Cattle temperament is an interesting trait due to its correlation with production efficiency,labor safety,and animal welfare.To date,however,its genetic basis is not clearly understood.Here,we performed a genome-wide ...Cattle temperament is an interesting trait due to its correlation with production efficiency,labor safety,and animal welfare.To date,however,its genetic basis is not clearly understood.Here,we performed a genome-wide association study for a series of temperament traits in cattle,assessed with via open field and novel object tests,using autosomal single nucleotide polymorphisms(SNPs)derived from the whole-genome sequence.We identified 37 and 29 genome-wide significant loci in the open field and novel object tests,respectively.Gene set analysis revealed the most significant pathway was the neuroactive ligand-receptor interaction pathway,which may be essential for emotional control in cattle.Analysis of the expression levels of 18 tissue-specific genes based on transcriptomic data showed enrichment in the brain,with some candidate genes involved in psychiatric and neurodegenerative diseases in humans.Based on principal component analysis,the first principal component explained the largest variance in the open field and novel object test data,and the most significant loci were assigned to SORCS3 and SESTD1,respectively.Our findings should help facilitate cattle breeding for sound temperament by pyramiding favorable alleles to further improve cattle production.展开更多
In the present study, a micro-scale solar organic Rankine cycle power generation system was developed. The system comprises of a solar collection system based on compound cylindrical Fresnel lens concentrator and an o...In the present study, a micro-scale solar organic Rankine cycle power generation system was developed. The system comprises of a solar collection system based on compound cylindrical Fresnel lens concentrator and an organic Rankine cycle power generation system integrated with a scroll expander. YD320 and R245 fa were used as the heat transfer fluid and the working fluid, respectively. The effects of the evaporation pressure, the degree of superheat, and the mass flow rate of the working fluid were analyzed to evaluate the solar collection efficiency, the electric power output, the thermal efficiency and exergy efficiency of the system. The results illustrate that both the increasing evaporation pressure and decreasing superheat degree have positive impacts on solar collection efficiency. The electric power increases as the evaporation pressure increases, while the thermal efficiency and the exergy efficiency decrease. However, the system overall efficiency decreases slowly due to the increase of solar collection efficiency. The electric power increases with the increment of the working fluid mass flow rate. The increasing mass flow rate has no visible impact on the thermal and exergy efficiencies of organic Rankine cycle subsystem, whereas a slightly increase of the thermal and exergy efficiencies of the integrated system. The electric power decreases with the increase of the superheat degree, whereas the thermal and the exergy efficiencies of the system increase. The system works more suitably with a higher degree of superheat for the small mass flow rate condition.展开更多
基金supported by the National Natural Science Foundation of China(31872317)China Agriculture Research System of MOF and MARA(CARS-37)。
文摘Cattle temperament is an interesting trait due to its correlation with production efficiency,labor safety,and animal welfare.To date,however,its genetic basis is not clearly understood.Here,we performed a genome-wide association study for a series of temperament traits in cattle,assessed with via open field and novel object tests,using autosomal single nucleotide polymorphisms(SNPs)derived from the whole-genome sequence.We identified 37 and 29 genome-wide significant loci in the open field and novel object tests,respectively.Gene set analysis revealed the most significant pathway was the neuroactive ligand-receptor interaction pathway,which may be essential for emotional control in cattle.Analysis of the expression levels of 18 tissue-specific genes based on transcriptomic data showed enrichment in the brain,with some candidate genes involved in psychiatric and neurodegenerative diseases in humans.Based on principal component analysis,the first principal component explained the largest variance in the open field and novel object test data,and the most significant loci were assigned to SORCS3 and SESTD1,respectively.Our findings should help facilitate cattle breeding for sound temperament by pyramiding favorable alleles to further improve cattle production.
基金supported by the Beijing Municipal Natural Science Foundation,China(Grant No.3194057)
文摘In the present study, a micro-scale solar organic Rankine cycle power generation system was developed. The system comprises of a solar collection system based on compound cylindrical Fresnel lens concentrator and an organic Rankine cycle power generation system integrated with a scroll expander. YD320 and R245 fa were used as the heat transfer fluid and the working fluid, respectively. The effects of the evaporation pressure, the degree of superheat, and the mass flow rate of the working fluid were analyzed to evaluate the solar collection efficiency, the electric power output, the thermal efficiency and exergy efficiency of the system. The results illustrate that both the increasing evaporation pressure and decreasing superheat degree have positive impacts on solar collection efficiency. The electric power increases as the evaporation pressure increases, while the thermal efficiency and the exergy efficiency decrease. However, the system overall efficiency decreases slowly due to the increase of solar collection efficiency. The electric power increases with the increment of the working fluid mass flow rate. The increasing mass flow rate has no visible impact on the thermal and exergy efficiencies of organic Rankine cycle subsystem, whereas a slightly increase of the thermal and exergy efficiencies of the integrated system. The electric power decreases with the increase of the superheat degree, whereas the thermal and the exergy efficiencies of the system increase. The system works more suitably with a higher degree of superheat for the small mass flow rate condition.
