What can carcass-based assessments tell us about the lifetime welfare status of pigs?
What can carcass-based assessments tell us about the lifetime welfare status of pigs?
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DOI：
10.1016/j.livsci.2018.04.020
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发表时间：
2018-08-01
影响因子：
1.8
通讯作者：
O'Connell, N. E.
中科院分区：
文献类型：
--
作者：
Carroll, G. A.;Boyle, L. A.;O'Connell, N. E.
人们对制定以屠宰场为基础的农场动物福利措施越来越感兴趣。重要的是要了解这些措施在多大程度上反映了终身福利状况。这项研究的目的是确定在不同生产阶段获得的病变是否在屠体上仍然可见，以及基于屠体的措施可能在多大程度上反映更广泛的健康和福利问题。在7、9和10周龄(早期生命，EL)以及15和20周龄(后期生命，LL)对532只动物进行了尾部病变(TL)、皮肤病变(SL)和一些健康问题(HI)的评估，包括跛行和咳嗽。猪被根据生产过程中出现个别福利问题的时间进行分类；如果在农场没有表现出特定的福利问题的迹象，则将猪分为早期生活[EL]、后期生活[LL]、‘终生生活’[WL]或‘未受伤’(U)。屠宰后，对屠体的尾长、尾部损伤和皮肤损伤进行评分，并获得冷屠体重量(CCW)。采用广义线性、有序Logistic和二元Logistic固定模型程序，检验TL、SL和HI寿命类别对屠宰性状的预测能力。El、LL和WL的TL猪的屠体尾部损伤评分显著高于U猪(P<；0.001)。具有TL的L1(P<；0.05)和WL(P<；0.001)的猪在屠宰时的尾巴也比U猪短，但EL(P>；0.05)没有。与TL评分相比，U猪的冷屠体重量也高于LL猪和WL猪(P<；0.001)，而El猪则没有(P>；0.05)。El、LL和WL的SL猪在屠体上的愈合皮损评分高于U猪(P<；0.001)。一生中记录的健康问题没有反映在所用的屠体测量中(P&gT；0.05)。目前的研究表明，在屠宰前至少10周获得的尾部损伤和皮肤损伤在屠体上仍然很明显，因此，可能有助于确定猪的终身福利状况。低CCW与尾部病变相关，支持了先前的研究，即尾部病变对猪的生长性能有负面影响。
There is increasing interest in developing abattoir-based measures of farm animal welfare. It is important to understand the extent to which these measures reflect lifetime welfare status. The study aim was to determine whether lesions acquired during different production stages remain visible on the carcass, and the degree to which carcass-based measures may reflect broader health and welfare issues. 532 animals were assessed at 7, 9 and 10 weeks of age (early life, EL), and at 15 and 20 weeks of age (later life, LL) for tail lesions (TL), skin lesions (SL) and a number of health issues (HI) including lameness and coughing. Pigs were categorised according to when individual welfare issues occurred in the production process; 'early life' [EL], 'later life' [LL], 'whole life' [WL], or 'uninjured' (U) if showing no signs of a specific welfare issue on-farm. Following slaughter, carcasses were scored for tail length, tail lesions, and skin lesions and cold carcass weights (CCW) were obtained. Generalised linear, ordinal logistic and binary logistic fixed model procedures were carried out to examine the ability of TL, SL and HI lifetime categories to predict carcass traits. Pigs with TL in EL, LL and WL had higher carcass tail lesion scores than U pigs (P < 0.001). Pigs with TL in LL (P < 0.05) and WL (P < 0.001), but not in EL (P > 0.05), also had shorter tails at slaughter than U pigs. In relation to TL scores, U pigs also had a higher cold carcass weight compared to LL and WL (P < 0.001), but not EL pigs (P > 0.05). Pigs with SL in EL, LL and WL had higher healed skin lesion scores on the carcass than U pigs (P < 0.001). Health issues recorded during lifetime were not reflected in carcass measures used (P > 0.05). The current study shows that tail lesions and skin lesions, acquired at least 10 weeks before slaughter, remain evident on the carcass and consequently, may be useful as tools to assist in determining the lifetime welfare status of pigs. Low CCW was associated with tail lesions, supporting previous research suggesting that tail lesions have a negative impact on growth performance in pigs.