饲料中无机元素分析方法研究进展

饲料中所含的无机元素对动物生长具有重要意义。在饲料中过量添加无机元素会导致环境污染问题,也会通过食物链最终危害消费者的身体健康,因此,对饲料产品中的无机元素进行检测和动态监控尤为重要。综述了近年来饲料中无机元素含量检测主要应用的前处理方法及其含量检测技术,分析了不同前处理方法和含量检测技术的优点和不足,以期为饲料中无机元素分析方法的科学、合理应用提供参考。     

工厂化瓶栽金针菇的配方试验

应用3个营养配方处理,测试其对金针菇的发菌成品率、产品品质和产量的影响。结果,在培养料中加入16%的左右木屑栽培的白金针菇产量高,品质优,可节省成本、提高效益。     

乳制品与补锌

目前我国存在一定程度的锌缺乏现象，可以乳制品为载体，有效的增加锌的吸收量。     

巴氏杀菌牛乳和UHT牛乳的差别

研究了巴氏杀菌、超高温灭菌对牛乳中各种成分的影响，结果发现此两种热处理方式对牛乳中蛋白质、维生素、矿物质和产品风味产生不同影响，而对脂肪的影响不大。     

兽医实验室安全操作规范

正1 入门前的准备1.1 实验室处于封闭状态。实验操作进行中时,要限制非实验人员的进出,如有特殊情况必须经实验室相关负责人同意后,方可进入。1.2 张贴国际通用的生物危险标识。1.3 只有经过培训和许可的人员方能进入实验室。2 岗前培训2.1 实验、研究人员、外来工作人员、学生使用实验室前必须参加生物安全培训。2.2 要接受有关潜在危险知识的培训,掌握预防暴露以及暴露后处理程序。2.3 每年要接受一次最     

Effects of Bacillus amylolyticus on Rumen Dry Matter Digestibility,Fermentation Parameters and Metabolites of Dairy Cows北大核心CSCD

This experiment was conducted to study the effects of Bacillus amylolyticus on rumen dry matter digestibility, fermentation parameters and metabolites of dairy cows. Experiment 1: six dairy cows with permanent fistula and had the similar parity (2 to 3 fetuses), body weight [(662 ±57) kg], lactation days [(160 ± 22) d] and milk yield [(36.1 ±3.8) kg / d], were randomly divided into 3 groups with 2 cows per group. Using 3 ×3 Latin square design, each group was extra fed 0 (control group), 5 ×109 and 5 ×1010 CFU / d Bacillus amylolyticus, the trial period was 3 periods, 13 days for each period, including 10 days for the pre-trial period and 3 days for the trial period. At the beginning of the trial period, the rumen dry matter digestibility of cows was measured by nylon bag method. Experiment 2: thirty dairy cows with similar parity [(2.5 ±0.3) fetuses], initial body weight [(559.2 ± 7. 4) kg], milk yield [(35. 2 ± 1. 5) kg / d] and lactation days [(99 ± 22) d] were randomly divided into three groups with 10 cows in each group. Cows in the 3 groups were extra fed with 0 (control group), 5 ×109 and 5 ×1010 CFU / d Bacillus amylolyticus, respectively. The pre-trial period was 10 days and the trial period was 42 days. The rumen fluid was collected on the last day of the trial period, and the rumen fermentation parameters and metabolites were determined. The results showed as follows: compared with the control group, 1) supplementary feeding of 5 × 1010 CFU / d Bacillus amylolyticus could significantly improve the rumen dry matter digestibility of dairy cows at 12, 24, 36, 48 and 72 h (P <0.05), supplementary feeding of 5 ×109 CFU / d Bacillus amylolyticus could significantly improve the rumen dry matter digestibility of dairy cows at 36 and 48 h (P <0.05); 2) supplementary feeding of 5 ×109 CFU / d Bacillus amylolyticus could significantly increase the contents of isobutyric acid, butyric acid, isovaleric acid, valeric acid, total volatile fatty acid and microbial protein in the rumen of dairy cows (P < 0. 05), supplementary feeding of 5 × 1010 CFU / d Bacillus amylolyticus could significantly increase the contents of isobutyric acid and isovaleric acid in the rumen of dairy cows and significantly reduce the rumen acetic acid / propionic acid (P < 0. 05), supplementary feeding of 5 ×109 and 5 ×1010 Bacillus amylolyticus had no effects on rumen pH and ammonia nitrogen content (P >0.05); 3) eleven metabolic pathways related to differential metabolites were detected, and ascorbic acid and alginate metabolism were significantly enriched (P < 0. 05) . In conclusion, Bacillus amylolyticus can increase the rumen dry matter digestibility, and improve the rumen fermentation function of dairy cows by affecting the content of rumen metabolites. By comprehensive analysis, supplementary feeding of 5 × 109 CFU / d Bacillus amylolyticus can achieve better effect. © 2023 Authors. All rights reserved.     

樱花'初美人樱'品种组培技术研究

[目的]通过植物组织培养技术有效解决樱花品种'初美人樱'种苗繁殖速度慢的难题.[方法]以'初美人樱'樱花品种为试验材料,对其杀菌方法、基本培养基、初代培养、增殖培养、生根培养、驯化与移栽进行初步研究.[结果]通过冷处理苗培育出的嫩芽,成活率最高可达90％.启动培养最适培养基MS+2 mg/L6-BA+0.15 mg/L...     

枸杞种质图像标准化离体采集方法初探

植物图像信息是枸杞种质资源保护利用研究工作的基础.文章介绍了利用摄影技术对枸杞种质图像进行离体拍摄的方法.通过规范图像采集流程,获取具有统一标准的枸杞种质图像,更有利于计算机进行图像识别分析,为枸杞种质资源鉴定评价及数字化储存提供技术支撑.     

宁夏枸杞硬枝扦插育苗技术

宁夏枸杞(Lycium barbarum L.)是茄科枸杞属植物中重要的"药食同源"功能型特产资源.枸杞子既是名贵的中药材,又是保健食品,我国对枸杞的利用已2000多年,宁夏是我国和世界枸杞的原产地和主产区.近年来宁夏枸杞种植在国内发展十分迅速,已发展到新疆、内蒙古、河北、青海、陕西、甘肃等十多个省区.随着全国种植面积的不断扩大,宁夏枸杞种苗的需求量与日俱增,价格不断上涨.为了满足枸杞产业发展的需要,必须进行大量的种苗繁育,硬枝扦插育苗是十分高效而技术简便的育苗方法.     

余杭区慈姑无公害栽培技术

杭州市余杭区是浙江省最大的慈姑生产基地,年种植面积约0.1万hm2,形成了"早稻+慈姑"、"茭白+慈姑"等种植模式,经济效益较好,产品主要销往江苏、上海等地。无公害慈姑栽培技术关键是黑粉病综合防治问题,经过多年实践探索,我们总结出了一套相关技术,具体如下。