Investigations of the digestibility of proximate composition in commercial palm kern meal in broiler chick rations

The digestibility for crude protein, ether extract, crude fibre, ash and nitrogen-free extract were determined for palm kernel meal samples. The test diets, identified as DA, DB and DI, were formulated to contain 10%, 20% and 40% palm kernel meal, respectively. With the exception of crude fibre and crude protein the digestibility of the nutrients of the diets decreased significantly as the dietary fibre content increased.     

Inhibition of bovine lymphocyte response to phytohemagglutinin by a specific 5-lipoxygenase inhibitor

AA861, a specific 5-lipoxygenase inhibitor, inhibited bovine lymphocyte response to phytohemagglutinin (PHA). Mitogen-stimulated cultures of mononuclear cells produced leukotriene B4 (LTB4) in 24 hours. The production of LTB4 was completely inhibited by concentrations of AA861 that inhibited mitogen-induced 3H-thymidine incorporation. The inhibition of lymphocyte proliferation was totally reversed by LTB4 but not by leukotriene C4 or leukotriene D4. The inhibition of interleukin-2 (IL-2) production by AA861 was also completely reversed by addition of exogenous LTB4 to lymphocyte cultures. Thus, endogenous LTB4 production appeared to be necessary for PHA-induced IL-2 production and lymphocyte proliferation.     

全价饲料、浓缩饲料和饲料添加剂中维生素A的HPLC分析

配合饲料、浓缩饲料或予混添加剂中的维生素 A 经过碱性皂化作用、乙醚提取和蒸干后,溶于甲醇中,然后在 HPLC 上利用萤光检测仪在 Ex=325nm;Em=480nm 条件下进行了测定。测定所用条件为:固定相:Spherisorb ODSⅡ;流动相:甲醇:水=90:10;流速1.00ml/min。维生素 A 保留时间5.3分钟。测定结果表明,维生素 A 的回收率在94%以上,不同饲料样本变异系数(CV%)范围在4.1-7.5之间。     

Control of benomyl-resistant strains of Colletotrichum coffeanum, the cause of coffee berry disease

Sprays containing difolatan, dithianon, chlorothalonil and cuprous oxide were tested for the control of coffee berry disease (CBD) in 1979 and 1980 at an estate in Kenya with abundant benomyl-resistant strains of Colletotrichum coffeanum. In 1979 all fungicides gave good CBD control and increased yields of coffee. In 1980 only difolatan increased yield. Isolates of C. coffeanum capable of growing on agar with 8 μg/ml benomyl were detected throughout the 2 years of these trials.     

Industrieschau

Ohne Zusammenfassung     

Suppressive effect of Azotobacter chroococcum on Rhizoctonia solani infestation of potatoes

Isolates ofAzotobacter chroococcum were found to be promising for the control of infestation of potato plants withRhizoctonia solani. Inoculation with an isolate ofVerticillium biguttatum in combination with isolates ofA. chroococcum effectively protected sprouts, stems and stolons against infestation withR. solani. The effect of inoculation varied with soil temperature.No sclerotia were formed on potatoes harvested from soil in pots inoculated with isolates ofA. chroococcum plusV. biguttatum under glasshouse conditions; the yield increased significantly over the control.Samenvatting Enkele isolaten vanAzotobacter chroococcum bleken sterk antagonistisch ten opzichte vanRhizoctonia solani en leken goed bruikbaar voor een biologische bestrijding van deze ziekteverwekker van de aardappel.Beënting van de grond metVerticillium biguttatum enA. chroococcum gaf — in potproeven — een effective bescherming van spruiten, stengels en stolonen tegen aantasting doorR. solani.De vorming van sclerotiën bleef achterwege op knollen die gevormd waren in grond die was beënt metA. chroococcum plusV. biguttatum. De opbrengst uit behandelde grond was hoger dan die uit onbehandelde.De effectiviteit van de behandeling is afhankelijk van de temperatuur.