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    Influence of age on the incidence of wooden breast and white striping, carcass composition, meat physicochemical property, texture profile, and chemical composition of broiler chickens
    (2022-01-01)
    Jumanee, S.
    ;
    Chaosap, C.
    ;
    Sivapirunthep, P.
    ;
    Klompanya, A.
    ;
    Setakul, J.
    The effects of the age at 43 and 51 days on the incidence of wooden breast (WB) and white striping (WS), carcass composition, meat physicochemical property, textural profile, and chemical composition of broiler chickens were investigated. The frequency and percentage of WB and severity of WS did not differ between age groups. Live weight and carcass weight were affected by age, except the carcass composition percentages. Breast, thigh, wing, and leg weights were not differences between groups. However, the percentage of the thigh was higher in broilers at 51 days of age than at 43 days of age. The percentage of meat physicochemical properties; pH3 and pH24 of broilers at 43 days of age were higher than those at 51 days of age (P<0.01). Broiler meat at 51 days of age had statistically significant higher a<sup>∗</sup>value, while L<sup>∗</sup>, b<sup>∗</sup>, chroma, and hue values were not significant differences. There were not significant differences in drip loss percentage, cooking loss percentage, and shear force value. Hardness, gumminess, and chewiness were higher in 51-day-old broilers than 43-day-old broilers (P<0.05), except the cohesiveness of cooked meat of 51-day-old broilers was higher than that of 43-day-old broilers (P>0.05). For meat chemical composition, the different age groups did not affect the chemical composition, but only the percentage fat content of 51-day-old broilers tended to be higher than that of 43-day-old broilers.
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    Effects of guanidinoacetic acid supplementation on productive performance, pectoral myopathies, and meat quality of broiler chickens
    (2021-11-01)
    Khalil, Shady
    ;
    Saenbungkhor, Nualprae
    ;
    Kesnava, Kajorn
    ;
    Sivapirunthep, Panneepa
    ;
    Sitthigripong, Ronachai
    The effects of guanidinoacteic acid (GAA) supplementation on productive performance, pectoral myopathies, and meat quality of broilers were studied. Treatments consisted of corn/soybean-based diets with a GAA supplement (0%, 0.06%, and 0.12%). A total of 546 one-day-old Ross-308 males were randomly allocated to 42 floor pens with 14 replicates (13 birds/pens) for each treatment. The results showed that GAA at doses of 0.06% and 0.12% improved feed conversion, increased the percentage of normal breast, and decreased the severity of wooden breast. Breast muscle myopathy severity was positively correlated with heavy birds and negatively correlated with breast muscle creatine and glycogen. Breast muscle creatine and glycogen correlated positively with normal, less severe pectoral myopathies and meat quality. In conclusion, GAA supplementation improved broiler performance without exacerbating pectoral myopathy or affecting meat quality.