Sheep are more resistant than cattle to larkspur poisoning and thus may be used as a biological tool to graze larkspur to reduce cattle poisoning. Sheep readily graze larkspur in its mature stages, but if they are to be an effective management tool, they must graze it in the early growth stages before cattle enter the allotment. The objective of this study was to determine if sheep could be positively conditioned to graze duncecap larkspur (Delphinium occidentale (S.Wats) S. Wats) early in its growth stages. Eighteen ewes were divided into 3 groups of 6 ewes each. During conditioning, group 1 was offered potted larkspur plants then were gavaged with glucose, the second group was exposed to larkspur plants together as a group (social facilitation), and the third group was an untreated control. In the preference test, the glucose group ate more duncecap larkspur than the social facilitation and control groups. The glucose and control groups were taken to duncecap larkspur-infested mountain rangeland to test the conditioning. In the field grazing trial, the glucose group consumed more larkspur than the control group, but it occurred later in the grazing trial when larkspur was in flower and after desirable forages had been consumed. High levels of diterpenoid alkaloids in larkspur and other alternative palatable forages may have caused ewes to reject larkspur at the beginning of the trial. The sheep were positively conditioned to graze larkspur, but the amount consumed and the timing of consumption was not sufficient to prevent potential cattle poisoning. ResumenLos ovinos son más resistentes que los bovinos a la intoxicació n por ''Larkspur'', por lo que pueden ser usados como una herramienta bioló gica para apacentar el ''Larkspur'' y reducir la intoxicació n del ganando bovino. Los ovinos son capaces de apacentar ''Larkspur'' en sus etapas maduras, pero si ellas van a ser una herramienta efectiva de manejo, ellos deben apacentar el ''Larkspur'' en las etapas iniciales de crecimiento, antes de que el ganado bovino entre al potero. El objetivo de este estudio fue determinar si los ovinos pudieran ser acondicionados positivamente para apacentar el ''Duncecap larkspur'' (Delphinium occidentale (S.Wats) S. Wats) en las etapas iniciales de crecimiento. Un grupo de 18 borregas se dividió en tres grupos de seis animales cada uno. Durante el acondicionamiento, al grupo 1 se le ofreció plantas de ''Larkspur'' en recipientes las cuales fueron adicionadas con glucosa, en el segundo grupo todos los animales fueron expuestos juntos a plantas de ''Larkspur'' (Facilitació n social) y el tercer grupo fue el control sin tratamiento. En la prueba de preferencia, el grupo con glucosa comió má s ''Duncecap larkspur'' que los grupos de facilitació n social y testigo. Los grupos de glucosa y testigo se llevaron a un pastizal montano infestado con ''Duncecap larkspur'' para evaluar el acondicionamiento. En la prueba de apacentamiento en campo. El grupo con glucosa consumió má s ''Larkspur'' que el grupo control, pero esto ocurr...
Certain lupines (Lupinus spp.) contain alkaloids that cause contracture
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