加酶益生素可提高肉鸡性能

益生素是由活体微生物制成的生物活性制剂,能有效补充畜禽消化道内的有益微生物,改善消化道内菌群平衡,提高机体抗病能力、代谢能力及对饲料的消化吸收能力．收到防治疾病和促进生长的双重作用。酶是一种生物催化剂,具有促进营养物质消化吸收、提高饲料利用率的作用。最近,有人用加酶益生素词喂肉鸡,取得了明显效果。试验用1020只AA商品代肉鸡、将其随机分成2组．每组510只。一组为试验组,饲喂添加0．2％加酶益生素的配合饲料．另一组为对照组,饲喂不加酶益生素的同种配合词料．试验期为52天。试验结果．试验组肉鸡平均日增重为44…     

添加谷氨酰胺可以提高断奶仔猪的肠屏障功能

由于母源免疫成分消失,接触病原体增加,断奶后的仔猪特别脆弱,胃肠道感染发病率增加。尽管已经证明谷氨酰胺（Gln）可以提高肠屏障功能和免疫功能,但对在断奶期添加Gln关注不多。研究了日粮添加Gln提高早期断奶后仔猪免疫和胃肠道功能及抵御产肠毒素性大肠杆菌攻击的能力。     

用压榨油菜籽粕替代断奶仔猪日粮中的豆粕

加拿大阿尔伯塔大学和墨西哥下加利福尼亚州自治大学联合研究了用压榨（EP）油菜籽粕替代豆粕作为能量和氨基酸来源对断奶仔猪生长性能和日粮营养物质消化率的影响。研究用240头初重为7．3±0．6kg的断奶仔猪。     

用口腔液样品检测猪胸膜肺炎放线杆菌

根据美国明尼苏达大学最近进行的一项研究表明,检测口腔液样品有可能成为排查胸膜肺炎放线杆菌、猪副嗜血杆菌和猪链球菌等猪病原体的工具。     

Bioguided fractionation and isolation of free radical scavenging components from in vitro propagated chinese medicinal plants Dendrobium tosaense Makino and Dendrobium moniliforme SW

This study was performed to investigate the free radical scavenging active components from in vitro propagated medicinal herbs of the genus Dendrobium, namely, Dendrobium tosaense Makino and Dendrobium moniliforme SW, using a 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical antioxidative assay. Seeds of the capsules derived after 12 weeks of hand-pollination germinated asymbiotically (50-74%) on half-strength Murashige and Skoog's (MS) basal medium with 3% sucrose and solidified with 0.9% Difco agar. Active growth in the germinated seedlings was achieved by reculturing on full-strength MS basal medium supplemented with 8% banana homogenate, 8% potato homogenate, 8% coconut water, 1.5% sucrose, and 0.9% Difco agar. Healthy plantlets transferred to plastic trays containing moss or moss and tree fern successfully acclimatized (84-100%) in the greenhouse. Extracts were prepared from plants grown in the greenhouse for a period of 6 months. Methanolic extracts of D. tosaense and D. moniliforme scavenged DPPH at 95.9 and 83.4%, respectively, at a concentration of 0.4 mg/mL. Therefore, methanolic solubles of D. tosaense and D. moniliforme were subjected to bioguided fractionation and separation by column chromatographic methods individually. After chromatographic separation of these crude extracts, the obtained fractions (Dm 1, Dm 2, Dm 3, Dt 1, Dt 2, and Dt 3) were tested for their activity. Among them, fractions Dm 2 and Dt 1 showed significant antioxidant activity by DPPH radical antioxidative assay. Active fractions were purified further by column chromatography and resulted in identification of the antioxidant components alkyl ferulates from D. moniliforme and quercetin from D. tosaense.     

早期断奶仔猪VB6的需要量

为了研究日粮添加VB6对早期断奶仔猪和吡哆醇状态的影响,作者给12头2周龄断乳并装有永久胃管的仔猪饲喂添加0、10、50或100ppmVB6于含2.7ppmVB6的基础日粮,共饲喂2周。结果,饲喂添加VB6