Sulfonamides in the control of salmonelloses of chicks and poults     

POMEROY BS  FENSTERMACHER R  ROEPKE MH 《Journal of the American Veterinary Medical Association》1948,112(853):296-303

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Triennial Meeting of the International Astronomical Union     

Shapley H 《Science (New York, N.Y.)》1948,108(2812):553-554

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The right oviduct in chickens     

WEBSTER HD 《Journal of the American Veterinary Medical Association》1948,112(852):221-223

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THE MEASUREMENT OF THE EXTERNAL FORCE IN WALKING     

Elftman H 《Science (New York, N.Y.)》1938,88(2276):152-153

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THE NEED OF MORE WELL-TRAINED PRACTITIONERS OF MEDICINE     

Ochsner EH 《Science (New York, N.Y.)》1925,62(1617):573-578

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A STANDARDIZATION OF OSMOTIC PRESSURE AS A TERM     

Eyster HC 《Science (New York, N.Y.)》1940,92(2382):171-172

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双重关系——社会工作中专业关系的伦理困境     

沈黎  刘斌志 《四川畜牧兽医学院学报》2006,4(4):98-100

伦理是社会工作中的重要议题。在实务领域中，当社会上作者与案主不单是两者之间的专业关系，而产生了朋友、雇主、师生、商业伙伴甚至性伙伴等关系的时候，他就陷入了双重关系的困境。文章从美国社会工作伦理守则历次修订对此的限制入手。完整介绍双重关系的定义与分类，并提出处理双重关系的办法与建议。  相似文献   

海拔梯度对台江方竹发笋节律的影响研究   总被引：1，自引：0，他引：1  

马光良王光剑  李呈翔向天洪 胡建明 《世界竹藤通讯》2006,4(1):13-17

通过原产地对合江方竹不同海拔梯度发笋节律的观察和研究，得出其开始发笋期、停止发笋期及发笋数都随着海拔梯度的变化有显著或极显著的差异，海拔越高，发笋越早，停止发笋期也越早，平均发笋量3300株／667m^2。其发笋期可以划分为开始期、高峰期和停止期阶段。在海拔l200In以L开始发笋期出现在9月中旬，停止生长期出现在10月上旬；1000m以一卜开始发笋期、停止生长期分别出现在9月下旬和10月底以后；随着海拔高度平均每降低100m，开始发笋期推迟2—3d，停止发笋期随着海拔高度平均每降低100m推迟3—4d。数学模型（以9月13日为第一天），发笋开始期为K=31．333-0．02383H海拔，停止发笋期为T=64．867-0．03217H海拔；合江方竹在不同海拔梯度的发笋性状可以划分成900m以下和900m以上两类，其中900m以下具有“笋期晚发笋多（晚多）”特性；900m以上具有“笋期早发笋少（早少）”特性。  相似文献   

棉籽粕营养成分最新调查     

宋建国  Park W.Waldroup  Jarrod H.Kersey 《国外畜牧学(猪与禽)》2003,23(3):6-8

本介绍了对棉籽粕养分含量的最新调查结果，数据包括了平均值和变异范围。本应该对考虑在日粮中应用棉籽粕的营养师具有价值。  相似文献   

Effects of dietary vitamin K levels on bone quality in broilers.     

Caiyun Zhang  Defa Li  Fenglai Wang  Tao Dong 《Archives of Animal Nutrition》2003,57(3):197-206

This study was conducted to evaluate the effects of dietary vitamin K (menadione) on bone quality in cage-raised broilers. Three hundred and sixty male broilers were randomly allotted to one of six treatments, with six replicate pens per treatment and 10 chicks per pen. Broilers were fed one of six diets including a control diet or the control diet plus graded levels of vitamin K (0.5 mg/kg, 2 mg/kg, 8 mg/kg, 32 mg/kg and 128 mg/kg). Water and feed were provided ad libitum during the 7-week experimental period. Results indicated that vitamin K supplementation of broilers diets significantly effected bone quality and feed efficiency. The treatment containing vitamin K at 8 mg/kg improved growth performance (during weeks 6-7) and bone quality (during weeks 0-3). In our study, hydroxyapatite binding capacity of serum osteocalcin (during weeks 0-3), bone breaking strength, bone flexibility, bone ash weight increased linearly (P < 0.05) and bone mineral density, bone mineral content increased quadratically (P < 0.05) with increasing supplementation of vitamin K. In conclusion, to gain optimum bone quality and broiler performance, our studies suggest that the concentration of vitamin K in broilers diets should be 8 mg/kg, 2 mg/kg, and 2 mg/kg, for the starter, grower and finisher phases, respectively. Furthermore, it was shown that the starter period is an important phase for improving bone quality. In addition, this study validated the mechanism of vitamin K effects on bone quality. Vitamin K boosts the carboxylation of osteocalcin and decreases the concentration of serum under-carboxylated osteocalcin enhancing hydroxyapatite binding capacity of serum osteocalcin and improving bone quality.  相似文献