Genetic and Hormonal Difference between High Growth Rate Breed (Cobb Broiler chicken) and Low Growth Rate Breed (Native Fayoumi chicken)

Document Type : Original Article

Authors

1 Physiology,veterinary medicine,kafershoker

2 pysiology depatment, faculty of veteriary medicine, benha university

3 physiology department, faculty of vetrinary medicine, benha university

4 Faculty of Veterinary Medicine, Benha University

Abstract

Abstract
The present study aimed at investigating the genetic and hormonal differences between a low growth rate chicken breed (a native breed: Fayoumi chicken) and a high growth rate chicken breed (Cobb broiler chicken). A total number of 100 one-day-old Fayoumi chicks and 100 one-day-old Cobb chicks were used. Chicks of each breed were allocated into three equal replicates. The growth parameters (body weight, BWG and FCR), genetic expression of some growth related genes (GH, IGF1, ghrelin and Myostatin gene) and plasma level of some growth related hormones (Insulin, T3, T4 and corticosterone) were recorded. The obtained results revealed that, Cobb chicken had significantly higher body weight, BWG and feed intake than Fayoumi chicken but the FCR of Fayoumi chicken was higher than that of broiler chicken. Cobb recorded significantly lower plasma level of corticosterone, T3 and T4 than Fayoumi chicken while Insulin is higher in cobb chicken. Cobb recorded highly significant values of GH, IGF1 and ghrelin Gene expression while myostatin gene expression was higher in Fayoumi chicken than in Cobb From the obtained results could be concluded that, the observed high growth rate in cobb chicken may be attributed the difference gene expression related growth as well as hormonal difference

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Benha Veterinary Medical Journal
Volume 39, Issue 1
September 2020
Pages 28-33

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