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Articles by J. Fayazi
Total Records ( 23 ) for J. Fayazi
  O. Ahmadauli , M. Eslami and J. Fayazi
  The aim of this study was to investigate the effects the addition of multi enzyme preparation and the replacement value of canola meal (CM) for soybean meal (SBM) on performance broiler chickens. A total of 384 (Ros-308) day-old broiler chicks were allotted randomly to 8 dietary treatments each in 4 replicates of 12 birds per pen. The 2 enzyme levels (0 and 500 gr/ton) and the 4 CM levels (0, 20, 30 and 40) were used in 2 x 4 factorial arrangements in isoenergetic and isonitrogenous diets. The experiment lasted for 42 d and a single mash diet was used throughout the experiment. The body weight (BW) gain and feed consumption were significantly (P < 0.01) reduced when levels of CM from 20 to 40% and feed-gain ratio was depressed (P < 0.01). A depression in breast weight was observed in birds that were fed the added from CM. Adding levels of CM from 20 to 30% significantly (P < 0.01) decreased leg weight. Gizzard weight as percentage on carcass weight increased linearly (P < 0.05) with the addition levels of CM from 30 to 40%. The addition of enzyme numerically improved BW gain at 1-21 and 1-42 days and also improved carcass weight and breast weight, but effects were not significant (P > 0.05). The interaction between CM and enzyme for total performance parameter at this experiment were not significant. These results showed that CM can be used in place of 20% of the SBM.
  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.
  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.
  M. Nazari , M.T. Beigi Nassiri , J. Fayazi and S. Tabatabaei
  In order to estimate variance components 8843 test day milk and fat yields records from first lactation Najdi cattle were used. Data obtained between years of 1989-2005 by animal breeding station of Najdi cattle located in Shooshtar city. Random regression models were studied in respect of different orders of fitting for fixed and random regression. Also, different methods of residual variance in the statistical model assume that included assumption of constant residual variance and different assumption about variable residual variance during lactation. According to the obtained results, the assumption of heterogeneous residual variance during lactation improved characteristics of statistical model. A suitable model with (3, 3) orders of fit for additive genetic and permanent environmental covariance functions to analyze TD fat and milk yield records were recognized. Minimum of heritability for fat and milk yield was estimated at the beginning of lactation (0.1, 0.15), respectively. The amount of this parameter increased to mid lactation and almost in the 5th month of lactation reached to maximum level (0.34 for milk yield and 0.44 for fat yield), then decreased to the end of lactation.

Key words: Random regression, milk and fat yields, Najdi cattle, residual variance, Iran

  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.
  S.M.R. Hossaini , M. Bojarpour , M. Mamouei , A. Asadian and J. Fayazi
  The effects of probiotic and antibiotic administration were studied in an experiment, using 24 newborn calves. Calves were randomly assigned to three experimental groups (eight calves for each group). Probiotic (2 g day-1) and antibiotic (2 g day-1) was added in their daily milk intake until age of weaning. After the 3 days, all calves (including control group) received starter ration containing 21.540% crude protein and 2.75 Mcal kg-1 energy. Feed intake, Body weight gain, Fecal scores and general health condition of all calves were observed at per week. Also condition of feces was examined daily and the occurrence of diarrhea was recorded throughout the experiment. Mean values of weight gain during tow months for treatments probiotic, antibiotic and control groups were 36.75, 35.41 and 31.83 kg, respectively. DMI illustrated that calves fed antibiotic (T2) thorough had greater DMI than control calves (p<0.05). Body weight gained was not significantly different for first and second months between treatments probiotic, antibiotic and control groups (11.750 and 25, 12.91 and 22.5 versus 11 and 20.75 for fist and second months in treatments and control groups, respectively). When the entire study period, calves fed probiotic (T1) and antibiotic (T2) had greater BWG (p<0.05) than control calves, also calves fed probiotic (T1) and antibiotic (T2) had greater ADG (p<0.05) than control calves. The results of this study indicated that present probiotic compound have beneficial effects, especially on the 2 months of age in rearing calves.
  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.
  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.
  M. Borazjanizadeh , M. Eslami , M. Bojarpour , M. Chaji and J. Fayazi
  This study was conducted to evaluate economic value of clove and oregano cultivated in Iran on economic value of broiler chickens diets. About 271 day old Ross strain broiler chickens were allocated to 9 experimental diets with 3 replications in a 3x3 factorial experiment. Treatments were 0, 0.5 and 1% of clove and oregano (AH) that used as top-dress. A basal diet was formulated according to NRC recommendation for grower (14-21 days) and finisher (21-42) periods. The results showed that clove and oregano had significant effects on feed intake, feed conversion ratio and the cost of 1 kg feed and cost of 1 kg meat production (p<0.05).
  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.
