Tehran University of Medical Sciences Iranian Journal of Parasitology 1735-7020 11 4 2016 12 25 559 567 Adekayode Olarinwaju SONIBARE Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, Federal University of Agriculture, Abeokuta, Abeokuta, Ogun State, Nigeria Olusiji Sunday SOWANDE Department of Animal Production and Health, College of Animal Science and Livestock Production, Federal University of Agriculture, Abeokuta, Abeokuta, Ogun State, Nigeria Shamusideen Oladeinde IPOSU Department of Animal Production and Health, College of Animal Science and Livestock Production, Federal University of Agriculture, Abeokuta, Abeokuta, Ogun State, Nigeria Joshua LUKA Department of Veterinary Microbiology and Parasitology, Faculty of Veterinary Medicine, University of Maiduguri, Maiduguri, Borno State, Nigeria Michael AYANKOSOI Department of Animal Production and Health, College of Animal Science and Livestock Production, Federal University of Agriculture, Abeokuta, Abeokuta, Ogun State, Nigeria Adeniyi Olugbega EGBETADE Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, Federal University of Agriculture, Abeokuta, Abeokuta, Ogun State, Nigeria 2016 12 25 2016 12 25 Background: The performance and parasitology of semi-intensively managed West African dwarf (WAD) lambs were evaluated following exposure to gastrointestinal helminth infected paddock and varied protein-energy feeds. Methods: Twenty four lambs obtained from the Department of Animal Breeding and Genetics and brought to Directorate of University farm (DUFARM) of Federal University of Agriculture Abeokuta, Ogun state, Nigeria, where the research was carried out in 2014, were grouped into four each containing six animals based on different energy-protein feed combination thus; group 1(G1) low energy low protein, group 2 (G2) low energy high protein, group 3 (G3) high energy low protein and group 4 (G4) high energy high protein. Experimental animals were supplemented with concentrate feed after grazing on daily in a nematode infected paddock. Clinical signs of infection were monitored. Live weight, faecal egg count (FEC), worm counts, packed cell volume (PCV), haemoglobin concentration (Hb) and red blood cell count (RBC) were determined using standard methods. Results: Anorexia and intermittent diarrhea were the observed signs. Worm counts did not differ significantly (P=0.309) among the groups. The weight and FEC differed significantly (P˂0.05) across the days and among the groups, while haematological parameters increased significantly (P˂0.05) across the days and among the groups. Conclusion: Lambs in G2 followed by G4 showed improved parameters and superior performance when compared to the other groups. It is therefore recommended that feed high in protein content is capable of mitigating deleterious effect of gastrointestinal helminth parasitism. https://ijpa.tums.ac.ir/index.php/ijpa/article/view/1356 https://ijpa.tums.ac.ir/index.php/ijpa/article/download/1356/634