To evaluate how age, genotype (Cobb500 vs. Ross308) and feeding regime (AL: ad libitum; ER: early restricted from 13 to 23 d of age; LR: late restricted from 27 to 37 d; restriction rate: 80% of ad libitum) affected muscle fibre degeneration (MFD) associated to white striping and wooden breast, 144 Pectoralis major from male chickens were sampled at 23, 36, and 48 d of age for histological analyses and scored for MFD level (0=normal, 1=mild, 2=moderate, 3=severe). PROC GLIMMIX of SAS was used to evaluate the effect of main factors and interactions. When age increased, MDF level increased from 1.25 to 1.88 and 2.42 (P<0.001). The feeding regime did not show any effect, but interaction with age tended to be significant (P<0.10): at 23 d, MFD score was 1.28, 1.06, and 1.41 in AL, ER, and LR broilers; at 36 d, the score was 2.14 to 1.92 and 1.58; at 48 d, 2.37, 2.44, and 2.44. Finally, Cobb500 chickens exhibited lower MFD than Ross308 ones (1.67 vs. 2.03; P<0.01). In conclusion, MFD appeared early, increased with age, and changed with genotype; feed restriction lowered MFD only during the restriction period. Further improvements of feeding strategies may contribute to control broiler myopathies.
Effect of feeding system and age on muscle fibre degeneration in two broiler chicken genotypes
Gratta, F.;Birolo, M.;Ballarin, C.;Bertotto, D.;Radaelli, G.;Piccirillo, A.;Xiccato, G.;Trocino, A
2017
Abstract
To evaluate how age, genotype (Cobb500 vs. Ross308) and feeding regime (AL: ad libitum; ER: early restricted from 13 to 23 d of age; LR: late restricted from 27 to 37 d; restriction rate: 80% of ad libitum) affected muscle fibre degeneration (MFD) associated to white striping and wooden breast, 144 Pectoralis major from male chickens were sampled at 23, 36, and 48 d of age for histological analyses and scored for MFD level (0=normal, 1=mild, 2=moderate, 3=severe). PROC GLIMMIX of SAS was used to evaluate the effect of main factors and interactions. When age increased, MDF level increased from 1.25 to 1.88 and 2.42 (P<0.001). The feeding regime did not show any effect, but interaction with age tended to be significant (P<0.10): at 23 d, MFD score was 1.28, 1.06, and 1.41 in AL, ER, and LR broilers; at 36 d, the score was 2.14 to 1.92 and 1.58; at 48 d, 2.37, 2.44, and 2.44. Finally, Cobb500 chickens exhibited lower MFD than Ross308 ones (1.67 vs. 2.03; P<0.01). In conclusion, MFD appeared early, increased with age, and changed with genotype; feed restriction lowered MFD only during the restriction period. Further improvements of feeding strategies may contribute to control broiler myopathies.Pubblicazioni consigliate
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