屠宰前运输对肉鸡福利产生负面影响,肉类产量,和肉的质量,但是关于运输对中等生长的肉鸡的影响知之甚少。本研究旨在评估不同运输时间(0、0.5、1、2和3h)对中等生长黄羽肉鸡的应激生物标志物和肉质的影响。一百八十只75日龄(上市龄)的中国黄羽肉鸡,平均体重2.02公斤,分为五组;每组包含六个重复(六只鸟/重复(板条箱))。每个尺寸为74×55×27cm(长×宽×高)的板条箱装载六只鸟,也就是说,30kg活BW/m2板条箱。测试的传输持续时间增加了BW损失(线性,P<0.01),ACTH的血浆浓度(线性,P<0.10),皮质醇和皮质酮(二次,P<0.05),和谷胱甘肽过氧化物酶的活性(线性,P<0.05),而血浆葡萄糖不受影响。在乳房肌肉中,糖原的含量,乳酸,丙二醛,还原型谷胱甘肽不受影响(P>0.05),但总抗氧化能力下降(线性,P<0.01)。胸肌的滴水损失增加(线性,P<0.01),而剪切力,死后24h的pH值,和胸肉颜色亮度(L*),发红(a*),和黄色(b*)评分不受影响。总之,在75日龄黄羽肉鸡中,测试的运输持续时间(从0.5到3h)增加了BW损失和一些血浆应激生物标志物,但对肉质属性的影响较小。
Pre-slaughter transport exerts negative effects on broilers\' welfare, meat yield, and meat quality, but little is known about the effect of transport on medium-growing broiler chickens. This study aimed at evaluating the effects of different durations of transport (0, 0.5, 1, 2, and 3h) on stress biomarkers and meat quality of medium-growing Yellow-feathered broiler chickens. One hundred and eighty Chinese Yellow-feathered broilers aged 75days (marketing age), of 2.02kg average BW, were allotted into five groups; each group contained six replicates (six birds/replicate (crate)). Each crate with dimensions 74×55×27cm (length × width × height) was loaded with six birds, that is, 30kg live BW/m2 crate. The tested transport durations increased BW loss (linear, P<0.01), plasma concentrations of ACTH (linear, P<0.10), cortisol and corticosterone (quadratic, P<0.05), and activity of glutathione peroxidase (linear, P<0.05), whereas plasma glucose was not affected. In breast muscle, contents of glycogen, lactic acid, malondialdehyde, and reduced glutathione were not affected (P>0.05), but total antioxidant capacity decreased (linear, P<0.01). The drip loss of breast muscle increased (linear, P<0.01), whereas shear force, pH at 24h postmortem, and breast meat color lightness (L*), redness (a*), and yellowness (b*) scores were not affected. In conclusion, the tested transport durations (from 0.5 to 3h) increased BW loss and some plasma stress biomarkers in 75-day-old Yellow-feathered broiler chickens, but the effect on meat quality attributes was minor.