Comparison of carcass yields in four strains of commercial broiler chickens popularly raised in Thailand
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Abstract
Objective: To compare carcass yields in four strains of commercial broiler chickens (Cobb 500, Ross 308, Arbor Acres, and Hubbard) that popularly raised in Thailand.
Materials and Methods: The studied broiler chickens were randomly selected from the flocks raised in the same rearing period under identical conditions of the closed commercial housing (a tunnel ventilation system) with the size of 14m x 120m (width x length) and automatic feeding system. A total of 80 chickens at the age of 39 days from four strains including Cobb 500, Ross 308, Arbor Acres, and Hubbard were used in this study. Twenty chickens (10 males and 10 females) from each breed were selected. For study eligibility, chickens must have their body weight within ± 2.5% of their standard body weight for each breed at 39 days of age. Measurements were made on live body weight, body weight without feed, carcass weight, dressing part weight, visceral organ weight, and others. Data were analyzed with one-way ANOVA and Tukey’s HSD test.
Results: Body weight without feed in crop and gizzard was greatest in Hubbard (mean±SD in grams, 2649.10±209.93), followed by Cobb 500 (2587.40±111.60), Ross 308 (2584.70±190.12), and Arbor Acres (2430.30±181.37). The weight of eviscerated carcass was greatest in Hubbard (mean±SD in grams, 2062.50±159.90), Cobb 500 (1991.40±105.14), Ross 308 (1974.60±169.92), and Arbor Acres (1872.80±147.93), accounted for the carcass yields of 77.87%±1.12%, 76.93%±0.91%, 76.33%±1.19% and 77.04%±1.00% of the body weight without feed in crop and gizzard, respectively. The weight of pectoral muscle was greatest in Hubbard (mean±SD in grams, 744.50±57.21) Cobb 500 (701.43±98.87), Ross 308 (669.55±68.81), and Arbor Acres (597.90±50.02), accounted for the carcass yields of 28.14%±1.40%, 27.01%±2.82%, 25.88%±1.73%, and 24.61%±1.24% of the body weight without feed in crop and gizzard, respectively.
Conclusion: The variation of carcass yields was observed among the four strains of commercial broiler chickens. However, selection of the strains should account for other factors such as, feed conversion ratio, culling and mortality rates.
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References
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