Abstract
BackgroundIron 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.ResultsA 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.ConclusionIron 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.
Highlights
Iron is an essential nutrient, and iron supplementation has been shown to reduce the incidence of abomasal bloat in lambs
The aims of our study were : (1) to map the use of iron supplementation in Norwegian sheep flocks based on a questionnaire survey, and (2) to investigate whether iron supplementation of young lambs reduces the uptake and excretion of Eimeria oocysts and increases lamb growth rates, potentially, reducing the need for treatment with anticoccidials
Iron supplementation was used by less than 10% of the sheep farmers responding to the questionnaire, and the purpose of treatment was mainly to prevent abomasal bloat, and coccidiosis
Summary
Iron is an essential nutrient, and iron supplementation has been shown to reduce the incidence of abomasal bloat in lambs. Iron deficiency is linked to pica, which may increase uptake of Eimeria oocysts. 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. Dietary deficiency in iron may lead to pica, i.e. ingestion of material other than normal food, including soil [13]. Pica in lambs on spring pasture, leading to ingestion of excessive amounts of soil, could potentially result in uptake of high numbers of Eimeria spp. oocysts as they can survive for at least 1 year in soil under Norwegian conditions [15]
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