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In the present research, two studies were performed to determine the effects of specific botanical compounds (BCs) on the innate feed preference and feed intake of piglets, as follows: Exp. 1 studied the innate feed preferences of post-weaning piglets using a double-choice feeding test. A total of 828 weaned piglets were distributed into 36 pens (23 pigs/pen) and assigned to three dietary pair choice feeding options ( n = 12): unsupplemented prestarter diets (reference) versus reference plus D-limonene, trans -anethole, or eucalyptol. Piglets showed a preference for diets with D-limonene (53.8%) and trans -anethole (54.5%), and an aversion to eucalyptol (41.6%) ( p &lt; 0.05). Exp. 2 studied whether the prenatal and perinatal exposure to D-limonene, trans -anethole, and eucalyptol influences the feed intake and growth of newly-weaned piglets. Twenty-eight gestating and lactating sows were distributed into two dietary treatments ( n = 14): unsupplemented Control diets or Control plus a blend of BCs (BBC; containing D-limonene, trans -anethole, and eucalyptol). D-limonene, trans -anethole, and eucalyptol were transferred into the placental fluid, and D-limonene and trans -anethole into the milk ( p &lt; 0.05). Furthermore, weanling piglets ( n = 200; Control) and ( n = 203; BBC) received the same treatment as their mothers in prestarter diets. The early response after weaning showed that piglets' post-weaning BW gain was higher in the Control ( p &lt; 0.05) group than in those exposed to BBC. In conclusion, prenatal exposure to preferred D-limonene and trans -anethole, or familiarity to eucalyptol did not help to overcome the innate aversion to eucalyptol and its negative effect on weanling piglets' BW.

animals

Prenatal Exposure to Innately Preferred D-Limonene and Trans-Anethole Does Not Overcome Innate Aversion to Eucalyptol, Affecting Growth Performance of Weanling Piglets