Conditioned food aversion to control poisoning by Ipomoea carnea subsp. fistulosa in goats

Ciência Rural

Carlos Alberto Oliveira Júnior¹  Gabriela Riet-correa¹  Carla Tavares¹  Elda Souza¹  Valíria Duarte Cerqueira¹  James Pfister¹  Daniel Cook¹  Franklin Riet-correa¹ 

关键词: poisonous plants;    swainsonine;    conditioned food aversion;    lithium chloride;    plantas tóxicas;    swainsonina;    aversão alimentar condicionada;    cloreto de lítio;   

DOI  :  10.1590/0103-8478cr20131445

来源: SciELO

【 摘 要 】

Ipomoea carnea is a toxic plant often ingested by livestock in Brazil. Three experiments were conducted to determine if conditioned food aversion was effective in reducing goats' consumption of I. carnea. In the first experiment, 10 mildly intoxicated goats that had been eating I. carnea were averted using LiCl (175 to 200mg kg-1 body weight). These intoxicated goats did not develop an aversion to I. carnea, demonstrating that the technique is not effective in goats that are already accustomed to consuming the plant. In the second experiment, 14 naïve goats were placed in a pasture with I. carnea, and averted after they ingested the plant. In this group the aversion persisted until the end of the experiment, 2 years and 8 months after the initial aversion. In another experiment, 20 goats were placed in a pasture with I. carnea, and after consuming the plant were averted with LiCl. The averted goats were transferred to Marajo Island and periodically observed over a 2 year period at 2-3 month intervals to determine if they were still averted. The averted goats did not ingest the plant while grazing in the pasture, whereas in 6 neighboring goat farms the prevalence of intoxication from I. carnea poisoning was estimated to be about 40%. These results demonstrated the efficacy of conditioned food aversion to avoid ingestion of I. carnea in formerly naïve goats that had only recently begun to ingest the plant.

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