影响增殖对虾回捕效果主要因素分析及其对策

本文主要分析了影响增殖对虾回捕效果的几个主要因素,并提出提高对虾放流增殖效果的对策。     

南果梨冷藏试验初报

一、前言南果梨为秋子梨系统,是鞍山地区特产,也是我国北方优良梨品种之一。南果梨果实为圆形,于九月上中旬进入成熟期,果皮薄而光滑,果实呈黄绿色,有红晕。果肉白色,肉质细,石细胞少,采后即可食用,脆而香甜。经过十五至二十天后熟,果实底色变黄,果肉亦变黄,组织柔软细腻,糖     

推广科技新成果 荔枝连年获高产

苍坂农场适龄荔枝31.3亩(470株,其中早红158株、兰竹、乌叶215株、桂林37株,历年来产量低而不稳定,年总产量一直徘徊在3500～4000公斤之间,最低年分只有1250公斤.1982年下半年起在原龙溪地区农垦局的领导安排和福建农学院漳州分部庄王璧讲师的指导下,推广应用“解决适龄荔枝不结果或少结果问题”的科研成果的五项综合措施,即在加强果园管理、恢复树势、提高树质营养水平等农业措施的基础上.采取一促     

平胃散加硝实治猪胎死腹中一例

1985年4月15日,菠萝步村苏某的母猪一头,2岁多,体重约90公斤。该猪第一胎顺产仔猪11头,第二胎配种已156天,下腹稍膨大,既不产仔,也不发情。检查:猪体肥壮,精神尚好,体温正常,食欲稍减,粪便无异;阴户稍肿,排少量粘液;腹部触诊无胎动和疼痛感,只有一些结节状硬实物的感觉。怀疑胎死成木乃伊。治疗:用平胃散加硝实。苍术25克、厚朴25克、陈皮15克、芒硝80克、枳实20克、甘草6克,水煎去渣,候温冲芒硝内服。药后4小时就排出死胎9头,翌晨又排出2头。胎尸无特殊臭味,眼睛凹陷,体重约比第一胎初生重少三分之     

千岛湖园林苗木产业建设与发展对策

通过对浙江千岛湖园林苗木产业建设与发展有利因素及存在的问题的分析，提出了加强产业组织建设、提高科技含量，以及按照市场规律促进千岛湖园林苗木产业发展的措施。     

水力搅拌加速沼气工程启动的研究——(Ⅱ)流场模拟部分

该研究验证了水力搅拌在沼气工程启动阶段的显著优化作用,用3台653.5 L的厌氧发酵实验罐进行接种液启动实验,通过42天连续发酵,采用底部进水高位集中压力出水(单口)和底部进水高位分散式压力出水(四口)两种循环流化水力搅拌方案均取得了显著的优化效果,但四口方案的优化程度明显高于单口方案。利用计算流体动力学(Computational Fluid Dynamics, CFD)数值计算方法,模拟搅拌流场,通过图形识别流场形态缺陷和改进方法,阐述流动规律和产气率、甲烷含量、酸性、COD浓度、氨氮浓度等指标的内在联系,在一定程度上揭示了优化设计水力搅拌方案内在的流体力学机理。     

犬瘟热诊断与治疗病例分析

<正>犬瘟热是由犬瘟热病毒(canine distemper virus,CDV)引起犬科动物的一种急性、高度接触性传染病,临床表现多样化。病犬早期表现双相热型、急性卡他性鼻炎,随后以支气管炎、卡他性肺炎、严重胃肠炎和神经症状为特征。本研究全面跟踪5只疑似犬瘟热病犬的发病情况、临床症状、诊断和治疗过程,以抗病毒、预防继发感染和对症处理为原则,对临床诊治犬瘟热病例具有重要的参考意义。1病犬基本情况2012年10月,玉林市某宠物诊所接诊了5只病犬,基本情况见表1。     

玉林市规模化猪场口蹄疫抗体监测及免疫效果分析

正口蹄疫(foot and mouth disease,FMD),又称口疮热,是由口蹄疫病毒(FMDV)引起的主要侵染偶蹄动物的一种急性、热性和高度接触性传染病[1],该病传播途径多、速度快,曾多次在世界范围内暴发流行,给养殖业造成巨大经济损失。鉴于此,世界动物卫生组织(OIE)将其列为A类传染病之首。目前,有2/3的OIE成员国流行FMD[2]。玉林是广西的养猪大市,2016年生猪饲养量为1 658.36万头,占广西饲养总量的22.95%。由于生猪养殖量大,健康状况各异,规模化猪场的猪     

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.