Submitted to: Journal of Animal Science
Publication Type: Peer reviewed journal
Publication Acceptance Date: 5/28/2004
Publication Date: 9/1/2004
Citation: Lopez-Ortiz, S., Panter, K.E., Pfister, J.A., Launchbaugh, K. 2004. The effect of body condition on disposition of alkaloids from silvery lupine (lupinus argenteus pursh) in sheep1. Journal of Animal Science. Interpretive Summary: Lupines are poisonous to livestock and cause crooked calf disease when pregnant cows ingest certain species during the first trimester of pregnancy. Nutritional status and overall body condition may have an important impact on how livestock process and eliminate natural toxins ingested from poisonous plants. Sheep in two different body conditions (average and low) were fed Lupinus argenteus with know amounts of alkaloids. Sheep in average body condition were able to eliminate the alkaloid more rapidly and uptake of the alkaloids was slower than in sheep of lower body condition. Therefore, body condition is important in how animals cope with lupine toxicity. Animals in low body condition appear to be more at risk of poisoning from lupines than animals in average or high body condition.
Technical Abstract: Several species of lupine (Lupinus spp.) are poisonous to livestock, producing death in sheep and 'crooked calf disease' in cattle. Range livestock cope with poisonous plants through learned foraging strategies or mechanisms affecting toxicant disposition. When a toxic plant is eaten, toxicant clearance may be influenced by the animal's nutritional and/or physiological status. This research was conducted to determine whether differences in body condition or short-term nutritional supplementation of sheep altered the disposition of lupine alkaloids given as a single oral dose of ground silvery lupine (Lupinus argenteus) seed. Ewes in average body condition (ABC, n = 9) and low body condition (LBC, n = 10) received a single dose of ground lupine seeds including pods (8.5 g/kg BW) via gavage on the first day of the experiment, and were then randomly assigned to one of two nutritional supplement treatments. Blood samples were taken 0 to 60 h after dosing to compare blood alkaloid concentration and to evaluate alkaloid absorption and elimination profiles. Concentrations of total alkaloid and anagyrine, 5, 6, dehydrolupanine, lupanine, and alkaloid E were measured in serum. These four alkaloids constituted 78 and 75% of the total alkaloid concentration in serum for LBC vs. ABC groups, respectively. Initial analysis indicated that short-term supplementation had no effect on alkaloid disposition, and supplementation was removed from the statistical model. The highest concentration of total alkaloids was observed 2 h after dosing. Overall, serum total alkaloids was observed 2 h after dosing. Overall, serum total alkaloid and anagyrine levels (are under the curve) were higher (P, <.01) for sheep in the LBC group. Serum peak concentrations of total alkaloid and anagyrine were higher in LBC vs. ABC groups (P < 0.05). Serum elimination of anagyrine, unknown alkaloid E, and lupanine was decreased in LBC vs. ABC treatments (P < 0.05). These results demonstrate that body condition is important in the disposition of lupine alkaloids; however, further research is needed to determine the potential benefit, if any, that short-term nutritional supplementation might have on alkaloid disposition.