D N Karanja

The prevalence of gastrointestinal helminth infections in pigs in Kenya

The prevalence of helminth infection, species spectrum and worm burdens in Kenyan pigs was examined. A total of 115 gastrointestinal tracts (GIT) from 61 growers and 54 adult pigs were examined between February 2005 and January 2006. Seventy eight (67.8%) had one or more helminth parasites, of which thirty six (31.3%) were mixed infection. Ten types of helminth parasites encountered in descending order of prevalence were, Oesophagostomum dentatum (39.1%), Trichuris suis (32.2%), Ascaris suum (28.7%), Oesophagostomum quadrispinulatum (14.8%), Trichostrongylus colubriformis (10.4%), Trichostrongylus axei (4.3%), Strongyloides ransomi (4.3%), Hyostrongylus rubidus (1.7%), Ascarops strongylina (1.7%) and Physocephalus sexalutus (0.9%). Oesophagostomum dentatum was the most prevalent species (51.9%) in the adult pigs, while Trichuris suis was the most prevalent species (44.3%) in growers. The highest worm counts were recorded in the out door production system. Oesophagostomum quadrispinulatum, Trichostrongylus colubriformis, Trichostrongylus axei, Hyostrongylus rubidus, Ascarops strongylina and Physocephalus sexalutus were recorded in Kenya for the first time. The high prevalence and wide spectrum observed in the present study suggests that helminth infection may be a constraint to economic pig production in the country and there is need to institute control measures.

Prevalence, pathology and risk factors for coccidiosis in domestic rabbits (Oryctolagus cuniculus) in selected regions in Kenya

Background: The potential for rabbit production in Kenya is high. However, high morbidity and mortality of domestic rabbits were reported. Objective: The aim of the study was to determine the pathology, prevalence and the predisposing factors to coccidiosis in domestic rabbits in selected regions in Kenya. Animals and methods: A total of 61 farms keeping rabbits in six different counties were visited in the survey. A total of 2680 live rabbits were examined and 61 rabbits and 302 fecal samples were randomly collected from the farms and examined for coccidian oocysts by ante-mortem and post-mortem methods. The predisposing factors to coccidiosis were assessed through questionnaires and direct observation. Chi square (χ2) statistics was used with P values < 0.05 considered statistically significant. Results: Of the 302 fecal samples, 85% (P < 0.001) contained coccidian oocysts and 2% harbored nematode eggs (Passalurus ambiguous). The overall prevalence of Eimeria spp. infestation was 85.1% in the study area and 90.2% in the individual rabbits, while prevalence of intestinal coccidiosis and hepatic coccidiosis was 29.5% and 11.5%, respectively. Higher counts of coccidian oocysts per gram of feces were recovered in weaners than in growers and adults rabbits (P < 0.001), rabbits that were kept in high density group housing (P < 0.05) and housing with more than two tiers. Conclusion: This study identified group housing of rabbits of different ages and inadequate control of concurrent infections as the major risk factors associated with coccidiosis in domestic rabbits in Kenya.

Donkey klossiellosis in Kenya

Out of eight donkeys examined, two had gametogonic and sporogonic stages of Klossiella equi in their kidneys. Gametogonic stages included microgametocytes and macrogametocytes, some of them in syzygy. They were found in enlarged parasitophorous vacuoles situated in epithelial cells of the renal tubules. Sporonts were seen in the epithelial cells protruding into the tubular lumen while sporoblasts, sporocysts and sporozoites were found freely in the tubular lumen. Entire sporocysts were rarely encountered but sporozoites liberated from the ruptured sporocysts could be seen. No inflammatory reaction could be attributed to the presence of these parasites.

Diffuse Peritonitis Associated With Ventral Hernia In An Adult Doe: Case Report

A case of diffuse fibrino-purulent peritonitis associated with ventral abdominal hernia is reported in an adult non-descript doe. The affected animal was noticed to have developed a swelling on the left ventro- lateral aspect of the abdomen a day after parturition and inappentance two weeks later. Clinical examination revealed dyspnea, dullness and shivering. The rectal temperature was 37.2 o C and respiratory rate 42 breathes per minute. There was a swelling on left ventral abdomen with a palpable ring at its base. Ultrasonography confirmed the presence of intestinal loops in the swelling and hematology revealed severe leukocytosis, lymphopenia and decreased hematocrit. Initial medical management was undertaken for five days before herniorrhaphy. Celiotomy revealed one liter of straw-colored peritoneal fluid, extensive intra-abdominal adhesions and diffuse fibrin formation with multiple pockets of pus. Despite aggressive efforts to manage this condition, the animal died four hours after surgery. Autopsy revealed purulent exudates in the subcutis and abdominal muscles peripheral to the corrected ventral hernia.

Clinical, Haematological, Biochemical and Pathological Manifestations of Sub-Acute Toxicity of Nicandra Physaloides (L) Gaertn in Calves

Muthee, J K; Mbaria, J M; Thaiyah, A G; Karanja, D N; Gakuya, D W