Sugar and protein are the major macronutrients＇ sources, and their balanced intake is important for animal＇s health. It has been observed that animals are able to change food preference in an imbalanced nutritional ...Sugar and protein are the major macronutrients＇ sources, and their balanced intake is important for animal＇s health. It has been observed that animals are able to change food preference in an imbalanced nutritional condition to selectively consume nutrients that are deficient in the body （Dethier, 1976）. Early studies in both Drosophila and mouse have demonstrated that animals exhibit food rejection to imbalanced diets lacking essential amino acids （Hao et al., 2005; Bjordal et al., 2014）. Furthermore, the food preference change upon protein depri- vation has been characterized using a two choice assay in Drosophila （Ribeiro and Dickson, 2010; Vargas et al., 2010）. Different from protein food, sugar is the main energy source, and sugar deficiency severely affects animal survival （Lee et al., 2008）. However, whether animals adopt a strategy of fast food preference switch upon sugar deprivation had not been investigated, and the neural mechanisms underlying this behavior regulation remain poorly understood.展开更多
LED has shown great advantages in poultry husbandry.This study focused on the behavioral preferences and production performance of chicken broilers reared under unevenly distributed yellow LED light.Four pens were div...LED has shown great advantages in poultry husbandry.This study focused on the behavioral preferences and production performance of chicken broilers reared under unevenly distributed yellow LED light.Four pens were divided into two groups adopting respective maximum light intensities(MLIs,60 lx and 30 lx).Because of different distances from the installation position of the LED pipe,each pen was distributed with unevenly distributed light.Each pen consisted of four subzones indicated by their light intensities-high intensity(HI),medium intensity(MI),low intensity(LI)and weak intensity(WI).Four subzones were the same size and provided with a feeder and a drinker,respectively.The broilers moved freely across the four subzones.No significant differences in body weight(BW),uniformity of final BW and feed conversion ratio(FCR)were observed between the two experimental groups.However,greater feed intake and water intake were found in HI than those in other subzones.The drinking preference changed with age for four subzones and was more likely to appear at the later stage,despite substantial fluctuations within the replicates.The feeding preference was more constant than the drinking preference and appeared mainly at the early and middle stages of this study.These findings could provide implications for broiler production reared under unevenly distributed LED light condition.展开更多
The soaring popularity of Ice-and-Snow Tourism(IST)and the growing number of tourists pose challenges for destination managers,particularly in balancing attraction development with the maintenance of high-quality tour...The soaring popularity of Ice-and-Snow Tourism(IST)and the growing number of tourists pose challenges for destination managers,particularly in balancing attraction development with the maintenance of high-quality tourism experiences.Understanding tourist behavioral preferences is crucial for the effective utilization of ice-and-snow resources and targeted marketing strategies.However,differences in IST participants'behavioral preferences and influencing factors remain unclear.Taking northeast China as an example,this paper applies text clustering and image recognition techniques to analyze 43,063 pieces of user-generated content(UGC)related to IST.Notable disparities are identified in destination image perception as well as in the temporal and spatial distribution patterns of IST participants,including both tourists and local residents.These findings reveal potential links between the variations and general regional attributes in 41 cities.Overall,tourists tend to develop diverse travel patterns but show similar preferences during specific holiday periods.They tend to concentrate in popular destinations,with stronger perception of distinctive architectural and natural landmarks.In contrast,local residents,with little travel time,exhibit a more dispersed travel pattern,favoring short trips to lesser-known surrounding attractions.In addition,unexpected insights emerge from the coupled analysis of spatiotemporal characteristics related to the destination image.Among 16 regional attributes,most socio-economic factors are positively correlated with tourist distribution,whereas physical geographic factors show relatively weak correlations.Although tourists show a greater preference for well-developed tourism infrastructure,diverse experience offerings,and enhanced safety,they also have a greater appreciation for natural environments than local residents.These findings offer valuable insights for more human-centered IST planning,supporting the optimization of existing attractions to enhance their competitiveness and sustainability.展开更多
基金supported by the grants from the National Science Foundation of China(Nos. 91132709 and 31130027)
文摘Sugar and protein are the major macronutrients＇ sources, and their balanced intake is important for animal＇s health. It has been observed that animals are able to change food preference in an imbalanced nutritional condition to selectively consume nutrients that are deficient in the body （Dethier, 1976）. Early studies in both Drosophila and mouse have demonstrated that animals exhibit food rejection to imbalanced diets lacking essential amino acids （Hao et al., 2005; Bjordal et al., 2014）. Furthermore, the food preference change upon protein depri- vation has been characterized using a two choice assay in Drosophila （Ribeiro and Dickson, 2010; Vargas et al., 2010）. Different from protein food, sugar is the main energy source, and sugar deficiency severely affects animal survival （Lee et al., 2008）. However, whether animals adopt a strategy of fast food preference switch upon sugar deprivation had not been investigated, and the neural mechanisms underlying this behavior regulation remain poorly understood.
