Influence of pre-slaughter fasting time on weight loss, meat quality and carcass contamination in broilers.
Influence of pre-slaughter fasting time on weight loss, meat quality and carcass contamination in broilers.
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屠宰前禁食时间对肉鸡减重、肉质和胴体污染的影响
DOI：
10.5713/ajas.20.0560
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发表时间：
2021-06
影响因子：
2.2
通讯作者：
Bao J
中科院分区：
文献类型：
--
作者：
Xue G;Cheng S;Yin J;Zhang R;Su Y;Li X;Li J;Bao J
目的研究地面饲养和散养方式下肉鸡适宜的宰前禁食时间。方法120只AA肉仔鸡于出雏21 d后随机分为地面饲养组和散养组，每组鸡分别进行0、4、6、8和10 h的停饲处理。测定了54日龄肉仔鸡胴体污染、体质量损失、肉质等指标。结果停饲时间越长，失重率、体重减轻率、失重率越高，pH值越低，停饲6 ~ 10 h后，地面和散养鸡的失重率和体重减轻率均显著高于散养鸡（p<0.05）。散养组在禁食6和10 h时，胸肌pH值在宰后45 min时均降低，而地面组仅在禁食10 h时降低（p<0.05）。禁食10 h后，散养组的脱落率显著高于其他组（P<0.05）。污染倾向的变化表明，6至10小时禁食显着降低胴体污染的可能性，无论是地面饲料和分散饲料（p<0.05）。地面饲料组禁食10 h后，肌胃内容物的净重显著降低（P <0.05），散养组禁食6 h和10 h后，肌胃内容物的净重显著降低（P<0.05）。全肠的下降发生在地面饲养的肉鸡停饲4 h以上，散养的肉鸡停饲8h以上（P<0.05）。结论在不明显损害家禽产品品质和福利的前提下，适当的禁食时间可以减少屠体污染。目前的数据表明，6小时禁食是可行的地板和分散饲料屠宰前肉鸡。
Objective An experiment was conducted to determine the appropriate fasting time prior to slaughter for broilers in floor-feed and scatter-feed mode. Methods On 21 d since hatching, 120 Arbor Acres broilers were divided into floor-feed and scatter-feed groups, chicks from each group were further assigned to feed withdrawal treatments for 0, 4, 6, 8, and 10 h. Some resultant indicators such as carcass contamination, body weight loss, meat quality of 54-day-old broilers were measured. Results It appears that longer feed withdrawal increased weight loss, lightness, drop loss of meat but reduced pH. A significant higher weight loss and lightness for both floor-feed and scatter-feed chicks coincided after 6 to 10 h feed withdrawal (p<0.05). pH for breast muscle at 45 min postmortem reduced when chicks of scatter-feed were fasted 6 and 10 h, while the reduction of floor-feed group occurred only in 10 h (p<0.05). A noticeable effect of feed withdrawal on drop loss occurred after 10 h fasting in scatter-feed of which drop loss were significantly higher than that for other groups including control (p<0.05). The change of contamination propensity revealed that 6 to 10 h fasting significantly reduced the likelihood of carcass contamination under both floor-feed and scatter-feed (p<0.05). Net weights of intestinal contents for gizzard were significantly reduced after feed deprived for 10 h in floor-feed and 6 and 10 h in scatter-feed (p<0.05). The decrease for whole intestine occurred after floor-feed broilers have been without feed for more than 4 h, scatter-feed broilers for more than 8 h (p<0.05). Conclusion On the premise that poultry product properties and welfare were not significantly damaged, proper fasting time could reduce carcass contamination. Current data implied that 6 h fasting was recommendable for both floor and scatter feed pre-slaughter broilers.