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Horses’ rejection behaviour towards the presence of Senecio jacobaea L. in hay
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Horses’ rejection behaviour towards the presence of Senecio jacobaea L. in hay
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Journal Article
Horses’ rejection behaviour towards the presence of Senecio jacobaea L. in hay
2022
Overview
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.
