天府肉鹅新品系绒羽特性的研究

本试验采用天府肉鹅父系、母系为材料，测定了9-17周龄绒羽的生长发育及理化特性。结果表明，父系的产线性能优于母系．17周龄时，父系的绒重、毛绒重分别比母系高71．4％和35．8％，含水率、含脂率明显低于母系。第一次活体羽的适宜时间为13或14周龄。本文还就羽绒生长性状间的相关性进行了分析。     

用丰、稳指数法综合评定水稻品种的丰产性和稳产性

本文用估算品种丰、稳指数的方法、综合评定汕优_（６３），Ｄ优_（６３），Ｄ优１０号，协优６３和Ⅱ－３２Ａ×明恢６３的丰产性和稳产性，分析结果表明：（１）五个品种的离回归方差不显著，稳产性较好，（２）汕优６３，Ｄ优_（６３），Ｄ优１０号，协优_（６３）和Ⅱ－３２Ａ×明恢_（６３）的丰稳指数分别为：１０１．３３７，９７．９７８，１０３．１９８，９６．０８７，９９．３４１；以汕优６３为对照，Ｄ优１０号，Ｄ优６３，协优６３Ⅱ－３２ＡＸ明恢６３的丰稳指数优势率分别为：２．４３％，－３．３１％，－５．１８％，－１．９７％，（３）五个品种的丰，稳产性“权”比分别为：丰产性“权”比为６７．７１，稳产性“权”比为３２．２９。并以汕优６３为对照，对其余四个品种作了优势区间分析。     

三种长效磺胺药在水牛体内的代谢动力学

<正> 磺胺—5,6—二甲氧嘧啶(SDM')为人用的周效磺胺。在奶山羊体内的代谢动力学已进行了研究。磺胺—5—甲氧嘧啶(SMD)和磺胺—6—甲氧嘧啶(SMM、DS—36)亦为人用长效磺胺。SMM在鸡体内的分布、在牛、猪的血中浓度、血浆蛋白结合率如乙酰化率、对马和奶山羊体内的代谢动力学已进行了研究。     

鸡鸭钙磷缺乏症的比较病理学

６０只四日龄ＡＡ肉鸡和６０只一日龄天府肉鸭各分为三组,分别喂给缺钙（鸡Ｃａ０．０２％,Ｐ０．７１％;鸭Ｃａ０．１２９％,Ｐ０．６５％）、缺磷（鸡Ｃａ０．９５％,Ｐ０．３０％;鸭Ｃａ０．８０％,Ｐ０．３６６％）和正常对照（鸡Ｃａ０．９５％,Ｐ０．７１％;鸭Ｃａ０．８０％,Ｐ０．６５％）日粮,进行比较病理学观察。其结果：鸡鸭钙缺乏和磷缺乏特征性肉眼变化见于肋骨,是实验观察中获得的最新成果。钙缺乏,鸡肋骨增粗变圆,质软弯曲呈“Ｖ”字形,鸭肋骨内表面出现佝偻珠;而磷缺乏时,鸡肋骨头肿大呈串珠状,鸭肋骨质软弯曲突入胸腔。长骨组织学变化,缺钙鸡鸭相同但与缺磷鸡鸭明显不同,前者骺生长板之增生带增宽,于骺端类骨组织和结缔组织大量增生,成骨细胞和破骨细胞增多;缺磷鸡鸭长骨骺生长板之肥大带增宽,于骺端类骨组织增生。临床病理学变化表现为血清碱性磷酸酶活性异常升高,血清钙含量（缺钙鸡鸭）和磷含量（缺磷鸡鸭）及骨灰分、灰分钙磷含量显著降低,上述结果为鸡鸭缺钙和缺磷的鉴别诊断提供了科学依据。本文还讨论了临床症状与病变的关系及发病机理。     

七彩山鸡早期生长发育的研究

本试验对七彩山鸡011周龄的胫长和体重的生长规律进行了研究，并探讨了公母分养与公母混养及四种密度不同的饲养管理方式下，胫长和体重的生长规律。结果表明，体增重、胫增长的趋势与其它同类研究结果相似，但体增重的高峰推迟了三周左右出现，分析为前几代未进行系统选育所致．对胫长、体重的相关分析表明，除与出壳相关的项目外，其余周龄间均呈高度相关，胫长各周龄间的相关高于体重．胫长与体重间也呈高度相关。公母分养有利胫长和体重的生长，并产生极显著效果，体重的效果稍大于胫长．不同密度的饲养对胫长和体重的生长产生不同的效果，并且，对体重的影响其差异达到显著水平．     

