Two feeding preference experiments and an in vitro assay were performed to assess the weaned pig preference for Cu doses and sources based on their sensorial perception and on the likely post-ingestive effects of Cu. At day 7 post-weaning, a total of 828 pigs were distributed into two different experiments. In Exp.1 (dose preference) a diet with a nutritional Cu level (15 mg/kg) of Cu sulfate (SF) was pair offered with higher Cu levels (150 mg/kg) of either SF or hydroxychloride (HCl). In Exp.2 (source preference), a diet supplemented with Cu-SF at 150 mg/kg was compared to a Cu-HCl (150 mg/kg) diet. At the short-term (day 7–9) and for the entire experimental week (day 7–14), pigs preferred diets with a high Cu level than with Cu at a nutritional dose (p < 0.05). Likewise, pigs preferred diets supplemented with a Cu-HCl source compared to diets with Cu-SF (p < 0.05). In vitro assay results showed a greater solubility and interaction of Cu-SF with phytic acid compared to Cu-HCl. In conclusion, pigs chose diets with higher levels of Cu probably to re-establish homeostasis after weaning. Pigs preferred diets with Cu-HCl compared to Cu-SF probably due to their solubilities and chemical differences.

中文翻译：

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根据不同溶解度特性的铜含量和来源，新断奶仔猪的日粮偏好和营养物质相互作用。


进行了两次饲喂偏好实验和一项体外测定，以根据断奶猪的感官知觉和铜摄入后可能的影响评估断奶猪对铜剂量和来源的偏好。断奶后第 7 天，总共 828 头猪被分配到两个不同的实验中。在实验1（剂量偏好）中，将营养铜含量（15毫克/千克）硫酸铜（SF）的饮食与较高铜含量（150毫克/千克）的SF或羟基氯化物（HCl）配对。在实验 2（来源偏好）中，将添加 150 mg/kg Cu-SF 的饮食与添加 Cu-HCl (150 mg/kg) 的饮食进行比较。在短期（第 7-9 天）和整个实验周（第 7-14 天），猪更喜欢高铜含量的日粮，而不是营养剂量铜的日粮 ( p < 0.05)。同样，与添加 Cu-SF 的日粮相比，猪更喜欢添加 Cu-HCl 源的日粮 ( p < 0.05）。体外测定结果显示，与 Cu-HCl 相比，Cu-SF 具有更大的溶解度以及与植酸的相互作用。总之，猪选择铜含量较高的日粮可能是为了在断奶后重新建立体内平衡。与 Cu-SF 相比，猪更喜欢含 Cu-HCl 的日粮，这可能是因为它们的溶解度和化学差异。