Department of Animal Science, Faculty of Science and Technology, Aarhus University, P.O. Box 50, DK-8830 Tjele, Denmark.
Res Vet Sci. 2012 Oct;93(2):936-42. doi: 10.1016/j.rvsc.2011.10.014. Epub 2011 Nov 17.
The aim of the present study was to investigate if adult mink females characterised as having a high or low residual feed intake (RFI) differed in their response to feed restriction with regard to activity, body weight loss and physiological parameters. For RFI-High, the activity was higher prior to the expected feeding time both in the cases of restrictive and ad libitum feeding indicating a changed RFI-High feeding motivation and a higher risk of developing stereotypic activity. The body weight gain and the feed consumption were higher for RFI-High than for RFI-Low when feeding ad libitum indicating that RFI-High has a higher growth potential and/or a higher energy requirement than RFI-Low. Signs of immunosuppression were shown in connection with restrictive feeding compared to ad libitum feeding, and RFI-High females seemed to be more susceptible to immunosuppression than RFI-Low females. Based on the present results, mink characterised as RFI-Low would be preferable as breeders because they involve lower feed costs and seem to be less susceptible to immunosuppression. They also seem to have less risk of developing stereotypic activity, which is beneficial for the welfare.
本研究旨在探讨具有高或低剩余采食量（RFI）特征的成年水貂雌性在活动、体重减轻和生理参数方面对饲料限制的反应是否存在差异。对于 RFI-高，无论是在限制和自由采食的情况下，在预期进食时间之前，活动水平都更高，这表明 RFI-高的采食动机发生了变化，并且出现刻板行为的风险更高。与 RFI-低相比，当自由采食时，RFI-高的体重增加和饲料消耗更高，这表明 RFI-高比 RFI-低具有更高的生长潜力和/或更高的能量需求。与自由采食相比，限制采食时会出现免疫抑制的迹象，并且 RFI-高的雌性似乎比 RFI-低的雌性更容易受到免疫抑制的影响。基于目前的结果，RFI-低的水貂作为繁殖者更为理想，因为它们的饲料成本较低，并且似乎不易受到免疫抑制的影响。它们似乎也较少出现刻板行为的风险，这对福利有益。
