Excretion of Eimeria spp. oocysts in young lambs following iron supplementation.

Autor: Odden A; Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Kyrkjevegen 332/334, 4325, Sandnes, Norway. ane.odden@nmbu.no., Vatn S; Animalia Norwegian Meat and Poultry Research Centre, P.O. Box 396 Økern, 0513, Oslo, Norway., Ruiz A; Department of Animal Pathology, Faculty of Veterinary Medicine, University of Las Palmas de Gran Canaria, Arucas, 35416, Las Palmas, Spain., Robertson LJ; Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, P.O. Box 8146 Dep, 0033, Oslo, Norway., Enemark HL; Department of Animal Health and Food Safety, Norwegian Veterinary Institute, Ullevålsveien 68, P.O. Box 750 Sentrum, 0106, Oslo, Norway., Nes SK; Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Kyrkjevegen 332/334, 4325, Sandnes, Norway., Tømmerberg V; Animalia Norwegian Meat and Poultry Research Centre, P.O. Box 396 Økern, 0513, Oslo, Norway., Stuen S; Department of Production Animal Clinical Sciences, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Kyrkjevegen 332/334, 4325, Sandnes, Norway.
Jazyk: angličtina
Zdroj: Acta veterinaria Scandinavica [Acta Vet Scand] 2018 Aug 29; Vol. 60 (1), pp. 49. Date of Electronic Publication: 2018 Aug 29.
DOI: 10.1186/s13028-018-0404-6
Abstrakt: Background: Iron is an essential nutrient, and iron supplementation has been shown to reduce the incidence of abomasal bloat in lambs. Additionally, iron deficiency is linked to pica, which may increase uptake of Eimeria oocysts. Coccidiosis in sheep, caused by Eimeria spp., is an important infection, leading to reduced welfare and economic losses. The aims of our study were to investigate: (1) the use of iron supplementation in Norwegian sheep flocks using a questionnaire survey, and (2) whether iron supplementation reduced excretion of Eimeria oocysts and increased the growth rates of young lambs.
Results: A questionnaire regarding the use of iron supplementation, sent to all members of the Norwegian Sheep Recording System (n = 4993), showed that 152/1823 farmers iron-supplemented lambs, either orally (56.7%) or by injection (43.3%). The main purpose of supplementation was to prevent abomasal bloat (38.4%), coccidiosis (9.3%), or both (27.8%). In the field study, 102 twin lambs from five flocks were included: one twin (treated) received 600 mg of gleptoferron subcutaneously within 3 days of birth, whereas the control was given saline. McMaster analysis of individual faecal samples obtained at weekly intervals (n = 4 per lamb, starting at turnout) showed no significant difference in oocyst excretion between treatment groups at any sampling, except for one flock 14 days after turnout. Mean growth rates, measured at iron injection, 21 days after turnout, and in the autumn, differed significantly between treated and untreated lambs from iron injection to 21 days after turnout, however, no difference in growth rates was observed in the overall period from iron injection to autumn. Blood analysis suggested that the controls were at risk of developing iron deficiency anaemia during the housed period, but signs of anaemia were not observed.
Conclusion: Iron supplementation of lambs was used by 8.3% of the farmers responding to the questionnaire, mainly with the intention to prevent abomasal bloat, coccidiosis, or both. The field trial results indicate that iron supplementation of young lambs do not reduce oocyst excretion and only induced a transitory increase in weight gain. However further studies, including more flocks and possibly repeated iron injections, would provide more definitive information.
Databáze: MEDLINE
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