Resumen

ARBIZU, JM et al. Meat quality and slaugh- terperformance ofmale hybrid broilers reared in an alternativepoultryproduction system. Rev. vet. [online]. 2021, vol.32, n.2, pp.151-154. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.3225723.

Alternative poultry production is growing due to consumer demand for differentiated products, such as meat from poultry raised in pastoral systems. The objective of this work was to evaluate the effect of the use of a semi-extensive system with access to pasture (T) on slaughter performance and meat quality in male Cobb 500 chickens, in a cycle of 49 days, compared to a system in confinement (C), in the different seasons of the year. Statistical analysis was performed using ANOVA for a 2 x 4 factorial design (2 rearing systems and four seasons). Statistically significant differences were observed for meat quality variables with PPC values (p = 0.019), 26.68 ± 1.63 (C), 29.39 ± 1.39 (T)%, pH (p=0.039) 5, 94 ± 0.04 (C) 6.02 ± 0.03 (T), suggesting a different energy balance in favor of the chickens in the control group. On the other hand, tenderness showed significant differences (p=0.025)1.16 ± 0.06 (C), 1.32 ± 0.08 (T) kg/cm2, which allows to assume an effect of physical activity on the accumulation of connective tissue in the muscles of the treated group. In the yielding variables, significant differences were observed with yielding values of leg thigh (p=0.036) 27.33 ± 0.2 (C), 27.9 ± 0.29 (T)%, accumulated fat (p=<0.0001) 1.49±0.13 (C), 0.94 ± 0.08 (T)%, alluding that the greater physical activity developed by the treated group resulted in a decrease in the amount of abdominal fat along with a higher protein accretion in leg thigh. In breast yield (p=0.031) 31.6 ± 0.23 (C) 30.8 ± 0.33 (T)%, the chickens in the control group distributed the nutrients supplied differently, resulting in greater breast development and abdominal fat accumulation. It is concluded that the housing system affects the technological characteristics and the composition of the carcass that are reflected in the different distribution of nutrients through modifications in the physical activity developed by the birds.

Palabras clave : chickens grilled; pastoral system; quality; meat; fat accumulate..

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