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影响颗粒饲料耐久性指数的因素及其控制 总被引：1，自引：1，他引：0
<正>颗粒饲料耐久性指数(PDI,Pellet durability index)是反映颗粒饲料质量最主要的指标之一,它是用来衡量颗粒饲料成品在输送和搬运过程中饲料颗粒抗破碎的相对能力。其含义是把冷却、筛分后的颗粒饲料样品放在一个特制的回转箱中翻转一定时间,模拟饲料的输送和搬运过程,在样品翻转后通过筛分,最后 相似文献
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老窝火腿是怒江州的地方特产之一,由于其含盐量适中,腌制方法独特,具有较强的地方风味,受到消费者的好评.近年来,泸水畜牧业快速发展,县内各种畜产品频繁流人到省内各地,另外到泸水旅游人数不断增加,老窝火腿的知名度不断提高,促进了该产品的生产发展. 相似文献
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人们办事情讲究天时地利人和三个条件.养蜂人也讲究三个条件,即:蜜源、蜂群、气候,三者缺一不可.有好的蜜源,蜂群不强壮,有蜜也采不回来,蜂群很强壮,没有蜜源,形成劳力过剩也采不到蜜;蜜源好蜂群壮,椴树生长发育期不是干旱、低温就是虫灾冻害,或者椴树开花期连日阴雨蜜蜂不能出勤采蜜,甚至下起大暴雨而流蜜不收. 相似文献
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木瓜新品种"红霞一号"是由山东省临沂市兰山区南坊镇前小寺村"木瓜大王"倪明前同志经多年嫁接选育而成的木瓜新品种,该品种属蔷薇科、落叶灌木,主杆高2.5 m,冠幅直径1.5 m,枝刺少,叶长椭圆形,先端尖锐,边缘锯齿细密,深绿或淡绿色.秋季花芽分化,严冬吐蕾成红色.清明开花,花色深红,粉红、淡黄、红白镶嵌.结果圆柱形,果色黄绿、带红晕、深红似霞.8-9月成熟,单果平均重250～500g. 相似文献
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韩丹 《畜牧兽医科技信息》2008,(4):91
曲霉菌病是多种禽类、哺乳动物和常人的真菌病.主要侵害呼吸器官,幼年最易感染并且常呈急性暴发,造成大批死亡.2006年11月,开原市一农户饲养的雏鸭,暴发了以呼吸困难,死亡率高为特征的疾病,经综合诊断为雏鸭曲霉菌病.现将诊疗情况报告如下. 相似文献
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1兔瘟兔瘟是獭兔的头号"杀手",近年来该病明显出现了早龄化、非典型性和散发型特点。发病年龄是多元化趋势,尤其是刚断乳的仔兔也有发生,最早在40日龄左右。临床症状和解剖特点也并非与典型性的兔瘟完全相符,其主要特征是精神 相似文献
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(一)发病情况 2007年6月2日,江苏省滨海县正红镇某养殖户饲养的300多只29日龄草鸡出现精神不振,减食或停食,羽毛松乱,腹泻等症状.于是该养殖户带病鸡来向笔者求诊.主诉:因初次养鸡,只给鸡群在18日龄时用法氏囊苗饮水,且鸡群一直用乳猪料饲喂,求诊时已死亡20多只. 相似文献
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对虾白斑综合征病毒（White spot syndrome virus,WSSV）是引起对虾白斑综合征（White spot syndrome,WSS）的病原。该病一旦流行,对虾在2～7天内的死亡率可达100％,国际兽疫局（OIE）、联合国粮农组织（FAO）以及亚太地区水产养殖发展网络中心（NACA）早在1995年就将其列为需要报告的重要的水生动物病毒性疫病之一。上世纪90年代初,该病首先在台湾地区发生,到1994年已扩展到全亚洲的对虾养殖地区。1995年11月该病毒在西半球被发现,1999年到达美国中部和南部,2001年出现在欧洲和澳洲。短短10年间,对虾白斑综合征席卷全球,给世界对虾养殖业造成了不可估量的损失。 相似文献
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奶牛病毒性腹泻病的血清学调查 总被引：7，自引：1，他引：6
牛病毒性腹泻病毒(Bovine Virus Diarrhoea Virus,BVDV)是一种黄病毒科瘟病毒属成员,可感染牛引起一系列消化道病.临床症状包括发热、腹泻、产奶量下降;在感染的动物群中,具有高发病率、低死亡率特点.怀孕母牛的感染可经胎盘感染给胎儿.胎儿可能会流产、木乃伊、死胎.然而,在很多情况下,如果出现免疫耐受,可以保持持久的病毒血症,成为病毒的传染源.本病在自然情况下可以传染黄牛、水牛、牦牛、绵羊、山羊、猪等,各种年龄的牛均可感染,但以3～18月龄的幼年牛常易表现症状,其他年龄的牛多呈隐性感染. 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献