羊的性情及其对生产性能的影响研究进展

动物性情是一种能反映家畜情绪变化、侵略性及警觉性等多种表型的复杂特征，包括逃避反应、好斗性、自我修饰和认知反应等，与生产性能、免疫机能及福利状况等密切相关。本文介绍羊的性情、评定方法及遗传水平，分析影响羊性情的因素，以期对羊的性情有较为全面的了解。同时，剖析性情对羊生产性能的影响，为性情选择在养羊生产中应用提供基础资料。     

牛眼虫病的防治

牛眼虫病(又名吸吮线虫病)是由吸吮属的多种线虫寄生于牛的结膜囊、第3眼睑(瞬膜)和泪管内引起的结膜炎、角膜炎,甚至角膜糜烂、溃疡,最后失明的一种地方流行性寄生虫病,普遍存在,夏秋多见,对牛危害较大.     

柑桔盆栽技术

柑桔盆栽技术随着生活水平及观赏意识的提高，许多人欢喜在阳台、屋顶及屋前屋后盆栽柑桔。由于选种及栽培管理不当，未能达到人们的愿望。现将柑桔盆栽技术简介如下。１．品种选择应选择根系浅，细根发达且集中，树冠紧凑短枝多，早熟、叶片浓绿，抗寒、抗旱能力较强的品...     

墨西哥鼠尾草嫁接砧木的筛选试验

一种墨西哥鼠尾草嫁接砧木的筛选试验,包括以下步骤:(1)试验材料选取;(2)嫁接前准备;(3)削砧木、接穗;(4)砧穗对齐并夹住;(5)遮荫保湿管理;(6)数据记录;(7)数据分析与结论。本嫁接方法操作简单,筛选出的砧木与墨西哥鼠尾草嫁接亲和力好且将其砧木与墨西哥鼠尾草嫁接后培育得到的植株,开花量多且花朵丰满相较于未进行嫁接的墨西哥鼠尾草更艳丽、枝干更粗壮、不易倒伏。     

浅议高校图书馆馆藏期刊的深化服务

高校图书馆馆藏期刊由纸本期刊和电子期刊两部分组成,影响其利用率的主要因素有期刊的订购,期刊的揭示,读者的检索能力,图书馆的环境等,针对这些因素探讨了各自的应对策略。     

牛眼虫病的防治

牛眼虫病(又名吸吮线虫病)是由吸吮属的多种线虫寄生于牛的结膜囊、第3眼睑(瞬膜)和泪管内引起的结膜炎、角膜炎,甚至角膜糜烂、溃疡,最后失明的一种地方流行性寄生虫病,普遍存在,夏秋多见,对牛危害较大.在卫生差的环境中,遇上温暖与湿度较高的夏秋季节可引起大批牛只发病.     

机床液压系统油温过高的改善

机床液压传动中油液的温度一般在30℃～50℃的范围内比较合适，最高不超过60℃。如果油温过高，将对液压系统造成不良影响，如易产生泄漏，易使机床产生热变形，影响机床的加工精度及稳定性等。另外，油温过高使一些液压元件产生膨胀后配合间隙减小，增加磨损，严重时会卡死。因此，必须采取合理的方式，来减少系统能量损失，增加散热面积，降低系统的油温。正设计合理的油箱油箱除了贮汕之外，还有一个作用就是散热。一般的实践经验，开式液压系统油箱的有效容积为泵每分钟流量的3～5倍。在系统连续工作时，应按计算发热量来确定。武中：Q…     

Effects of Compound Bacteria Preparation on Fermentation Quality and Rumen Fermentation Characteristics of Phragmites australis Silage北大核心CSCD

The purpose of this study was to investigate the effects of compound bacteria preparation (including homogeneous Lactobacillus/heterogeneous Lactobacillus, Bacillus subtilis and Aspergillus niger as well as their compatibility) on nutrient composition, fermentation quality and rumen fermentation characteristics of Phragmites australis silage. Taking growing Phragmites australis from Dongting lake as silage material, five groups were set up, which were blank group (CK group), lactic acid bacteria group (LA group, supplemented with Lactobacillus plantarum, Pediococcus pentosaceus and Lactobacillus buchneri), lactic acid bacteria+Bacillus subtilis group (LA+BS group), lactic acid bacteria+Aspergillus niger group (LA+AN group) and lactic acid bacteria+Bacillus subtilis+Aspergillus niger group (LA+BS+AN group), and each group had 3 replicates. The supplemental level of lactic acid bacteria was 1.5×108 CFU/kg silage raw materials, and the supplemental levels of Aspergillus niger and Bacillus subtilis were 1.0×108 CFU/kg silage raw materials (all were based on fresh weight of silage raw materials). After 60 days of silage, the nutrient composition and fermentation quality of Phragmites australis silage were determined, and the rumen fermentation characteristics were evaluated by in vitro fermentation and in vivo degradation. The results showed as follows: 1) the contents of dry matter and ash in LA, LA+BS and LA+AN groups were significantly lower than those in CK group (P<0.05), and the crude protein content in LA+BS, LA+AN and LA+BS+AN groups was significantly higher than that in CK and LA groups (P<0.05). 2) The silage sensory evaluation scores of all groups were 60 to 70 points, and the ratings were good. The comprehensive scores of fermentation quality in LA+BS and LA+AN groups were higher, among which, the ammonia nitrogen to total nitrogen ratio, acetic acid content and acetic acid to total acid ratio in LA+AN group were significantly decreased compared with CK group (P<0.05), while the lactic acid content and lactic acid to total acid ratio were significantly increased compared with CK group (P<0.05). 3) The dry matter disappearance rate and total gas production of in vitro fermentation in LA+AN group were significantly higher than those in the other groups (P<0.05), and in vitro fermentation parameters such as volatile fatty acid contents in fermentation liquid were improved. 4) The rumen fermentation dry matter degradation rate in LA+AN and LA+BS+AN groups at 8, 24 and 48 h was significantly higher than that in the other three groups (P<0.05). In conclusion, the combined application of lactic acid bacteria and Aspergillus niger with supplemental levels in this experiment has the best effect on the quality of Phragmites australis silage and rumen fermentation characteristics. © The Author(s) 2023.     

宝源精木板优秀经销商代表——四川新东日装饰建材有限公司

四川新东日装饰建材有限公司（以下简称新东日）自1996年创建以来,致力于生产、经营各种吊顶隔墙材料、天然装饰板材、阻燃板、五金、辅料等各种装饰材料。公司经过近20年的努力,现已成长为一家善于创新的现代化建材专业运营企业和四川省大型装饰建材配送企业。     

浅谈猪流感与猪感冒在兽医临床上的鉴别和治疗

本文主要针对猪流感与猪感冒在兽医临床上的鉴别与治疗相关问题进行分析,只有做好上述疾病的分析工作,方可进一步提高生猪的健康程度,并大大提高生猪的存活率,降低经济损失,间接地为养殖户带来更高的经济收益。