白榆优良无性系木材物理力学性质的主成分分析

以１４个白榆优良无性系木材物理力学性质测试数据为研究材料,采用主成分分析方法,将影响白榆木材物理力学性质的１２个指标分为强度指标和干缩指标两大主成分。讨论了年轮宽度与木材强度性能和干缩性能的关系。同时对前两个主成分坐标值采用排序聚类,将１４个无性系划分为３类。因而对白榆的选种育种及工业用材的定向培育生产具有指导意义。     

烯效唑拌种对小麦形态及营养的调节效应

本文研究了烯效唑拌种对小麦形态及营养的效应。结果表明：烯效唑具有控上促下的作用,前期形成了健壮发达的根系;同时又具有控前促后的作用,使后期叶面积、干物重、碳氮比均有提高,为穗粒的形成提供了充足的营养,进而使产量提高。     

Fire and the dynamics of a semi-arid grassland: influence on soil characteristics

The short-term impact of fire burning with the wind (head fire) and against the wind (back fire) on soil characteristics (soil-water content, soil compaction, soil temperature, organic matter, pH, exchangeable Ca, Mg, K, Na and extractable P) were determined in a semi-arid grassland. This study was conducted over two growing seasons (2000/01 and 2001/02) after only one burning treatment in August 2000. The back fire moved approximately 7.5 times slower than the head fire, leading to the greatest change in hydrological characteristics. The decline in plant cover due to the fire resulted in a considerable increase in soil compaction, soil temperature and a decrease in organic material in turn leading to a lowered soil-water content. Much of the influence of these variables had not been completely reduced two growing seasons after the fire. Burning reduced the soil-water content (0mm to 300mm soil depth) after one month and one year by 13.4% and 31% respectively. Temporary wilting for all grass species occurred more rapidly with burning. During March of the first year, the greatest soil temperature difference (50mm depth) occurred between burnt and unburnt grassland, with the highest soil temperatures recorded in January. The highest temperature on the surface of the soil for each year after burning also occurred during January. Over the first growing season burning significantly reduced organic carbon (C) and total nitrogen (N) content and extractable phosphate, but increased the pH and concentration of exchangeable Ca, Mg, Na and K in the soil, over the first 0–50mm layer. There were no differences in the soil properties of head and back fires, except for organic material that was further lowered by the back fire. With depth, organic matter and K decreased significantly and Ca increased between surface (0mm to 50mm) and lower (50mm to 100mm) layers due to burning. Thus, an unplanned event can increase the intensity and frequency of seasonal droughts in the ecologically sensitive semi-arid grassland areas leading to increase risk management in the short-term.     

氨基甙类及青霉素类抗生素在水牛体内代谢动力学的研究

链霉素用水牛5头,卡那霉素用4头,青霉素 G 用5头,苯唑青霉素用4头,氨苄青霉素用4头,一次肌注剂量分别为10mg/kg,10000u/kg,5000u/kg,15ma/kg,10ma/kg。血清中药物浓度测定用管碟法,试验菌种氨基甙类用枯草杆菌,青霉素类用八叠球菌。重要的动力学参数:五种药物的半衰期分别为3.93,2.32,1.02,3.20,1.26小时,峰时分别为1.47,1.32,0.5,0.26,0.38小时,峰值分别为22.67,17.46,9.83,10.51,11.78u/ml;药一时曲线下面积分别为149.54,87.57,22.84,25.92,24.13u/ml.h;血清中药物有效浓度维持时间分别为9.53,7.07,5.9,13.50,7.30小时。     

四环素·红霉素及洁霉素在水牛体内的代谢动力学

<正> 四环素为广谱抗生素,在兽医临床上已广泛应用。四环素在奶牛和母羊以及在黄牛体内的药代动力学已进行了研究。红霉素为大环内酯类抗生素,对革兰氏阳性菌有较强的抗菌作用。红霉素在乳牛体内的代谢动力学已进行了研究。洁霉素(林可霉素)的抗菌谱与红霉素相似,但二者有重要的区别,洁霉素对革兰氏阳性菌有较强的抑制作用。林可霉素及氯林可霉素在奶羊血清及乳中浓度的变化已进行了报导。