基金We acknowledge the support from National Key R&D Program of China(Grant No.2017YFB0404000)China Postdoctoral Science Foundation(2018M632470)Postdoctoral Science Foundation of Zhejiang Province.
文摘LED has shown great advantages in poultry husbandry.This study focused on the behavioral preferences and production performance of chicken broilers reared under unevenly distributed yellow LED light.Four pens were divided into two groups adopting respective maximum light intensities(MLIs,60 lx and 30 lx).Because of different distances from the installation position of the LED pipe,each pen was distributed with unevenly distributed light.Each pen consisted of four subzones indicated by their light intensities-high intensity(HI),medium intensity(MI),low intensity(LI)and weak intensity(WI).Four subzones were the same size and provided with a feeder and a drinker,respectively.The broilers moved freely across the four subzones.No significant differences in body weight(BW),uniformity of final BW and feed conversion ratio(FCR)were observed between the two experimental groups.However,greater feed intake and water intake were found in HI than those in other subzones.The drinking preference changed with age for four subzones and was more likely to appear at the later stage,despite substantial fluctuations within the replicates.The feeding preference was more constant than the drinking preference and appeared mainly at the early and middle stages of this study.These findings could provide implications for broiler production reared under unevenly distributed LED light condition.
基金supported by the National Natural Science Foundation of China(No.52408012)the Philosophical and Social Science Research Planning Project of Heilongjiang Province(No.23GLA044)+1 种基金the Postdoctoral Funding Project of Heilongjiang Province(No.LBH-Z23189)the Natural Science Foundation of Heilongjiang Province,China(No.LH2024E050)。
文摘The soaring popularity of Ice-and-Snow Tourism(IST)and the growing number of tourists pose challenges for destination managers,particularly in balancing attraction development with the maintenance of high-quality tourism experiences.Understanding tourist behavioral preferences is crucial for the effective utilization of ice-and-snow resources and targeted marketing strategies.However,differences in IST participants'behavioral preferences and influencing factors remain unclear.Taking northeast China as an example,this paper applies text clustering and image recognition techniques to analyze 43,063 pieces of user-generated content(UGC)related to IST.Notable disparities are identified in destination image perception as well as in the temporal and spatial distribution patterns of IST participants,including both tourists and local residents.These findings reveal potential links between the variations and general regional attributes in 41 cities.Overall,tourists tend to develop diverse travel patterns but show similar preferences during specific holiday periods.They tend to concentrate in popular destinations,with stronger perception of distinctive architectural and natural landmarks.In contrast,local residents,with little travel time,exhibit a more dispersed travel pattern,favoring short trips to lesser-known surrounding attractions.In addition,unexpected insights emerge from the coupled analysis of spatiotemporal characteristics related to the destination image.Among 16 regional attributes,most socio-economic factors are positively correlated with tourist distribution,whereas physical geographic factors show relatively weak correlations.Although tourists show a greater preference for well-developed tourism infrastructure,diverse experience offerings,and enhanced safety,they also have a greater appreciation for natural environments than local residents.These findings offer valuable insights for more human-centered IST planning,supporting the optimization of existing attractions to enhance their competitiveness and sustainability.
