Poultry
Manoochehr Allymehr; Kamyar Yousefi; Alireza Talebi; Amir Tukmechi
Articles in Press, Accepted Manuscript, Available Online from 20 February 2024
Abstract
The aims of current investigation were to study the growth performance, carcass traits, meat quality and expression profile of Myostatin (MSTN), Insulin-like growth hormone type I (IGF-I), Myogenin (MyoG) and Myogenic regulatory factor 4 (MRF4) genes in three commercial broiler strains including Ross ...
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The aims of current investigation were to study the growth performance, carcass traits, meat quality and expression profile of Myostatin (MSTN), Insulin-like growth hormone type I (IGF-I), Myogenin (MyoG) and Myogenic regulatory factor 4 (MRF4) genes in three commercial broiler strains including Ross 308 (Ross), Cobb 500 (Cobb), and Arian (Arian) in 2023. A total of 240 one-day-old chicks were reared under an equalized standard management condition for six weeks. Performance, organ weights, meat quality, and the expression level of the myogenic genes in the pectoral muscle were investigated. The lowest body weight, feed intake, weight gain and highest feed conversion ratio (FCR) was observed for Arian at the end of the study (p<0.05). The meat quality was similar between strains (p>0.05). The IGF-I expression level was significantly higher at 42 days of age in Cobb compared to Ross and Arian (p<0.001). The MRF4 expression level was significantly higher at 28 days of age in Cobb compared to Ross (p<0.001). The MyoG expression level was significantly lower in Arian compared to Cobb at 42 days of age (p<0.05). Furthermore, the MSTN expression level was significantly lower in Cobb compared to Ross and Arian at 42 days of age (p<0.05). The remarkable differences in gene expression levels at the end of the rearing period was supported by higher growth performance and body weight of Cobb compared to RossandArian strains. In conclusion, the finding of current study will conveniently help to assess the performance of these broiler strains under similar rearing condition.
Alireza Talebi; Amir Tukmechi; Ali-Asghar Tehrani; Sorayya Mahmudi
Volume 11, Issue 4 , December 2020, , Pages 427-429
Abstract
The black proventriculus is a necropsy finding sign observed during post-mortem examinations of dead young chicks up to 10 days of age and due to variation in color of the affected proventriculus organ, it may be ignored in some cases, in particular when the disease occurs simultaneously with other well-recognized ...
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The black proventriculus is a necropsy finding sign observed during post-mortem examinations of dead young chicks up to 10 days of age and due to variation in color of the affected proventriculus organ, it may be ignored in some cases, in particular when the disease occurs simultaneously with other well-recognized infections of two weeks old chicks. In late January 2018, several live and dead chicks with a history of an unusual increase in mortality showing no clinical signs but sudden dead were referred to the poultry clinic of Faculty of Veterinary Medicine, Urmia University, Urmia, Iran. General routine postmortem examination revealed color changes (light green to dark green color) in the wall of proventriculus together with some degrees of congestion in the lungs and liver of the dead chicks. Microbiology tests revealed that the causative agent was Escherichia coli strain O142 and histopathological examination indicated that the color changing of the organ was due to necrosis of glandular epithelium with locally extensive or diffuse hypercellularity by lymphocytes and macrophages with hemorrhages. In conclusion, black proventriculus due to E. coli strain O142 was responsible for the sudden death of young chicks and based on antibiogram, selective antibiotics should be used for the treatment of the affected flocks.
