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The experiment was to study the effects of different protein levels and amino acid supplementation patterns based on corn-soybean meal diet on the growth performance, shin length, shin circumference, leg muscle, and liver amino acid content of 1~28-day-old goslings. A total of 364 one-day-old male Jiangnan White goslings were randomly divided into four groups, with seven replicates in each group and 13 goslings in each replicate. A two-by-two factorial completely randomized experimental design was used, with two protein levels (18.55% and 15.55%) and two amino acid supplementation patterns (supplementing essential amino acids only and supplementing all amino acids). The four groups were designated as PM (CP 18.55% + essential amino acids, 11.20 MJ/kg), PA (CP 18.55% + all amino acids, 11.20 MJ/kg), LPM (CP 15.55% + essential amino acids, 11.20 MJ/kg), and LPA (CP 15.55% + all amino acids, 11.20 MJ/kg). There were six main amino acids and 12 total amino acids. The experiment lasted for 28 days. The results showed that compared with CP 18.55%, CP 15.55% significantly reduced the average body weight of the goslings on the 7th, 14th and 21st day (P<0.05). Compared with the all amino acid supplementation mode, the essential amino acids supplementation mode of the 14-day goslings and the contents of alanine (Ala), methionine (Met), tyrosine (Tyr), histidine (His) and proline (Pro) in the liver of the goose on the 28th day significantly increased (P<0.05). Compared with CP 18.55%, CP 15.55% significantly reduced the Met content in goslings liver on the 28th day and the threonine (Thr) content in goslings feces on the 27th day to 29th day (P<0.05). The results showed that different protein levels and amino acid supplementation patterns had no adverse effect on the growth performance of goslings on the 28th day, and the adaptability of goslings to low-protein diet was high in the early stage, and reducing the protein level would not have a negative impact on the performance of goslings. [ABSTRACT FROM AUTHOR]

[Objective] The spatial distribution characteristics and coordination relationship between population and economy in Weihe River Basin were explored to provide theoretical basis for reducing regional gap and promoting regional coordinated development. [Methods] Based on population and GDP data of 88 counties and districts in the Weihe River Basin from 2000 to 2019, the imbalance index, geographical concentration, inconsistency index and other methods were comprehensively used to analyze the dynamic evolution characteristics of the relationship between population and economic spatial distribution in the Weihe River Basin from the overall and local levels. Based on the panel data, the influencing factors of population and economic space differentiation were analyzed. [Results] (1) The imbalance between population and economy in the Weihe River Basin had undergone a process of first decreasing and then expanding. The imbalance index had increased from 0.105 in 2000 to 0.107 in 2019, and regional development differences had always existed. (2) The spatial distribution of population and economy was characterized by dense in the southeast and sparse in the northwest, but the population factors mainly concentrated in the counties and districts along the main stream of the Weihe River, and the economic factors mainly concentrated in the municipal districts. (3) According to the inconsistency index, the relationship between population and economic spatial distribution in the Weihe River Basin could be divided into five types: economic polarization, economic advance, balanced development, population advance, and population polarization. (4) The spatial imbalance of population and economic distribution was not only affected by the market mechanism and the role of the government, but also obviously related to the level of urban development and regional development strategy of counties and districts, and the influence of explanatory variables in different periods was also different. [Conclusion] The situation of uncoordinated regional development in the Weihe River Basin is severe. It is still one of the problems to be solved in the future to promote the development of counties in the northwest of this basin, narrow the inter-provincial development gap, and promote the spatial balance of population and economy. [ABSTRACT FROM AUTHOR]

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