Rasoul Vaez Torshizi
Volume 19, Issue 2 , August 2017, , Pages 265-280
Abstract
The aim of this study was to compare the performance of immune system in Arian, Native, Arian × native crosses, native × Arian crosses and Ross chickens. Through artificial insemination, a total number of 298 birds produced and reared with 100 Ross strain chickens. Thereafter, 15 to 20 percent ...
Read More
The aim of this study was to compare the performance of immune system in Arian, Native, Arian × native crosses, native × Arian crosses and Ross chickens. Through artificial insemination, a total number of 298 birds produced and reared with 100 Ross strain chickens. Thereafter, 15 to 20 percent of chickens were randomly chosen for immune system performance and some of blood parameters comparison. The studied traits were humoral, cell-mediated and innate immunity responses, plasma protein concentrations and relative weight of lymph organs. Data were analyzed using GLM procedure and means were compared using Tukey method. The highest titer of total antibody was in Arian strain and the lowest was in Ross strain. There was no significant difference between sexes and strains for cell-mediated immunity. Responses in crossbred chickens for humoral and cell-mediated immunity were not significantly different from Ross strain. No significant difference was observed for hematocrit percent between crossbred chickens and commercial strains. In crossbred chickens, the percentage of plasma albumin was significantly higher than the other strains (P<0.05). While, the lysozyme activity of crossbred chickens was significantly lower than Arian strain (p<0.05), it did not indicate any difference with Ross strain. The relative weight of all organs in crossbred chickens was lower than native and higher than commercial chickens. The results of current study indicated that the performance of immune system in crossbred chickens was favorable and in some cases better than the other strains. Therefore, it is possible to create resistance birds with suitable growth performance from crosses of native and commercial strains.
Hossein Emrani; Rasoult Vaes Torshizi
Volume 19, Issue 1 , May 2017, , Pages 33-45
Abstract
Ascites Syndrome is a costly metabolic disorder that has been linked to intense selection on growth rate and low feed conversion ratio in broilers. This Syndrome has become one of the most frequent causes of mortality within the broiler industry and leads to substantial economic losses and reduced animal ...
Read More
Ascites Syndrome is a costly metabolic disorder that has been linked to intense selection on growth rate and low feed conversion ratio in broilers. This Syndrome has become one of the most frequent causes of mortality within the broiler industry and leads to substantial economic losses and reduced animal welfare. To identify genes and genomic regions associated with Ascites Syndrome, genome wide association study was performed by the chicken 60K SNP panel on 101 birds from a F2 chicken population derived from the reciprocal cross between Arian broiler Line and Azerbaijan native fowls. Genomic best linear unbiased prediction procedure was used to calculate associations between each SNP and ascite related traits. Several SNPsfor the ratio of right ventricular to total ventricular, an indicator for Ascites syndrome, reached the suggestive threshold (8.25×10-5) on chromosome 7. Two SNPs detected within CCDC141 and OSBPL6 genes were previously reported for human heart disorder. There are a large number of genes in this region (12745561-14602723) on chicken chromosome 7 that are related to hypertrophic cardiomyopathy, heart rate and human heart disorder. Selection for ascites resistance in broiler chicken using these findings could accelerate the genetic progress.
ali javanrouh aliabad; Ali akbar masoudi; alireza ehsani
Volume 18, Issue 4 , December 2016, , Pages 697-709
Abstract
In order to identify loci and genes associated with meat quality traits, genome-wide association study (GWAS) were conducted in a F2 population derived from a reciprocal cross between Azerbaijan native chickens and Aryan broiler line by using Illumnia 60 K Chicken SNP Bead chip. For each bird, a total ...
Read More
In order to identify loci and genes associated with meat quality traits, genome-wide association study (GWAS) were conducted in a F2 population derived from a reciprocal cross between Azerbaijan native chickens and Aryan broiler line by using Illumnia 60 K Chicken SNP Bead chip. For each bird, a total 6 traits including water holding capacity, meat color lightness (L*), redness (a*), yellowness (b*), shear force and ultimate pH were measured. The SNPs that were associated with meat quality traits were identified using both GLM and compressed mixed linear models (CMLM). A total of 36 SNPs were associated with meat quality traits in the genome–wide significance and suggestive levels, that 3 SNPs were significantly associated with meat color yellowness through CMLM model and 18 SNPs were suggestively associated with meat color yellowness, ultimate pH, water holding capacity and shear force through GLM model. The identified candidate genes have molecular functions related to meat quality traits. So, these candidate genes can be applied in the chicken breeding scheme.