Increased activity reduces the prevalence of woody breast in Ross 708 and Ranger Gold broilers.

Autor:	Hisasaga C; Department of Animal Science, Center for Animal Welfare, University of California, Davis, Davis, CA 95616, USA; Animal Biology Graduate Group, College of Agricultural and Environmental Sciences, University of California, Davis, Davis, CA 95616, USA., Makagon MM; Department of Animal Science, Center for Animal Welfare, University of California, Davis, Davis, CA 95616, USA; Animal Biology Graduate Group, College of Agricultural and Environmental Sciences, University of California, Davis, Davis, CA 95616, USA. Electronic address: mmakagon@ucdavis.edu.
Jazyk:	angličtina
Zdroj:	Poultry science [Poult Sci] 2024 Dec; Vol. 103 (12), pp. 104330. Date of Electronic Publication: 2024 Sep 12.
DOI:	10.1016/j.psj.2024.104330
Abstrakt:	Woody or wooden breast (WB) is characterized by hardening and paleness of the Pectoralis major muscle and can affect up to 85% of broilers. We hypothesized that increased locomotor activity would lead to a lower prevalence of WB and increased tibia bone quality, with a greater effect on a faster growing than a slower growing broiler strain. Ross 708 (N = 188) and Ranger Gold (N = 213) broilers were raised in 3.05×3.05 m 2 pens in groups of 23 to 24 and 26 to 27, respectively. Target ages for the Ross 708 and Ranger Gold birds were 42 and 56 d. There were 8 pens per strain: 4 assigned to an exercise treatment and 4 unexercised controls. An exercise regimen was applied for 10 min every hour for 6 h during each weekday with the goal of increasing frequency of standing and walking. A perch was placed between the feeder and drinker line in the exercise treatment pens to further promote broiler activity. WB severity was determined by palpation for all birds at the target age. Tibial bone mineral content (BMC) and bone mineral density (BMD) were measured using a dual-energy x-ray absorptiometry. The Fisher's Exact Test was used to determine treatment effects on the prevalence and severity of WB. Both prevalence (Ross 708: 77.5 vs. 90.5% control, P = 0.013; Ranger Gold: 57.9 vs. 76.4% control, P = 0.005) and severity (Ross 708: 12.9 vs. 24.2% control, P = 0.02; Ranger Gold: 4.7 vs. 0.02% control, P = 0.01) were reduced by treatment. The effects of strain, treatment and their interaction on tibial BMC and BMD were analyzed using linear mixed models. Only strain affected BMC (P = 0.003) and BMD (P = 0.03), with Ross 708 broilers having higher BMC (control: 3.246 g ± 0.061; treatment: 3.251 g ± 0.058) and BMD (control: 0.177 g/cm 2 ± 0.002; treatment: 0.174 g/cm 2 ± 0.002) values compared to Ranger Gold's BMC (control: 2.966 g ± 0.067; treatment: 2.987 g ± 0.064) and BMD (control: 0.168 g/cm 2 ± 0.002; treatment: 0.168 g/cm 2 ± 0.002) values. However, per unit of final body weight, Ranger Gold birds had a significantly higher BMC (P = 0.006) and BMD (P = 0.01) than Ross 708 broilers. Promoting broiler activity can reduce the prevalence and severity of WB prevalence in fast and slow growing broilers. Competing Interests: DISCLOSURES The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Cirenio Hisasaga reports financial support was provided by Jastro-Shields Award, UC Davis. Cirenio Hisasaga reports financial support was provided by Western Poultry Scholarship and Research Foundation. Maja Makagon reports equipment, drugs, or supplies was provided by Lubing. Maja Makagon & Cirenio Hisasaga reports equipment, drugs, or supplies was provided by Pitman Family Farms. Maja Makagon is currently an Associate Editor for the Animal Behavior & Wellbeing Section of Poultry Science. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze:	MEDLINE
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