“刘易斯—费景汉—拉尼斯”模型与二元结构下的乡镇企业发展

本文就“刘—费—拉”二元经济模型。提出我国乡镇企业发展模式，揭示其发展约束—金融市场缺憾，并就其发展前景作一初步探讨。     

不同pH值对从羽毛粉水解液中提取磺基丙酸得率影响的研究

本研究探索了不同ｐＨ值对氧化后羽毛粉水解液中提取磺基丙酸得率的影响，结果表明：用等电点沉淀分离水解液中的磺基丙酸是可行的，当水解液ｐＨ值调到４．６～４．７时，其得率及纯度高。经过二次结晶制得了纯度为６５．０５％的磺基丙酸制剂     

疑似犬传染性支气管炎暴发的病例报告

<正>近日,某基地及周边60余头工作犬暴发了以强烈阵咳、呕吐白色粘液、发热、传播迅速为主要特征的急性呼吸道疾病。时值甲型H1N1流感高发季节,我们及时采取综合治疗措施,在较短的时间得到有效控制,并     

山羊亚硝酸盐中毒口液,尿液,棉签偶氮显色快速诊断方法的研究

建立山羊亚硝酸盐中毒模型,用棉签分别蘸取口液、尿液立即滴加偶氮试剂均显粉红色,中毒后１０～２０ｍｉｎ显浅粉红色;６０ｍｉｎ显深粉红色,随中毒症状加重,棉签显色相应加深,甚致变为棕红色。同时棉签显色加深和血液褐变程度加重与ＭＨｂ／Ｈｂ比值升高同步。此种诊断方法是诊断亚硝酸盐中毒的动物可靠、灵敏和快速的诊断方法。     

酸性洗涤纤维和木质素测定的国际标准

多年来,畜牧营养学家一直利用酸性洗涤纤维（ADF）和中性洗涤纤维（NDF）作为饲料能量和采食量的指示剂,特别是在反刍日粮中。     

犬乳腺肿瘤病的诊治1例

乳腺肿瘤是母犬最为常见的一类疾病,老龄母犬多见,公犬少见。美国的一项调查发现,乳腺肿瘤占犬类所有肿瘤的13．4％,而这些肿瘤有41．7名发生于未节育的母犬。据统计,纯种犬发病率高于杂种犬。肿瘤中恶性肿瘤约占40％。     

分子连锁图与家蚕育种

本文概要介绍QTL概念、分子标记及其分子图的构建方法,通过大量的动植物QTL定位取得的成绩以及家蚕分子标记和分子图研究现状的阐述,展望了家蚕分子育种的前景。     

Pharmacokinetics and bioavailability of valnemulin in broiler chickens

Wang, R., Yuan, L.G., He, L.M., Zhu, L.X., Luo, X.Y., Zhang, C.Y., Yu, J.J., Fang, B.H., Liu, Y.H. Pharmacokinetics and bioavailability of valnemulin in broiler chickens. J. vet. Pharmacol. Therap. 34 , 247–251. The objective of this study was to investigate the pharmacokinetics and bioavailability of valnemulin in broiler chickens after intravenous (i.v.), intramuscular (i.m.) and oral administrations of 10 mg/kg body weight (bw). Plasma samples were analyzed by high‐performance liquid chromatography–tandem mass spectrometry (HPLC‐MS/MS). Pharmacokinetic characterization was performed by non‐compartmental analysis using WinNonlin program. After intravenous administration, distribution was wide with the volume of distribution based on terminal phase(V_z) of 4.27 ± 0.99 L /kg. Mean valnemulin t_1/2β(h), Cl_β(L /h /kg), V_ss (L /kg) and AUC_(0–∞)(μg·h /mL) values were 2.85, 0.99, 2.72 and 10.34, respectively. After intramuscular administration, valnemulin was rapidly absorbed with a C_max of 2.2 μg/mL achieved at 0.43 h (t_max), and the absolute bioavailability (F) was 88.81%; and for the oral route the same parameters were 0.66 ± 0.15 μg/mL, 1.54 ± 0.27 h and 74.42%. A multiple‐peak phenomenon was present after oral administration. The plasma profile of valnemulin exhibited a secondary peak during 2–6 h and a tertiary peak at 32 h. The favorable PK behavior, such as the wide distribution, slow elimination and acceptable bioavailability indicated that it is likely to be effective in chickens.     

驴同期发情初探

毛驴的妊娠期特别长(360 d左右),繁殖率低,毛驴资源将日趋匮乏.因此,有必要对毛驴进行同期发情研究,以增加毛驴数量.