试验旨在研究过瘤胃葡萄糖(RPG)对西门塔尔肉牛育肥期生长性能及血清生化指标的影响。选取15~18月龄、初始体重(444.3±26.9)kg的健康纯种西门塔尔公牛30头,采用单因素随机区组试验设计分为3组,每组10头。对照组基础日粮中不添加RPG...试验旨在研究过瘤胃葡萄糖(RPG)对西门塔尔肉牛育肥期生长性能及血清生化指标的影响。选取15~18月龄、初始体重(444.3±26.9)kg的健康纯种西门塔尔公牛30头,采用单因素随机区组试验设计分为3组,每组10头。对照组基础日粮中不添加RPG,试验组在基础日粮中分别添加100 g和300 g RPG。为了避免额外添加RPG对育肥效果产生影响,对照组和100g RPG组分别添加未受保护的葡萄糖,使3组添加的葡萄糖总量保持一致。试验预试期为7 d,正试期为90 d。结果表明:0~40 d,100 g RPG组饲料转化效率高于对照组(P<0.05);40~90 d,300 g RPG组平均日增重和饲料转化效率均高于对照组(P<0.01);0~90 d,300 g RPG组平均日增重高于对照组(P<0.05),饲料转化效率随着RPG添加量增加而提高(P<0.01);300 g RPG组肉牛0~90 d的体高和胸围增量均高于对照组(P<0.05);300 g RPG组肉牛血清中葡萄糖和白蛋白含量高于对照组(P<0.05);试验组球蛋白含量低于对照组(P<0.05),血液中白蛋白/球蛋白的数值随着RPG添加量增加而提高(P<0.05);对照组非酯化脂肪酸含量高于300 g RPG组和100 g RPG组(P<0.05)。可见,在不影响育肥肉牛机体健康的情况下,添加RPG可以提高试验期育肥肉牛的平均日增重,且以添加300 g RPG对肉牛育肥效果较好。展开更多
Eupatorium adenophorum Spreng. was introduced in Yunnan Province of China around 1940. Since then it has been spreading rapidly, particularly in the southern and southwestern parts of China and caused serious economic...Eupatorium adenophorum Spreng. was introduced in Yunnan Province of China around 1940. Since then it has been spreading rapidly, particularly in the southern and southwestern parts of China and caused serious economic loss. The biological research and inte-grated control on E. adenophorum were carried out from 1980's in Yunnan Province. Together with other 15 invasive external species, the weed has been listed in the White Paper by The State Environmental Protection Administration of China. This paper briefly reviews the studies on natural distribution, biological character, ecological character, chemical component, hazard, potential application and the control of E. adenophorum. The research direction for this invasive external species in future was also discussed.展开更多
Eupatorium adenophorum is one of main invasive plants in China and has caused great economic losses. A study was conducted to determine the biomass allocation, leaf morphology and growth response of E. adenophorum see...Eupatorium adenophorum is one of main invasive plants in China and has caused great economic losses. A study was conducted to determine the biomass allocation, leaf morphology and growth response of E. adenophorum seedlings that grew under five different intensities （relative irradiances RI 10%, 20 %, 30%, 55%, 100%） for 14 months. Results reveal that the species shows typical leaf morphological adaptation to different light conditions. The total biomass of seedlings increased with the increase of light intensity from 10% to 55% RI but decreased at RI 100% （full sunlight）. Height growth increased with the increase of light intensity from 10% to 30% RI but decreased when light intensity was over 30% RI. At low light levels, plants enhanced light availability by means of increasing biomass allocation to leaves and formation of larger, thinner leaves with high specific leaf area （SLA）, leading to a high leaf area ratio （LAR） and high stem strips length （SSL）. The mean relative growth rate （RGR） of the plant increased with the light intensity increase and attained the maximum at 55% RI. The growth of seedlings at 30%-55% RI was much better than that at full light condition. This might be an adaptive strategy that supports the vigorous invasiveness of this species, because a high-shaded canopy could prevent other plant species from surviving and growing. This study indicates that E. adenophorum could adapt to different light conditions, especially to low light habit. This can explain its greater invasiveness.展开更多
