Lynegaard J C, Larsen I, Hansen C F, Nielsen J P, Amdi C
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Grønnegårdsvej 2, DK-1870 Frederiksberg C, Copenhagen, Denmark.
Danish Pig Research Centre SEGES, Danish Agriculture and Food Council, Axeltorv 3, DK-1609, Copenhagen V, Denmark.
Porcine Health Manag. 2021 Feb 17;7(1):18. doi: 10.1186/s40813-021-00198-y.
Antibiotic (AB) consumption in production animals has a high awareness among politicians and consumers due to the risk of selection for AB resistance among potentially zoonotic bacteria. However, AB treatment of animals is at times necessary to treat diseases and ensure the wellbeing of the animals we take into our care. Raised without antibiotics (RWA) is a concept where pigs are individually ear-tagged for tracking, and if pigs are AB treated, they lose their RWA status. At slaughter, the farmer receives an additional price for non-AB treated pigs. The objective of this study was to identify risk factors for AB treatment and to investigate growth performance of pigs in two Danish RWA herds.
A total of 518 pigs in herd A and 436 pigs in herd B, were individually ear-tagged and subjected to weekly investigations of AB treatment status from birth to 12 weeks of age. Bodyweight was recorded at birth, 2, 4 and 12 weeks of age. The results showed, that at 12 weeks of age, 82 of 518 liveborn pigs were AB treated in herd A and 31 of 436 liveborn pigs were AB treated in herd B. Individual pigs that required AB treatment had a reduced average daily gain from day 0 to 28 in both herds (herd A, P < 0.001; herd B, P = 0.062) and from day 0 to 84 in herd A (P < 0.001). Additionally, significant risk factors for AB treatment were identified as a low bodyweight in herd A, whereas barrows and litters with less than 19 piglets were the main risk factors in herd B.
The results suggests that in order to reduce AB treatments particular attention should be addressed to smaller pigs and barrows in RWA herds. In these two Danish RWA herds from this study it was possible for 64 and 68% pigs to reach 12 weeks of life without any AB treatments.
由于在潜在人畜共患病细菌中存在抗生素耐药性选择风险，生产动物中抗生素的使用引起了政治家和消费者的高度关注。然而，有时有必要对动物进行抗生素治疗以治疗疾病并确保我们所照料动物的健康。无抗生素饲养（RWA）是一种概念，即猪被单独耳标标记以便追踪，如果猪接受了抗生素治疗，它们就会失去RWA状态。在屠宰时，农民会因未接受抗生素治疗的猪获得额外报酬。本研究的目的是确定抗生素治疗的风险因素，并调查丹麦两个RWA猪群中猪的生长性能。
A群共有518头猪，B群共有436头猪，均被单独耳标标记，并从出生到12周龄每周调查抗生素治疗状态。在出生、2周、4周和12周龄时记录体重。结果显示，在12周龄时，A群518头活产猪中有82头接受了抗生素治疗，B群436头活产猪中有31头接受了抗生素治疗。在两个猪群中，需要抗生素治疗的个体猪从第0天到第28天的平均日增重均降低（A群，P<0.001；B群，P=0.062），在A群中从第0天到第84天的平均日增重也降低（P<0.001）。此外，确定的抗生素治疗的重要风险因素在A群中是体重低，而在B群中去势公猪和仔猪数量少于19头的窝是主要风险因素。
结果表明，为了减少抗生素治疗，应特别关注RWA猪群中的小猪和去势公猪。在本研究的这两个丹麦RWA猪群中，分别有64%和68%的猪在未接受任何抗生素治疗的情况下活到了12周龄。
