期刊
POULTRY SCIENCE
卷 92, 期 2, 页码 435-443出版社
ELSEVIER
DOI: 10.3382/ps.2012-02360
关键词
outdoor access; growth performance; meat characteristic; broiler
资金
- National Natural Science Foundation of China-Guangdong Province Joint Fund (Beijing, China) [U0931004]
- National Basic Research Program of China (Beijing, China) [2009CB941601]
- Special Fund for Agro-scientific Research in the Public Interest (Beijing, China) [201003011]
- NSFC-Guangdong Joint Fund [U0931004]
- National Basic Research Program of China [2009CB941601]
- Special Fund for Agro-scientific Research in the Public Interest [201003011]
The present study was conducted to investigate the effects of outdoor access on the growth performance and meat quality of broiler chickens. Thirty-five-day-old female broilers were divided into 3 groups with 6 replicates of 124 birds each: (1) birds reared indoors (control group); (2) birds reared with outdoor access since 36 d of age (35-d group); and (3) birds reared with outdoor access since 71 d of age (70-d group). The results showed that outdoor access had no effect on growth performance, carcass yield, meat yield, muscle protein content, muscle fiber characteristics, or water-holding capacity (P > 0.05). Chickens from the outdoor access groups had a better appearance and degree of evenness. Birds in the outdoor access groups had a significantly lower lung percentage than birds in the control group (P < 0.05), whereas the kidney percentage of the 35-d group was significantly lower than that of the control group (P < 0.05). The meat of chickens in the 35-d group had higher L* values than that of the control group (P < 0.05). Compared with rearing indoors, outdoor access significantly increased the shear force of the breast muscle in both the 35 d and 70-d group (P < 0.05) and decreased the fat content of the thigh muscle in the case of 35-d group (P < 0.05). Birds in the 35-d group also had lower fat content in their thigh muscles than did the birds in the 70-d group (P < 0.05). The thigh muscles of the birds in the 35-d group showed lower levels of MUFA and higher levels of PUFA than those of the control group and 70-d group (P < 0.05). In conclusion, outdoor access had no effect on growth performance and yield traits but could improve the meat quality; birds reared with outdoor access from 36 d of age had better appearance and meat quality than those with outdoor access from 71 d of age.
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