Linear distribution of nematodes in the gastrointestinal tract of tracer lambs

Abstract

Forty-eight tracer lambs were killed in 2004-2007. The abomasum, duodenum, small intestine (jejunum and ileum), colon and caecum were collected and processed for parasites enumeration and identification-mucosal scrapings of both abomasums and intestines were digested. Out of 48 gastrointestinal tracts examined, all were found to be positive for nematode infection. Seventeen species of gastrointestinal nematodes were recovered: Bunostomum trigonocephalum, Cooperia curticei, Haemonchus contortus, Chabertia ovina, Nematodirus battus, Nematodirus filicollis, Oesophagostomum venulosum, Teladorsagia circumcincta, Trichostrongylus axei, Trichostrongylus colubriformis, Trichostrongylus vitrinus, Strongyloides papillosus, Trichuris ovis, Trichuris globulosa, Trichuris skrjabini and Skrjabinema ovis. All species were searched for in the entire gastrointestinal tract. Six species of nematodes were recovered from abnormal sites, naturally in small numbers of lambs as well as in small amounts: Nematodirus battus in the abomasums (6.67% of lambs), N. filicollis in the caecum and in the colon (%4 and 8%, respectively), T. axei in the colon (9.52%), T. colubriformis in the colon (13.89%), T. vitrinus in the caecum (16.67%), in the colon (20.00%) and in the abomasum (3.33%). T. ovis was found in one case in the small intestine.

Eprinomectin pour-on (EPRINEX® Pour-on, Merial): efficacy against gastrointestinal and pulmonary nematodes and pharmacokinetics in sheep

“…ovina . Both species of large intestinal nematodes under natural infection conditions frequently occur in co-infections [33, 34, 36, 45; this Study 2]. However, infection with Ch.…”

Bacterial communities in the gastrointestinal tract segments of helminth-resistant and helminth-susceptible sheep

“…Gastrointestinal helminth infection has a major economic impact in sheep industries worldwide—for example, for Australia in 2015, Meat and Livestock Australia estimated an annual loss of AUD436 million [ 1 ]. In the sheep of Western Australia, the major problem is infection during winter and early spring, with Teladorsagia circumcincta , found mainly in the abomasum, and Trichostrongylus colubriformis in the small intestine, particularly in the duodenum [ 2 , 3 ]. Clinical signs associated with high levels of T. circumcincta and T. colubriformis infection include loss of appetite, rapid weight loss, profuse watery diarrhoea and hypoproteinaemia [ 4 ].…”

Sequence variability in four mitochondrial genes amongBunostomum trigonocephalumisolates from four provinces in China

“…More importantly, some hookworms can also infect humans, causing ancylostomiasis which is a serious public health problem in some countries (Brooker et al , 2004; Hotez, 2008; Alemu et al , 2011). Hookworms of ruminants have a worldwide distribution (Borgsteede et al , 2000; Wang et al , 2006, 2012; Makovcová et al , 2008; Tariq et al , 2010). In China, the sheep and cattle hookworms Bunostomum trigonocephalum and B. phlebotomum are distributed nationwide (Wang et al , 2012), and adult hookworms attach to the mucosa of the small intestine and suck blood, causing considerable economic losses to the livestock industries throughout the country.…”