China has the world’s largest sheep flock and the largest producer of sheep meat by far. However, the nutrient requirements have not been systemically studied and there is a lack of knowledge of nutrient requirement ...China has the world’s largest sheep flock and the largest producer of sheep meat by far. However, the nutrient requirements have not been systemically studied and there is a lack of knowledge of nutrient requirement for meat-type sheep in China.Since 2008, the nutrient requirements of meat-type sheep in China has been systematically investigated. In this review, we introduced the history of studies of nutrient requirements of meat-type sheep in China, summarized the recent advances in nutrient requirements of meat-type sheep, and highlighted the future directions of researches on nutrient requirements of meat-type sheep in China.展开更多
Background:Egg production is economically important in the meat-type chicken industry.To better understand the molecular genetic mechanism of egg production in meat-type chicken,genetic parameter estimation,genome-wid...Background:Egg production is economically important in the meat-type chicken industry.To better understand the molecular genetic mechanism of egg production in meat-type chicken,genetic parameter estimation,genome-wide association analyses combined with meta-analyses,Bayesian analyses,and selective sweep analyses were performed to screen single nucleotide polymorphisms(SNPs)and other genetic loci that were significantly associated with egg number traits in 11,279 chickens from seven material lines.Results:Yellow-feathered meat-type chickens laid 115 eggs at 43 weeks of age and white-feathered chickens laid 143 eggs at 60 weeks of age,with heritability ranging from 0.034–0.258.Based on meta-analyses and selective sweep analyses,one region(10.81–13.05 Mb)on chromosome Z was associated with egg number in all lines.Further analyses using the W2 line was also associated with the same region,and 29 SNPs were identified that significantly affected estimation of breeding value of egg numbers.The 29 SNPs were identified as having a significant effect on the egg number EBV in 3194 birds in line W2.There are 36 genes in the region,with glial cell derived neurotrophic factor,DAB adaptor protein 2,protein kinase AMP-activated catalytic subunit alpha 1,NAD kinase 2,mitochondrial,WD repeat domain 70,leukemia inhibitory factor receptor alpha,complement C6,and complement C7 identified as being potentially affecting to egg number.In addition,three SNPs(rs318154184,rs13769886,and rs313325646)associated with egg number were located on or near the prolactin receptor gene.Conclusion:Our study used genomic information from different chicken lines and populations to identify a genomic region(spanning 2.24 Mb)associated with egg number.Nine genes and 29 SNPs were identified as the most likely candidate genes and variations for egg production.These results contribute to the identification of candidate genes and variants for egg traits in poultry.展开更多
【目的】探讨不同添加剂量的黄芪多糖脂质体对肉鸡生长性能及免疫器官指数的影响,为黄芪多糖的临床推广提供参考。【方法】在肉鸡日粮中添加不同剂量的黄芪多糖脂质体,于试验第14、28及42天计算其平均日增重、饲料转化率、特定生长率、...【目的】探讨不同添加剂量的黄芪多糖脂质体对肉鸡生长性能及免疫器官指数的影响,为黄芪多糖的临床推广提供参考。【方法】在肉鸡日粮中添加不同剂量的黄芪多糖脂质体,于试验第14、28及42天计算其平均日增重、饲料转化率、特定生长率、胸腺指数、脾脏指数和法氏囊指数。【结果】黄芪多糖脂质体能够显著提高肉鸡平均日增重、饲料转化率、特定生长率、胸腺指数、脾脏指数和法氏囊指数。【结论】提高肉鸡生长性能的最佳黄芪多糖脂质体添加剂量为100 m L/kg,连续添加14 d效果最佳。提高肉鸡免疫器官指数的最佳黄芪多糖脂质体添加剂量为50 m L/kg,连续添加28~42 d效果最佳。展开更多
基金supported by the China Agriculture Research System of MOF and MARA(CARS-38)the Project of Exploitation and Utilization of High Quality Green and Rough Feed Resources,China(16200157)the Inner Mongolia Science and Technology Agency,China(2020GG0058)。
文摘China has the world’s largest sheep flock and the largest producer of sheep meat by far. However, the nutrient requirements have not been systemically studied and there is a lack of knowledge of nutrient requirement for meat-type sheep in China.Since 2008, the nutrient requirements of meat-type sheep in China has been systematically investigated. In this review, we introduced the history of studies of nutrient requirements of meat-type sheep in China, summarized the recent advances in nutrient requirements of meat-type sheep, and highlighted the future directions of researches on nutrient requirements of meat-type sheep in China.
基金the Guangdong Provincial Key Research and Development Program(2020B02022002)the Shandong Agricultural Seed Improvement Project(2020LZGC013)the Technological Innovation Project of Chinese Academy of Agricultural Sciences(CAAS-ZDRW202005)。
文摘Background:Egg production is economically important in the meat-type chicken industry.To better understand the molecular genetic mechanism of egg production in meat-type chicken,genetic parameter estimation,genome-wide association analyses combined with meta-analyses,Bayesian analyses,and selective sweep analyses were performed to screen single nucleotide polymorphisms(SNPs)and other genetic loci that were significantly associated with egg number traits in 11,279 chickens from seven material lines.Results:Yellow-feathered meat-type chickens laid 115 eggs at 43 weeks of age and white-feathered chickens laid 143 eggs at 60 weeks of age,with heritability ranging from 0.034–0.258.Based on meta-analyses and selective sweep analyses,one region(10.81–13.05 Mb)on chromosome Z was associated with egg number in all lines.Further analyses using the W2 line was also associated with the same region,and 29 SNPs were identified that significantly affected estimation of breeding value of egg numbers.The 29 SNPs were identified as having a significant effect on the egg number EBV in 3194 birds in line W2.There are 36 genes in the region,with glial cell derived neurotrophic factor,DAB adaptor protein 2,protein kinase AMP-activated catalytic subunit alpha 1,NAD kinase 2,mitochondrial,WD repeat domain 70,leukemia inhibitory factor receptor alpha,complement C6,and complement C7 identified as being potentially affecting to egg number.In addition,three SNPs(rs318154184,rs13769886,and rs313325646)associated with egg number were located on or near the prolactin receptor gene.Conclusion:Our study used genomic information from different chicken lines and populations to identify a genomic region(spanning 2.24 Mb)associated with egg number.Nine genes and 29 SNPs were identified as the most likely candidate genes and variations for egg production.These results contribute to the identification of candidate genes and variants for egg traits in poultry.
文摘【目的】探讨不同添加剂量的黄芪多糖脂质体对肉鸡生长性能及免疫器官指数的影响,为黄芪多糖的临床推广提供参考。【方法】在肉鸡日粮中添加不同剂量的黄芪多糖脂质体,于试验第14、28及42天计算其平均日增重、饲料转化率、特定生长率、胸腺指数、脾脏指数和法氏囊指数。【结果】黄芪多糖脂质体能够显著提高肉鸡平均日增重、饲料转化率、特定生长率、胸腺指数、脾脏指数和法氏囊指数。【结论】提高肉鸡生长性能的最佳黄芪多糖脂质体添加剂量为100 m L/kg,连续添加14 d效果最佳。提高肉鸡免疫器官指数的最佳黄芪多糖脂质体添加剂量为50 m L/kg,连续添加28~42 d效果最佳。
