[Objectives]In order to better understand the performance of Kongshan cattle,their growth and development was analyzed.[Methods]The body weights of 106 kongshan cattle at different month ages were measured,and the gro...[Objectives]In order to better understand the performance of Kongshan cattle,their growth and development was analyzed.[Methods]The body weights of 106 kongshan cattle at different month ages were measured,and the growth curves and body measurement indices of Kongshan cattle after one year old were analyzed by SPPS18.0.[Results]Kongshan cattle have good body shape.Compared with 1985,the performance of body measurements and weight was improved significantly;and the body measurements and body weight of Kongshan cattle increased significantly after 24 months old,indicating that Kongshan cattle still have good fattening performance in adulthood.[Conclusions]This study analyzed the growth and development laws of Kongshan cattle and the status quo of the population,and will provide some help for the selection and utilization of Kongshan cattle breed more intuitively.展开更多
[Objectives]This study was conducted to analyze and study the growth and development of muscle fibers at different stages,so as to provide a theoretical basis for subsequent research on developmental biology and nutri...[Objectives]This study was conducted to analyze and study the growth and development of muscle fibers at different stages,so as to provide a theoretical basis for subsequent research on developmental biology and nutritional regulation.[Methods]The body weights of black goat lambs in groups at different month age(0-6 months old)were recorded,and the diameter,area and number of muscle fibers were measured by tissue section and hematoxylin-eosin staining.The curves of body weight and muscle fiber growth and development of black goat lambs were drawn.[Results]The black goat lambs maintained a high absolute growth intensity of 2.95-4.35 kg/30 d throughout the rearing cycle,and the body weight continued to increase significantly,while the relative growth coefficient decreased from 93.05%at the age of 30 d to 13.83%at the age of 180 d.The diameter and area of muscle fibers in black goat lambs showed obvious"three-stage"growth and development characteristics,and showed different trends of gender advantages in different stages.[Conclusions]This study will help to further optimize the key supporting technologies for production and promote the diversified and comprehensive development of the mutton sheep industry in Sichuan Province.展开更多
Phytase is a highly efficient hydrolytic enzyme to release phosphorus in plants,and is widely used in animal husbandry production.It has been proved that low dose phytase has beneficial effects and wide application pr...Phytase is a highly efficient hydrolytic enzyme to release phosphorus in plants,and is widely used in animal husbandry production.It has been proved that low dose phytase has beneficial effects and wide application prospects in animal production and environmental protection.Howev-er,literatures show that superdosing phytase has great promotion effects on the growth potential of pigs,while the research and application of super-dosing phytase are still lacking.This paper summarizes action mechanisms of phytic acid and phytase in recent 20 years,application of superdosing phytase in pig production and other problems in the application process.展开更多
基金Supported by Sichuan Beef Cattle Innovation Team Building of National Modern Agricultural industrial Technology System(SCCXTD-2022-13)Sichuan Science and Technology Planning Project(2021YFYZ0001).
文摘[Objectives]In order to better understand the performance of Kongshan cattle,their growth and development was analyzed.[Methods]The body weights of 106 kongshan cattle at different month ages were measured,and the growth curves and body measurement indices of Kongshan cattle after one year old were analyzed by SPPS18.0.[Results]Kongshan cattle have good body shape.Compared with 1985,the performance of body measurements and weight was improved significantly;and the body measurements and body weight of Kongshan cattle increased significantly after 24 months old,indicating that Kongshan cattle still have good fattening performance in adulthood.[Conclusions]This study analyzed the growth and development laws of Kongshan cattle and the status quo of the population,and will provide some help for the selection and utilization of Kongshan cattle breed more intuitively.
基金Supported by Sichuan Mutton Sheep Innovation Team of National Modern Agricultural Industry Technology System(SCCXTD-2021-14)Sichuan Provincial Livestock and Poultry Breeding Key Project(2021YFYZ0003)Modern Animal Husbandry-Breeding of New Herbivore Breeds.
文摘[Objectives]This study was conducted to analyze and study the growth and development of muscle fibers at different stages,so as to provide a theoretical basis for subsequent research on developmental biology and nutritional regulation.[Methods]The body weights of black goat lambs in groups at different month age(0-6 months old)were recorded,and the diameter,area and number of muscle fibers were measured by tissue section and hematoxylin-eosin staining.The curves of body weight and muscle fiber growth and development of black goat lambs were drawn.[Results]The black goat lambs maintained a high absolute growth intensity of 2.95-4.35 kg/30 d throughout the rearing cycle,and the body weight continued to increase significantly,while the relative growth coefficient decreased from 93.05%at the age of 30 d to 13.83%at the age of 180 d.The diameter and area of muscle fibers in black goat lambs showed obvious"three-stage"growth and development characteristics,and showed different trends of gender advantages in different stages.[Conclusions]This study will help to further optimize the key supporting technologies for production and promote the diversified and comprehensive development of the mutton sheep industry in Sichuan Province.
基金Supported by Key Research and Development Project of Science and Technology Department of Sichuan Province (2018NZ0046)
文摘Phytase is a highly efficient hydrolytic enzyme to release phosphorus in plants,and is widely used in animal husbandry production.It has been proved that low dose phytase has beneficial effects and wide application prospects in animal production and environmental protection.Howev-er,literatures show that superdosing phytase has great promotion effects on the growth potential of pigs,while the research and application of super-dosing phytase are still lacking.This paper summarizes action mechanisms of phytic acid and phytase in recent 20 years,application of superdosing phytase in pig production and other problems in the application process.
