共查询到20条相似文献,搜索用时 93 毫秒
1.
【目的】研究两种通风模式下杭州地区规模化猪场舍内环境参数及其分布规律,筛选出适合本地区推广的通风模式。【方法】选取杭州地区具有代表性的横向通风和纵向通风两种通风模式下育肥舍为研究对象,开展了早、中、晚3个不同时间点,进风口、舍中央和排风口3个不同位置的热环境参数、有害气体浓度的监测,持续监测1周。分析不同时间点和舍内不同位置对热环境参数(温度、相对湿度、风速)以及有害气体(氨气(NH3)和硫化氢(H2S))浓度的影响,并对两种模式下的热环境参数及有害气体浓度进行比较分析;采用空气沉淀法收集舍内环境中的细菌,并对细菌进行培养及统计分析,比较两种模式下育肥舍中细菌数量差异。【结果】两种通风模式下育肥舍相对湿度均低于国家标准,位置和各时间点对相对湿度影响不大,其中纵向通风舍内的相对湿度显著高于横向通风模式(P<0.05)。两种通风模式舍内平均温度没有显著性差异(P>0.05),舍内中午温度显著高于早、晚(P<0.05),位置对纵向通风舍内温度影响较大。纵向通风舍内平均风速为(1.09±0.42)m/s,符合国家标准且极显著高于横向... 相似文献
2.
1通风不论鸡舍大小或养鸡数量多少,保持舍内空气新鲜、通风良好是必不可少的。通风不好,随时会有大量的有害气体,如氨气、二氧化碳和硫化氢等释放出来,并充溢于整个鸡舍,影响鸡的正常生长、产蛋,并引发多种疾病。因此,生产中应在鸡舍设置地窗、 相似文献
3.
4.
5.
随着集约化和规模化畜牧业的发展,环境应激对畜牧生产和健康产生了巨大的影响,我国夏季大部分地区高温又使畜牧业生产蒙受了巨大的损失。本文结合我国畜牧生产实际,论述了应激和热环境对畜禽健康的影响,旨在引起人们对畜禽生态环境改善的关注。 相似文献
6.
低聚果糖作为益生元的代表性物质,因为特殊的理化性质,添加于饲料中具有防水防霉等优势。低聚果糖可选择性被肠道双歧杆菌、乳酸菌等有益菌利用促进其增殖,而对大肠杆菌等有害菌具有抑制作用。低聚果糖除能通过促进生长、降低腹泻和死亡率等来改善畜禽生产性能,还能通过调控肠道菌群、肠道发酵、维持肠黏膜形态和提高机体免疫等来促进畜禽肠道健康。本文对低聚果糖在畜禽肠道健康方面的研究进展进行综述,旨在为其在饲料中的开发利用提供应用和理论依据。[关键词] 低聚果糖|畜禽|肠道健康 相似文献
8.
9.
朱业霞 《河南畜牧兽医(综合版)》2020,(1):41-42
1畜禽养殖污染对生态环境的影响1.1对大气的污染绝大部分的养殖户为了方便管理养殖场,直接就近选址,将畜禽养殖场建在居民较多的地方,殊不知,养殖场周围含有许多刺激性气体,这对周围的大气环境造成了极大的危害。另外,畜禽产生的粪便含有有害气体,其中包括形成酸雨的主要物质,致使周围的居民以及动植物受到威胁,破坏整个生态环境的平衡。 相似文献
10.
11.
Performance of Community-based Animal Health Workers in the Delivery of Livestock Health Services 总被引:1,自引:1,他引:0
Since the liberalization of animal health services in Kenya in the early 1990s, community-based animal health workers (CBAHWs) have become an important alternative animal health delivery channel in the country's marginal areas. However, professional veterinary practitioners have questioned the effectiveness of CBAHW programmes in animal health service delivery in Kenya. This is partly due to lack of information about their performance and partly because CBAHW programmes were implemented before the necessary changes in the existing legal, policy and institutional frameworks had been made. This study was designed to provide such information. In this regard, the productivity of livestock herds among farmers who utilized the services of CBAHWs was compared to that of livestock belonging to farmers who utilized the services of professional veterinarians. The annual live births per mature female (birth ratio) and the proportion of young stock to mature females (breeding index) was computed over a period of 3 years in cattle and goat herds under care of CBAHWs and professional veterinarians. The birth ratios in cattle and goats under CBAHWs were not significantly different from those under the care of professional veterinarians (p > 0.05). Furthermore, the breeding index of cattle and goats under the two categories was not statistically different. Besides the CBAHWs providing clinical services, they also created positive externalities through participatory learning enjoyed by neighbouring livestock keepers, who later dispensed with their services. Policy attention is therefore needed to enhance the participation of CBAHWs in animal health service delivery and to appropriately integrate their activities into the existing formal animal health delivery system in Kenya. Interventions that improve the professional development of these workers, with emphasis on areas pertaining to care of young stock, would not only promote the sustainability of CBAHW programmes but would also improve livestock productivity in the country's marginal areas. 相似文献
12.
13.
14.
15.
16.
17.
18.
骨骼构成机体结构的基本框架,骨形成和骨吸收的动态平衡关系到骨骼健康。钙和磷是动物体骨骼生长发育过程中重要的矿物质元素,机体对其吸收与调控直接影响骨代谢过程。血钙和血磷水平的变化,改变了机体相关调节激素的分泌,而这些激素可影响骨骼发育,因此,钙、磷代谢与骨骼健康紧密相关。综合国内外钙、磷代谢和骨代谢等方面的研究,从钙、磷的吸收和代谢,含量和比例以及钙磷代谢相关调节激素对骨骼发育的调控机制等方面进行综述,旨在为后续动物钙、磷代谢和骨骼之间调控的研究提供参考。 相似文献
19.