Influence of diet on the occurrence of intraepithelial microabscesses and foreign bodies in the ruminal mucosa of reindeer calves (Rangifer tarandus tarandus).

T D Josefsen, T H Aagnes, S D Mathiesen
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Abstract

The forestomach mucosa was examined for pathological lesions in 12 healthy free-ranging reindeer calves at different seasons, and in 32 reindeer calves fed lichen (n = 3), baled grass silage (n = 24) or pelleted feed (n = 5). No gross lesions were seen. Samples for histology were taken from reticulum, omasum and four sites in rumen. In histological sections a total of 182 intraepithelial microabscesses (IEMAs) and 16 foreign body lesions (FBLs) were observed in the ruminal mucosa, while 1 IEMA was found in omasum and no lesions in reticulum. The number of animals having 0, 1-10, 11-20 and > 20 IEMAs per four ruminal sections (one from each sample site) was 19, 19, 5 and 1, respectively. None of the free-ranging or lichen-fed animals had more than 1 IEMA per four ruminal sections, while 58% (14/24) of the animals fed silage and 40% (2/5) of the animals fed pelleted feed had 2 or more IEMAs per 4 ruminal sections. FBLs occurred more frequently in animals with high numbers of IEMAs, and it is suggested that both IEMAs and FBLs are caused by plant particles penetrating the ruminal epithelium. The lesions did not seem to indicate an inferior diet nor influence the health of the animals.

日粮对驯鹿犊牛瘤胃黏膜上皮内微脓肿和异物发生的影响
对12头健康散养驯鹿犊牛在不同季节和32头饲喂地衣(n = 3)、草包青饲料(n = 24)和颗粒饲料(n = 5)的前胃粘膜进行病理检查,未见明显病变。组织学标本取自网状、瓣胃和瘤胃的四个部位。组织学切片显示,瘤胃黏膜上皮内微脓肿182例,异物病变16例,瓣胃上皮内微脓肿1例,网状未见病变。每4个瘤胃切片(每个样本部位各1个)iema值为0、1 ~ 10、11 ~ 20和> 20的动物分别为19、19、5和1只。自由放养或地衣饲养的动物每4个瘤胃切片的IEMA均不超过1个,而青贮饲料的58%(14/24)和颗粒饲料的40%(2/5)的动物每4个瘤胃切片的IEMA均不超过2个。在IEMAs数量较多的动物中,FBLs发生的频率更高,这表明IEMAs和FBLs都是由植物颗粒穿透瘤胃上皮引起的。这些损伤似乎并不表明饮食不佳,也不影响动物的健康。
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