Plant extracts with antioxidant activities have effect on male mule ducks performance, and livestock animals have a strong metabolism activity, due to their high production requirements. It can lead to oxidative stres...Plant extracts with antioxidant activities have effect on male mule ducks performance, and livestock animals have a strong metabolism activity, due to their high production requirements. It can lead to oxidative stress disorders; deteriorate growth performance and even their health. The objective of this study was to assess the effect of a mixture of active ingredients of plant extracts, known for their antioxidant and anti-inflammatory properties, on performances of mule ducks, in rearing and force-feeding period. Then 3,200 day-old mule ducks （MMGxPKL） were separated in 2 groups （negative control and treatment = EL） ×4 replicates per group for the rearing period. Each group received the same feeding program. EL group was supplemented, until the force-feeding period, with a mixture of actives from plants incorporated at 0.5% in the complete feed. At 84 days, the live weight and the feed consumption were measured for each treatment. Blood samples were also taken to measure the activity of two antioxidant enzymes： SOD （superoxide dismutase） and GPx （glutathione peroxidase）. For force-feeding, the ducks were separated among 3 farmers during 12 days. At slaughter, individual measures of breast and liver were conducted. At 84 days, mean live weight for EL group was improved by 3.7% （p 〈 0.001）. Feed conversion ratio was also improved （4.50 versus 4.62）. At slaughter, breast weight was higher for EL group （p 〈 0.01）. A high variability in the results of the activities of antioxidant enzymes was obtained. A decrease in SOD activity in erythrocytes was observed for the EL group （p 〈 0.05）. The results showed that the actives assessed in this study, distributed to ducks during the rearing period, had a beneficial effect on growth performance over that period. The mechanisms of endogenous antioxidant system and inflammatory responses remain to be elucidated.展开更多
Delimitation of an urban growth boundary(UGB)can effectively curb disorderly urban expansion,optimize urban development space and protect the ecological environment.Eco-environmental sensitivity was evaluated and area...Delimitation of an urban growth boundary(UGB)can effectively curb disorderly urban expansion,optimize urban development space and protect the ecological environment.Eco-environmental sensitivity was evaluated and areas prohibiting construction expansion were extracted by establishing an index system.Point of interest(POI)and microblog data were utilized to analyze the expansion of residential activity space.Urban space expansion potential was calculated using a comprehensive evaluation model,and an urban growth boundary for Jinan in 2020 was delimited combining the predicted urban expansion scale.The results showed that:(1)An evaluation of eco-environmental sensitivity can effectively protect ecological land and provide an ecological basis for urban expansion.Regions with high eco-environmental sensitivities in Jinan are located along the banks of the Yellow River and Xiaoqing River and in southeast mountainous areas,but eco-environmental sensitivities in the central,north and southeast areas are relatively low;(2)The model to evaluate urban residential activity expansion can quantify the spatial distribution of urban residents’activities.Regions with high potential for residential activity space expansion in Jinan are mainly concentrated in the middle of Jinan and most are part of existing built-up areas and surrounding areas;(3)The method that delimits urban growth boundaries based on the coordination of ecology and residential activity space is reasonable.Spatial expansion in Jinan mainly extends towards the east and west wings,and the boundary conforms to the spatial strategy guiding Jinan’s development and is consistent with the overall layout in related plans.Considering both ecological protection and the internal forces driving urban expansion,the method of urban growth boundary delimitation used in this study can provide a reference and practical help for studies and management of urban development in the new era.展开更多
文摘Plant extracts with antioxidant activities have effect on male mule ducks performance, and livestock animals have a strong metabolism activity, due to their high production requirements. It can lead to oxidative stress disorders; deteriorate growth performance and even their health. The objective of this study was to assess the effect of a mixture of active ingredients of plant extracts, known for their antioxidant and anti-inflammatory properties, on performances of mule ducks, in rearing and force-feeding period. Then 3,200 day-old mule ducks （MMGxPKL） were separated in 2 groups （negative control and treatment = EL） ×4 replicates per group for the rearing period. Each group received the same feeding program. EL group was supplemented, until the force-feeding period, with a mixture of actives from plants incorporated at 0.5% in the complete feed. At 84 days, the live weight and the feed consumption were measured for each treatment. Blood samples were also taken to measure the activity of two antioxidant enzymes： SOD （superoxide dismutase） and GPx （glutathione peroxidase）. For force-feeding, the ducks were separated among 3 farmers during 12 days. At slaughter, individual measures of breast and liver were conducted. At 84 days, mean live weight for EL group was improved by 3.7% （p 〈 0.001）. Feed conversion ratio was also improved （4.50 versus 4.62）. At slaughter, breast weight was higher for EL group （p 〈 0.01）. A high variability in the results of the activities of antioxidant enzymes was obtained. A decrease in SOD activity in erythrocytes was observed for the EL group （p 〈 0.05）. The results showed that the actives assessed in this study, distributed to ducks during the rearing period, had a beneficial effect on growth performance over that period. The mechanisms of endogenous antioxidant system and inflammatory responses remain to be elucidated.
基金National Natural Science Foundation of China(41430861)
文摘Delimitation of an urban growth boundary(UGB)can effectively curb disorderly urban expansion,optimize urban development space and protect the ecological environment.Eco-environmental sensitivity was evaluated and areas prohibiting construction expansion were extracted by establishing an index system.Point of interest(POI)and microblog data were utilized to analyze the expansion of residential activity space.Urban space expansion potential was calculated using a comprehensive evaluation model,and an urban growth boundary for Jinan in 2020 was delimited combining the predicted urban expansion scale.The results showed that:(1)An evaluation of eco-environmental sensitivity can effectively protect ecological land and provide an ecological basis for urban expansion.Regions with high eco-environmental sensitivities in Jinan are located along the banks of the Yellow River and Xiaoqing River and in southeast mountainous areas,but eco-environmental sensitivities in the central,north and southeast areas are relatively low;(2)The model to evaluate urban residential activity expansion can quantify the spatial distribution of urban residents’activities.Regions with high potential for residential activity space expansion in Jinan are mainly concentrated in the middle of Jinan and most are part of existing built-up areas and surrounding areas;(3)The method that delimits urban growth boundaries based on the coordination of ecology and residential activity space is reasonable.Spatial expansion in Jinan mainly extends towards the east and west wings,and the boundary conforms to the spatial strategy guiding Jinan’s development and is consistent with the overall layout in related plans.Considering both ecological protection and the internal forces driving urban expansion,the method of urban growth boundary delimitation used in this study can provide a reference and practical help for studies and management of urban development in the new era.
