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 ...
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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.
Saifali Varmaghany; Farzad Bastami; Mohammad Akbari Gharaei
Volume 19, Issue 1 , May 2017, , Pages 175-187
Abstract
The effect of dietary olive leaf in diet at different periods of breeding was studied on growth performance and ascites incidence in broiler chickens. A total of 336 one day-old male broiler chickens (Arian) used in complete randomize design with 6 treatments, 4 replications and 14 birds in each replication. ...
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The effect of dietary olive leaf in diet at different periods of breeding was studied on growth performance and ascites incidence in broiler chickens. A total of 336 one day-old male broiler chickens (Arian) used in complete randomize design with 6 treatments, 4 replications and 14 birds in each replication. The period of experiment was 42 days. The rations were supplied base on recommendation of Arian broiler management guide in three phase of feeding. In each phase, tow diets were provided with 0 (control) and 1 percent of olive leaves dried in diet. The treatments were diets:1) control, 2) from 1 to 14 days olive leaf, 3) from 1 to 21 days olive leaf, 4) from 1 to 28 days olive leaf, 5) from 1 to 35 days olive leaf, 6) from 1 to 42 days olive leaf. The effects of treatments were not significant on final body weight, daily feed intake and feed conversion ratio. The mortality due to ascites syndrome was reduced in treatments of olive leaf 1 to 14 and olive 1 to 42 (P<0.05). At the end of experiment, the most of packed cell volume and hormone triiodothyronine was related to the control treatment (P<0.05). The mean of packed cell volume and T3 were significantly different between control and olive leaf from 1 to 42 days at the end of experiment (P<0.05). The difference of red blood cell count and thyroxine (T4) was not significant between all treatments. It is concluded that the inclusion of 10 g/Kg of olive leaf dried in broiler chicken diets could decrease ascites incidence without unfavorable effects on broiler chicken performance.