Horses’ rejection behaviour towards the presence of Senecio jacobaea L. in hay

Background Senecio jacobaea contains pyrrolizidine alkaloids that can induce severe hepatic intoxication in horses, either acute when ingested in high amounts or chronic when consumed over a long period. The aim of this study was to determine horses’ rejection behaviour towards the presence of Senecio jacobaea in hay when fed ad libitum. We hypothesized that adult horses can sort Senecio jacobaea out of the contaminated hay when hay is fed ad libitum. Six warmblood geldings with a mean (±SD) age of 15 ± 2 years were included. In a randomized study, Senecio jacobaea contaminated hay (5% or 10% contamination level) was provided at several timepoints over the day for 1 hour to six. Hay was provided ad libitum for the rest of the day. The horses’ rejection behaviour towards Senecio jacobaea was observed. If a horse ingested two Senecio jacobaea plants twice at different timepoints, then the horse was excluded from the experiment. Results Two out of six horses had to be excluded from the study after three out of 12 observation periods due to repeated Senecio jacobaea intake. Two other horses had to be excluded after nine and 11 out of 12 observation periods. Only two horses were able to sort out the various amounts (5 and 10% contamination level) of Senecio jacobaea during the whole experiment. Conclusions Horses’ intake of Senecio jacobaea cannot be avoided despite being fed with hay ad libitum. Due to the risk of chronic intoxication by pyrrolizidine alkaloids intake, feeding Senecio jacobaea contaminated hay must be avoided, and pastures with Senecio jacobaea growth are considered inappropriate for feed production.

La hierba de Santiago, Jacobaea vulgaris Gartn., en textos botánicos árabes andalusíes: Observaciones fitonímicas y etimológicas

El fitónimo andalusí trāšnah, que Ibn al-Bayṭār citaba tomándolo de al-Ġāfiqī, no había sido aún identificado desde que Lucien Leclerc (1877, 1881, 1883) lo tradujera al francés. Su presencia en la ˁUmdat aṭ-ṭabīb de Abū l-Ḫayr al-ˀIšbīlī, probable fuente de al-Ġāfiqī, con descripciones y sinonimia más extensas, no sólo ha facilitado su identificación como Jacobaea vulgaris Gaertn. [= Senecio jacobaea L.], sino que, además, los datos léxicos nuevos aclaran otras conexiones etimológicas.