阿司匹林可减少仔猪腹泻     

刘明江 《上海畜牧兽医通讯》1992,(3)

在3～4周龄断奶仔猪的日粮中添加125ppm的阿司匹林,可提高仔猪的采食量和平均日增重,并可减少仔猪的腹泻.美国弗吉尼亚工学院的研究人员报道:阿司匹林对血红蛋白浓度或血凝时间没有影响。但是,血细胞比容数值和结肠内消化物的干物质含量略微高一  相似文献   

母猪妊娠及泌乳期间日粮钙含量对母乳成分和仔猪生长的影响     

刘明江 《上海饲料》1997,5(3):16-18,21

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饲用微生物在饲料加工中的承受能力   总被引：2，自引：0，他引：2  

刘明江 《饲料工业》1993,14(12):4-5

<正> 一些消费者组织正在向政府立法机关施加压力,要求限制在饲料中使用亚治疗浓度的抗菌素。有些饲料厂和畜牧场认为,直接饲喂的微生物(特别是细菌和酵母)能够替代畜禽饲料中的抗菌素。直接饲喂的微生物(简称DFMs)和抗菌素都能改善家畜生产性能,但前者是活的微生物,因此两者处理方法不同。依据饲料厂的情况,DFMs可能需要冷藏,贮存于凉爽干燥处,或在贮存时避免阳光直射,以延长DFMs的保存期。同时饲料加工方法对DFMs有一定影响,应该加以研究。在最近的10年中,在细菌和酵母稳定和  相似文献   

Progressive adaptation: evolution and escalation     

Kohn AJ 《Science (New York, N.Y.)》1987,237(4819):1235-1236

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Selenium response in dairy cattle     

Tasker JB  Bewick TD  Clark RG  Fraser AJ 《New Zealand veterinary journal》1987,35(8):139-140

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Parapoxvirus infections in New Zealand farmed red deer (Cervus elaphus)     

Horner GW  Robinson AJ  Hunter R  Cox BT  Smith R 《New Zealand veterinary journal》1987,35(4):41-45

Outbreaks of infection due to a parapoxvirus were reported on eight New Zealand deer farms. Scabby lesions were seen variably on the muzzle, lips, face, ears and neck of red deer (Cervus elaphus) with morbidity rates reaching 100%. On three farms multifocal lesions were also present on the velvet. Deaths were reported on two properties where the lesions were extensive and secondary bacterial infections had occurred. On one of these farms multifactorial disease was suspected. Poxvirus particles were seen by negative contrast electron microscopy in scab material from all eight properties. Morphologically the deer virus resembled a parapoxvirus, but restriction endonuclease analysis showed its DNA fragment patterns were distinct from those of orf (contagious ecthyma) virus.  相似文献   

Ocular chemistry     

Adler AJ 《Science (New York, N.Y.)》1991,253(5024):1153

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Atomic force microscopy of atomic-scale ledges and etch pits formed during dissolution of quartz     

Gratz AJ  Manne S  Hansma PK 《Science (New York, N.Y.)》1991,251(4999):1343-1346

The processes involved in the dissolution and growth of crystals are closely related. Atomic force microscopy (AFM) of faceted pits (called negative crystals) formed during quartz dissolution reveals subtle details of these underlying physical mechanisms for silicates. In imaging these surfaces, the AFM detected ledges <1 nanometer (nm) high that were spaced 10 to 90 nm apart. A dislocation pit, invisible to optical and scanning electron microscopy measurements and serving as a ledge source, was also imaged. These observations confirm the applicability of ledge-motion models to dissolution and growth of silicates; coupled with measurements of dissolution rate on facets, these methods provide a powerful tool for probing mineral surface kinetics.  相似文献   

A study of periodontal disease in sheep over a twelve month period     

Laws AJ  Frisken KW  Orr MB 《New Zealand veterinary journal》1988,36(1):32-34

Sheep affected by broken mouth periodontal disease (P.D.) were examined over a twelve month period for different clinical parameters. It is suggested that P.D. in sheep is an episodic phenomenon similar to human P.D., and that only a few animals with signs of P.D. may undergo clinically significant destruction over a yearly period. No single parameter could reliably predict future deterioration in other parameters.  相似文献   

Rapid growth of magnesium-carbonate weathering products in a stony meteorite from antarctica     

Jull AJ  Cheng S  Gooding JL  Velbel MA 《Science (New York, N.Y.)》1988,242(4877):417-419

Nesquehonite, a hydrous magnesium carbonate, occurs as a weathering product on the surface of the Antarctic meteorite LEW 85320(H5 chondrite). Antarctic meteorites have resided on the earth for periods of 10(4) to 10(6) years, but the time needed for weathering products to form has been uncertain. Isotopic measurements of delta(13)C and delta(18)O indicate that the nesquehonite formed at near freezing temperatures by reaction of meteoritic minerals with terrestrial water and carbon dioxide. Results from carbon-14 dating suggest that, although the meteorite has been in Antarctica for at least 3.2 x 10(4) to 3.3 x 10(4) years, the nesquehonite formed after A.D.1950.  相似文献