文摘试验旨在研究过瘤胃葡萄糖(RPG)对西门塔尔肉牛育肥期生长性能及血清生化指标的影响。选取15~18月龄、初始体重(444.3±26.9)kg的健康纯种西门塔尔公牛30头,采用单因素随机区组试验设计分为3组,每组10头。对照组基础日粮中不添加RPG,试验组在基础日粮中分别添加100 g和300 g RPG。为了避免额外添加RPG对育肥效果产生影响,对照组和100g RPG组分别添加未受保护的葡萄糖,使3组添加的葡萄糖总量保持一致。试验预试期为7 d,正试期为90 d。结果表明:0~40 d,100 g RPG组饲料转化效率高于对照组(P<0.05);40~90 d,300 g RPG组平均日增重和饲料转化效率均高于对照组(P<0.01);0~90 d,300 g RPG组平均日增重高于对照组(P<0.05),饲料转化效率随着RPG添加量增加而提高(P<0.01);300 g RPG组肉牛0~90 d的体高和胸围增量均高于对照组(P<0.05);300 g RPG组肉牛血清中葡萄糖和白蛋白含量高于对照组(P<0.05);试验组球蛋白含量低于对照组(P<0.05),血液中白蛋白/球蛋白的数值随着RPG添加量增加而提高(P<0.05);对照组非酯化脂肪酸含量高于300 g RPG组和100 g RPG组(P<0.05)。可见,在不影响育肥肉牛机体健康的情况下,添加RPG可以提高试验期育肥肉牛的平均日增重,且以添加300 g RPG对肉牛育肥效果较好。
基金This study was supported by Project of Chinese Academy of Science Knowledge Innovation Program (KSCX1-SW-13-0X-0X) and National Natural Science Foundation of China (30470337)
文摘Eupatorium adenophorum Spreng. was introduced in Yunnan Province of China around 1940. Since then it has been spreading rapidly, particularly in the southern and southwestern parts of China and caused serious economic loss. The biological research and inte-grated control on E. adenophorum were carried out from 1980's in Yunnan Province. Together with other 15 invasive external species, the weed has been listed in the White Paper by The State Environmental Protection Administration of China. This paper briefly reviews the studies on natural distribution, biological character, ecological character, chemical component, hazard, potential application and the control of E. adenophorum. The research direction for this invasive external species in future was also discussed.
基金This study is supported by Doctor Fund Project of Educa-tion Department (20050290003), Knowledge Innovation Project of Chinese Academy of Sciences (KSCX1-SW-13-0X-0X) and the National Natural Science Foundation of China (30470337)
文摘Eupatorium adenophorum is one of main invasive plants in China and has caused great economic losses. A study was conducted to determine the biomass allocation, leaf morphology and growth response of E. adenophorum seedlings that grew under five different intensities （relative irradiances RI 10%, 20 %, 30%, 55%, 100%） for 14 months. Results reveal that the species shows typical leaf morphological adaptation to different light conditions. The total biomass of seedlings increased with the increase of light intensity from 10% to 55% RI but decreased at RI 100% （full sunlight）. Height growth increased with the increase of light intensity from 10% to 30% RI but decreased when light intensity was over 30% RI. At low light levels, plants enhanced light availability by means of increasing biomass allocation to leaves and formation of larger, thinner leaves with high specific leaf area （SLA）, leading to a high leaf area ratio （LAR） and high stem strips length （SSL）. The mean relative growth rate （RGR） of the plant increased with the light intensity increase and attained the maximum at 55% RI. The growth of seedlings at 30%-55% RI was much better than that at full light condition. This might be an adaptive strategy that supports the vigorous invasiveness of this species, because a high-shaded canopy could prevent other plant species from surviving and growing. This study indicates that E. adenophorum could adapt to different light conditions, especially to low light habit. This can explain its greater invasiveness.
