Social behaviour and transmission of lameness in a flock of ewes and lambs.
Social behaviour and transmission of lameness in a flock of ewes and lambs.
复制标题
DOI：
10.3389/fvets.2022.1027020
复制
发表时间：
2022
影响因子：
3.2
通讯作者：
Green, Laura E.
中科院分区：
文献类型：
--
作者：
Lewis, Katharine E.;Price, Emily;Croft, Darren P.;Langford, Joss;Ozella, Laura;Cattuto, Ciro;Green, Laura E.
绵羊有异质的社会联系，影响一些传染病的传播。蹄病是全球五大绵羊重要疾病之一，它由结节叉蹄病引起，当感染性足污染表面时在绵羊之间传播，例如，牧场根据表面的湿度水平，表面的感染性持续几分钟到几天。与传染性绵羊密切接触的易感绵羊可能有被感染的风险，因为它们很可能踩上传染性足迹，特别是当它们聚集在一起时，母畜和羔羊。在英国德文郡的一个地方性蹄病群中，对40只母羊和54只5-27日龄的羔羊部署了高分辨率接近传感器，持续13天。每天使用0-6整数量表对绵羊运动进行评分。当绵羊的运动评分（LS）≥2时，将其定义为跛行，跛行病例定义为LS ≥2持续≥2天。32只绵羊（19只母羊，9只单羔和4只双羔）在研究期间跛行，而14只（5只母羊，5只单羔和4只双羔）最初跛行。这46只羊来自29个家系，其中14个家系有1只以上的跛羊，且从母羊到羔羊的传播是双向的。至少有15%的新病例的蹄病是从家庭内传播，跛行的发生率高于双胞胎羔羊。至少4%的传播是由于鸡群之间的密切接触。大多数密切接触发生在家庭内部。单羔和双羔分别与母鼠在一起的时间为1.5和0.9小时/天，双羔在一起的时间为3.7小时/天。非家庭绵羊每天只花0.03小时与人接触。跛脚单羊和母羊花更少的时间与非家庭羊，跛脚双胞胎羔羊花更少的时间与家庭羊。我们的结论是，大多数传播跛行是不属于密切接触。然而，在母羊与年轻的羔羊，一些传播发生在家庭内，很可能是由于时间花费在密切接触，因为单羔羊花更多的时间与他们的母亲比双胞胎羔羊，更有可能成为跛脚。
Sheep have heterogenous social connections that influence transmission of some infectious diseases. Footrot is one of the top five globally important diseases of sheep, it is caused by Dichelobacter nodosus and transmits between sheep when infectious feet contaminate surfaces, e.g., pasture. Surfaces remain infectious for a few minutes to a few days, depending on surface moisture levels. Susceptible sheep in close social contact with infectious sheep might be at risk of becoming infected because they are likely to step onto infectious footprints, particularly dams and lambs, as they cluster together. High resolution proximity sensors were deployed on 40 ewes and their 54 lambs aged 5–27 days, in a flock with endemic footrot in Devon, UK for 13 days. Sheep locomotion was scored daily by using a 0–6 integer scale. Sheep were defined lame when their locomotion score (LS) was ≥2, and a case of lameness was defined as LS ≥2 for ≥2 days. Thirty-two sheep (19 ewes, 9 single, and 4 twin lambs) became lame during the study, while 14 (5 ewes, 5 single, and 4 twin lambs) were lame initially. These 46 sheep were from 29 family groups, 14 families had >1 lame sheep, and transmission from ewes to lambs was bidirectional. At least 15% of new cases of footrot were from within family transmission; the occurrence of lameness was higher in single than twin lambs. At least 4% of transmission was due to close contact across the flock. Most close contact occurred within families. Single and twin lambs spent 1.5 and 0.9 hours/day with their dams, respectively, and twin lambs spent 3.7 hours/day together. Non-family sheep spent only 0.03 hours/day in contact. Lame single lambs and ewes spent less time with non-family sheep, and lame twin lambs spent less time with family sheep. We conclude that most transmission of lameness is not attributable to close contact. However, in ewes with young lambs, some transmission occurs within families and is likely due to time spent in close contact, since single lambs spent more time with their dam than twin lambs and were more likely to become lame.
登录
查看更多内容
影响因子：
4.6
作者：
Chen S;White BJ;Sanderson MW;Amrine DE;Ilany A;Lanzas C
通讯作者：
Lanzas C
影响因子：
2.6
作者：
Fielding HR;Silk MJ;McKinley TJ;Delahay RJ;Wilson-Aggarwal JK;Gauvin L;Ozella L;Cattuto C;McDonald RA
通讯作者：
McDonald RA
影响因子：
0.8
作者：
EGERTON, JR;ROBERTS, DS;PARSONSON, IM
通讯作者：
PARSONSON, IM
影响因子：
3.3
作者：
Moore, LJ;Wassink, GJ;Grogono-Thomas, R
通讯作者：
Grogono-Thomas, R
影响因子：
2.3
作者：
Galeana, Lucia;Orihuela, Agustin;Vazquez, Reyes
通讯作者：
Vazquez, Reyes