  F. Salabi , M. Boujarpoor , J. Fayazi , S. Salari and M. Nazari
  About 288, 1day old Ross 308 broiler were used to evaluate the effect of zinc on performance and carcass characteristics of broiler during Heat Stress (HS). Broilers raised in either a thermoneutral (TN, 23.9°C constant) or HS (23.9-35°C cycling) environment were fed an adequate zinc diet (45 mg kg-1) and high zinc diets (90 and 135 mg kg-1), accomplished by adding a zinc from ZnSO4.7H2O to the ration. The HS birds consumed less feed, gained less weight and had lower feed efficiency when compared to TN birds. Dietary zinc levels did significantly influence broiler growth performance. Lymphoid organs, breast and leg meat yield and liver weights were all reduced by HS. These results indicate that the performance, carcass characteristics of broiler and immune response of broilers can be influenced by the level of zinc in the diet and by environmental conditions.
  J. Fayazi , M. Moradi , G. Rahimi , R. Ashtyani and H. Galledari
  This study was conducted to evaluate the genetic structure of B. xanthopterus populations in Karoon, Krkhe and Jrahi rivers in southwest of Iran using Polymerase Chain Reaction (PCR) and Restriction Fragment Length Polymorphism (RFLP) analysis of mitochondrial DNA (mtDNA). Amplified mtDNA (cytochrome b and part of tRNAGlu) genes were digested with nine restriction enzymes in order to check the presence of recognition sites. RFLP analysis revealed a total of nine composite haplotypes in 100 individuals. The estimated sequence divergence between all pairs of haplotypes ranged from 0.8 to 4.4%. The haplotype and nucleotide diversity within populations ranged from 0.3785 to 0.6456 and 0.0052 to 0.0125, respectively. The average nucleotide diversity (πxy) and the net nucleotide divergence (δ) among 3 populations ranged from 0.0108 to 0.0127 and 0.00 to 0.39%, respectively. The neighbour-joining dendrogram which was constructed based on the net nucleotide sequence divergence showed that B. xanthopterus populations separated in two groups. The B. xanthopterus populations in Karoon and Krkhe rivers are categorized in one group and Jrahi river in a second group. The obtained phylogenetic relationships was approved by Fitch-Margoliash method using Slatkin linearized FSTs. The obtained results at the present study showed a low genetic diversity between B. xanthopterus of Karoon, Krkhe and Jrahi rivers in southwest of Iran. The results also suggested that for maintaining of genetic diversity of B. xanthopterus at appropriate levels, the exchange and transfer of Barbus stocking between Jrahi and other river basin should be avoided.
  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.
  R. Ebrahimi , M. Eslami , J. Fayazi and M.F. Jahromi
  This experiment was done to evaluate the potential use of steam treated bagasse pith (SPB) in feeding of Lori Ewes. Forty eight ewes with similar condition from many flocks of autumn of Lori sheep were included in this experiment. The ewes divide into 4 groups of 12 sheep. The ewes allocated into 4 different levels of SPB (0, 5, 10 and 15%) for pre and post lambing in a completely randomized design. The diets were formulated according to NRC (1994) and had similar quality for protein, energy and high concentration of other nutrient. Concentrates were included amounts of 0, 10, 20 and 30 percent of SPB witch replaced with wheat bran and barely. Ewes live weight were measured before and at lambing and 2 weeks interval after that until weaning lamb. Milk sampling for determination of fat, Protein, carbohydrate and Solid Not Fat (SNF). Blood collected via jugular vein to indicate baseline (blood urea nitrogen, triglyceride, cholesterol and glucose). Statistical analysis with SAS program (1994) was indicated that, there were not significant differences between diets for milk composition percentage (fat, Protein, carbohydrate and solid not fat) (p<0.05). The effect of different levels of SPB on body change weight ewes and Average Daily Gain (ADG) lambs not significantly (p<0.05) different. Also there were not significant differences between diets for plasma cholesterol, BUN, triglyceride and glucose (p<0.05). In conclusion result of that could be SPB substituted instead of 30% concentrates (15% of whole diet) with no negative effects on physiological and productivity in pre and post lambing.
  M. Sabbagh Zade , N. Dabiri , J. Fayazi and M. Boujar Pour
  The effect of dietary containing different level of steam pressure hydrolyzed pith on performance and carcass characteristics in crossbred beef were investigated during a period of 20 weeks (140 days) using 24 beef of 3-5 month old with an average live weight of 157.5 kg. The dietary treatment were respectively 44% barley (diet1), 33% barley + 11%pith (diet2), 22% barley + 22% pith (diet3) and 11% barley + 33% pith (diet4). The beef were allocated to the diets according to complete block randomized design. The diet formulated according NRC and had approximately similar nutrition contents. Average Dry Matter Intake (DMI) of beef fed diet 1-4 during whole period of experiment were 6.62, 6.53, 6.48 and 6.34 kg day-1, respectively. Average Daily Gain (ADG) of beef for diets 1-4 during whole period of experiment were 1.07±0.06, 0.98±0.06, 0.86±0.07 and 0.77±0.07 kg day-1, respectively. Despite non-significantly difference between ADG of control group with beef fed diet 2 and 3, but beef fed diet 4 had significantly (p<0.05) lower ADG than control and treatment 2 groups. A significantly difference between feed conversion ratio (F/G) of control group with beef fed diet 4 was observed. Average F/G was, respectively 6.25±0.5, 6.67±0.5, 7.59±0.6 and 8.4±0.6 for diets 1-4. The main carcass characteristics were not affected by dietary treatment (p<0.05). This study suggests that beef fed diet 3 (22% barley + 22% pith) had also lower cost of production than control group which is important for Iran condition. So it concluded that pith a by product of sugar cane has been potential as an alternative feed source for ruminant.
