Effect of split marketing on the welfare, performance, and carcass traits of finishing pigs
Effect of split marketing on the welfare, performance, and carcass traits of finishing pigs
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DOI：
10.2527/jas.2010-3453
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发表时间：
2012-01-01
影响因子：
3.3
通讯作者：
Boyle, L. A.
中科院分区：
文献类型：
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作者：
Conte, S.;Lawlor, P. G.;Boyle, L. A.
本研究的目的是比较分割营销（SM）策略（其中一组中最重的猪比其他猪更早被移出并屠宰）与全面（AO）营销策略（其中所有猪同时从栏内移出并在同一天屠宰）在未去势（即完整）雄性和雌性猪的福利、生产性能和胴体性状方面进行比较。实验处理按 2 x 2 因子数组排列，其中 1) 营销策略（SM 与 AO）和 2）性别（雄性与雌性），产生 4 个处理组，每组 14 头猪（73.1 +/- 4.8 kg）：雄性 SM、雄性 AO、雌性 SM 和雌性 AO（7 个重复/组）。 AO组的猪在试验6周后全部被屠宰，而SM组中的3头最重的猪在该组其余猪之前2周被取出并屠宰，其余猪与AO猪同时屠宰。每天用长食槽喂猪 3 次流质饲料。在 SM 之前和之后、SM 当天以及 1 周和 2 周后进行行为观察。在饲喂事件期间和之间记录行为，并对所有猪的皮肤损伤进行评分，除了在 SM 之前和之后 2 周从 SM 组中移出的 3 头猪之外。记录生长性能、饲料效率和胴体性状。将 3 头猪从 SM 组中移出后，饲料事件期间的攻击性互动次数减少。在男性组的 SM 当天（SM 之前：24.3 vs SM 当天：14.7，SED = 3.31，交互 P < 0.05）和女性组的后续观察中观察到攻击性交互的减少（SM 之前：21.4 vs SM 之后天：13.4，SED = 3.31，交互 P < 0.05）。然而，SM 对进食事件之间记录的行为或皮肤损伤的数量和严重程度没有影响（P > 0.10）。 SM组剩余11头猪与AO组14头猪在生长性能、饲料效率、母猪或完整公猪胴体性状方面均无差异（P>0.10）。然而，与 AO 组的猪相比，SM 组猪的栏内胴体重量 CV 降低（8.6 vs. 10.9，SEM = 0.72，P < 0.05）。因此，在限制性饲喂的猪中，SM策略通过减少饲喂过程中的攻击性相互作用来改善母猪和完整公猪的福利，但对生产性能或胴体性状没有影响。
The aim of this study was to compare a split marketing (SM) strategy, in which the heaviest pigs in a group are removed and slaughtered earlier than the others, with an all-out (AO) marketing strategy, in which all pigs are removed from the pen simultaneously and slaughtered on the same day, in terms of welfare, performance, and carcass traits of noncastrated (i.e., intact) male and female pigs. The experimental treatments were arranged in a 2 x 2 factorial array with 1) marketing strategy (SM vs. AO) and 2) sex (males vs. females), which yielded 4 treatment groups of 14 pigs (73.1 +/- 4.8 kg): male SM, male AO, female SM, and female AO (7 replicates/group). Pigs in AO groups were all slaughtered after 6 wk on trial, whereas in SM groups the 3 heaviest pigs were removed and slaughtered 2 wk before the remainder of the group, which were slaughtered at the same time as the AO pigs. Pigs were fed a liquid diet from a long trough 3 times daily. Behavioral observations were conducted before and after SM, the day of SM, and 1 and 2 wk later. Behavior was recorded both during and between feed events, and skin lesions were scored on all, except the 3 pigs removed from SM groups before and 2 wk after SM. Growth performance, feed efficiency, and carcass traits were recorded. The number of aggressive interactions during feed events decreased after the 3 pigs were removed from SM groups. This reduction in aggressive interactions was observed on the day of SM in male groups (before SM: 24.3 vs. the day of SM: 14.7, SED = 3.31, P < 0.05 for interaction) and in subsequent observations in female groups (before SM: 21.4 vs. days after SM: 13.4, SED = 3.31, P < 0.05 for interaction). However, SM had no effect on behaviors recorded between feed events or on the number and severity of skin lesions (P > 0.10). There were no differences between the 11 remaining pigs in SM groups and the 14 pigs in AO groups in terms of growth performance, feed efficiency, and carcass traits of female or intact male pigs (P > 0.10). However, reduced within-pen CV in carcass weight was detected in pigs from SM groups compared with pigs from AO groups (8.6 vs. 10.9, SEM = 0.72, P < 0.05). Therefore, in restrictively fed pigs, a SM strategy improved the welfare of both female and intact male pigs by reducing aggressive interactions during feeding but had no effect on performance or carcass traits.