replicates in each treatment and 15 birds/replicates and reared on the floor pens for 42 days. A basal diet was formulated as control according to NRC, recommendations for starter (1-21 days) and grower (22-42 days) periods. In experimental diets, methionine levels were as formulated (control (T1)) and at 90 (T2), 80 (T3) and 70% (T4) of the control. The incompleted levels of the methionine in T2, T3 and T4 supplemented by adding Betafin to the diets. The result of present study indicated that feed intake was no affected by treatments (p>0.05). The birds under T2 and T4 had lower body weight gain during 1-42 days as compared with control group. Also, the using of T4 in both of 22-42 and 1-42 days and T2 in 1-42 days significantly resulted to undesirable feed conversion ratio (p<0.05). Supplementation levels of betafin in diets no significantly (p<0.05) affected the amount of carcass and its cuts (p>0.05), except the percent of thigh was significantly higher than control group (p<0.05).
  A. Heydari , M. Eslami , H. Roshanfekr , M. Bojarpur and M.R. Ghorbani
  An experiment was conducted to evaluate the effects of different levels of Calcium Soap Unsaturated Fatty Acids (CSUFA), with supplemental α-tocopheryl acetate (α-Toc) on laying hen’s performance and egg yolk cholesterol. Ninty six Leghorn hens (Hy-Line), from 38-46 weeks of age were used in a 2x3 factorial arrangement with tow levels of vitamin E (0 or 1000 mg kg-1 of diets) and three levels of CSUFA (0, 2 and 4% of diets) in a completely randomized design with six treatments and four replicates and four hens per replicate. Feed Intake (FI), Egg Production (EP), Egg Weight (EW), Yolk Weight (YW), Shell Thickness (ST), Haugh Unit (HU), Yolk Cholesterol (YC) and Feed Conversion Ratio (FCR) were measured. The result of this experiment indicated that EW, YW, FI, FCR were significantly (p<0.05) affected by fat levels. FI and FCR were decreased with fat levels from 0-4%. Different levels of dietary vitamin E had no significant effect on FI, EP, FCR, EW, YW, ST, HU and YC (p>0.05).
  A. Heydari , M. Eslami , H. Roshanfekr , M. Bojarpur and M.R. Ghorbani
  An experiment was conducted to evaluate the effects of different levels of Calcium Soap Unsaturated Fatty Acids (CSUFA), with supplemental α-Tocopheryl acetate (α-Toc) on laying hen’s performance and egg yolk cholesterol. About 96 Leghorn hens (Hy-Line), from 38-46 weeks of age were used in a 2x3 factorial arrangement with tow levels of vitamin E (0 or 1000 mg kg-1 of diets) and three levels of CSUFA (0, 2 and 4% of diets) in a completely randomized design with six treatments and four replicates and four hens per replicate. Feed Intake (FI), Egg Production (EP), Egg Weight (EW), Yolk Weight (YW), Shell Thickness (ST), Haugh Unit (HU), Yolk Cholesterol (YC) and Feed Conversion Ratio (FCR) were measured. The result of this experiment indicated that EW, YW, FI, FCR were significantly (p<0.05) affected by fat levels. FI and FCR were decreased with fat levels from 0-4%. Different levels of dietary vitamin E had no significant effect on FI, EP, FCR, EW, YW, ST, HU and YC (p>0.05).
  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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