  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.
  S. Mokhtarzadeh , J. Fayazi , M. Beigi Nasiri and K.H. Alamisaeed
  Leptin, the product of the obese (ob) gene, is a 16-kDa hormone that has been shown to play an important role in the regulation of food intake, energy expenditure and hypothalamus endocrine function in response to nutritional changes. Chicken leptin receptor is expressed in the hypothalamus, but also in other tissues such as pancreas, where leptin inhibits insulin secretion and thus, may have a key role in regulating nutrient utilization in this species. However, further studies have shown that leptin receptors are also expressed in many other tissues and have suggested that leptin is involved in more diverse biological functions than previously thought. The ability of insulin and leptin to regulate chicken leptin receptor gene expression suggests a direct role of leptin in the control of hepatic metabolism. In order to study of Leptin’s Receptor gene (LEPR) polymorphism, by using PCR-RFLP technique in native poultry population of Khouzestan province, a research was planed and done in molecular lab of Ramin agricultural and natural resources. In this research, a fragment of extracted DNA from native poultry blood's samples was amplified with PCR technique. This 2900 bp fragment consists of number 9-11 exon's of LEPR. This fragment was digested with HaeIII restricted enzyme. The pictures that were tacked from agarose gel showed 2 allele (A and B) for this fragment. The allele frequencies were 31.19 for A and 61.81 for B. The genotype frequencies were 18.81, 24.75 and 54.44 for AA, AB and BB genotypes, respectively. The studied population was in Hardy-Weinberg disequilibrium.
  B. Abbasi , J. Fayazi , M.T. Beigi Nasiri , H.A. Roshanfekr , Kh. Mirzadeh and A.S. Sadr
  Caseins are a family of milk proteins that approximately constitute 80% of total milk proteins. They are existing in several molecular forms (alpha S1, alpha S2, beta and kappa) with variant alleles of each. The A and B are the most common in cattle breeds. Allele A has threonine (ACC) and aspartic asid (GAT) amino acid at position 136 and 148, respectively by means of point mutation, isoleucine (ATC) substitutes threonine and aspartic acid is substituted by alanine (GCT) and variant A changes to variant B. In this study, the PCR-RFLP method was used for differentiating buffalo population in Khouzestan Province k-CN allels. In order to determaind the level of polymorphism, blood sample were collected from 86 buffalos in Shadegan, Ahwaz, Sosangerd, Dezfoul and Shoshtar cities. DNA extraction was based on Boom method and exon 4 of the kappa casein gene was amplified by specific set of primers for this gene to produce a 453 bp fragment. The amplified fragment were digested with Hinf I restriction endonuclease and then subjected to electrophoresis separation in ethidium bromide-stained 2.5% agarose gel. The results were revealed all buffalo samples were monomorph and genotyped as BB. In this breed, the B allele is only existed, which is reported to be favorable for milk quality and can use for breeding strategies of dairy animals.
  M. Bojar Pour , E. Bahmaninia , R. Ebrahimi and J. Fayazi
  This experiment was conducted to evaluate effect of different inclusion of oak kernel with determine food potential oak kernel substitute with corn seed on broiler chicken’s ration in particular their effect on feed intake, weight gain, feed conversion ratio and carcass broiler. The oak kernel was mixed with corn seed to replace 0, 7.5, 15 and 22.5% of dry matter. About 160 chickens are used in complete randomized design, 4 experimental treatments by 4 replication (per treatment 10 chicken replications) were feed to chickens in over 49 days. Statical analysis of dry matter intake, weight gain, feed conversion ratio for 7-35 days of chicken’s age were not significant means (p>0.05).
  M. T. Beigi Nassiri , Z. Beyranvand , T. Hartatik , J. Fayazi and S. Tavakoli
  The part of the bovine genome which shows a superior action and explains the major part of variation of the economical production traits were known as QTL. PIT1 gene which is also termed hormone factor-1 is a pituitary-specific transcription factor which has responsible for pituitary development and hormone expression in mammals. The main function of PIT1 is for binding and trans-activity promoters of both Growth Hormone (GH) and Prolactin (PRL) gene. It was subjected to different molecular studies as a key role for understanding genetic variation in dairy cattle. This study was aimed to detect the polymorphism in a part of PIT1 gene, exon 6, in Najdi cattle. DNA was extracted from blood sample collected from 84 Najdi cattle and submitted for Polymerase Chain Reaction (PCR) followed by digestion with HinfI restriction enzyme. Base on PCR-RFLP method, the researchers found that the frequency of the A and B alleles of this gene for Najdi cattle were 18.45 and 81.55%, respectively. The genotypic frequencies of AA, AB and BB were 3.57, 29.76 and 66.66%, 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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