蒙古栎秋播种育苗技术的研究

自１９９３年起对本局大趟子苗圃进行了蒙古栎秋播育苗试验,并对蒙古栎从采种、种子调制、田间管理及起苗、留床、造林等环节上形成了一套完整的科学育苗方法,避免了春播育苗种子储藏和鼠害等一系列不利问题,研究探索了最佳播种量和最佳经营密度。     

草莓快速繁殖技术的研究

本文探讨了利用茎尖离体培养法进行草莓快速繁殖的方法。主要摸索了激素对试管苗的分化、生根的影响及移栽成活的技术要点。     

西南大学教学秘书心理健康问题初探

通过对西南大学教学秘书的工作内容及心理健康状况的调查,分析其心理健康状况欠佳的原因,并分别从领导层和教学秘书自身两方面提出改善措施。这对于改善高校教学秘书的心理健康状况,提高管理工作效率有着重要参考意义。     

坡耕地地表糙度的量测与计算

在回顾了地表糙度的测量和计算方法后,经实验证实,Brough D L,Linden D R和Van Doren D M等人提出的糙度测量和计算方法,均能满足黄土高原坡耕地人为耕作管理形成的微地形特征的研究需求。     

Influence of storage time and processing on chemical composition and in vitro ruminal fermentation of olive cake

Olive oil extraction generates olive cake (OC) that could be used in ruminant feeding. However, the chemical composition of OC is affected by multiple factors, being therefore highly variable. The objective of this study was to analyse the influence of storage time and further processing: crude, exhausted (subjected to a second oil extraction) and cyclone (obtained from a cyclone separator) on nutritive value of OC samples. Twelve samples (six crude and six exhausted) were obtained monthly from the same pond from 1 to 6 storage months, and nine samples (three crude, three exhausted and three cyclone) were obtained monthly from a different pond from 6 to 9 months storage. Chemical composition was analysed, and OC samples were fermented in vitro with sheep rumen fluid. Increasing storage time up to 6 months decreased sugars and total soluble polyphenols content but increased fibre content in OC. Dry matter effective degradability (DMED) decreased linearly (p < 0.001) by 35.9 and 45.5% as storage time augmented from 1 to 6 months for crude and exhausted OC, respectively. Crude OC had lower DMED values than exhausted OC (averaged values 0.255 and 0.294 g/g, respectively). Both potential production and rate of gas production were lower (p ≤ 0.018) in crude compared with exhausted OC, which was attributed to the high fat content of crude OC (≥86 g/kg dry matter). For samples stored longer than 6 months, cyclone had greater (p < 0.05) DMED than crude and exhausted OC (averaged values 0.207, 0.164 and 0.164 g/g, respectively). The results indicate that ruminal degradability of OC is reduced with advancing storage time, but only subtle changes were observed during the first two months. Cyclone showed greater degradability than crude and exhausted OC, but differences between crude and exhausted OC became negligible after five storage months.     

牛烂蹄坏尾病致病弯角镰刀菌代谢产物分离鉴定

取金寨县耕牛烂蹄坏尾病致病弯角镰刀菌的玉米培养物，用丙酮提取，硅胶净化，制备型硅胶大板分离，得到无色针状结晶体，经质谱和红外光谱分析，并经相关谱图数据库联机检索、甄别，按其分子量、化学式及结构式确定为麦角甾醇，从而证实了致牛烂蹄坏尾病的弯角镰刀菌可产生麦角甾醇。     

对退耕还林工程中种草的探讨

分析种草在退耕还林工程中的重要地位和作用 ,提出退耕种草的草种选择和种植模式 ,并探讨发展草产业的途径和方向     

双峰驼精清诱导排卵活性成分的DEAE—纤维素柱层析分离及其生物活性

选用DEAE－纤维素离子交换柱对双峰驼精清进行分离，各层析组分用于大鼠垂体组织体外培养，并给母驼肌注有活性的组分，以RIA法测定垂体组织培养液和母驼血浆中LH及FSH的浓度。结果表明，驼精清经DEAE－纤维素柱分离后可得到5个蛋白组分（L1－L5），其中L3在大鼠垂体培养时引起LH释放明显增加（P＜0．05），FSH则无明显变化。给卵巢上无大卵泡发育的母驼肌注有活性的组分L3，可引起血浆中LH明显升高，FSH也无变化。由此表明，L3在体内外试验中均具有引起LH释放的生物活性，它可能是诱导排卵的活性因子或其成分之一。     

奶牛人工授精的优缺点和技术要点

奶牛人工授精技术加速了奶牛品种改良进程,实现了将优秀种公牛精液跨区域、超时限的利用共享,极大地促进了养牛业的发展.以奶牛人工授精应用现状为出发点,介绍了人工授精技术的优点和不足,最后结合自身工作经验,从发情鉴定、适时配种、精液解冻、精液检测、输精、精液保存和妊娠检测等技术要点进行概述,以期更好地促进奶牛人工授精技术的应...     

添加亚油酸条件下不同剂量硝酸钠对水牛瘤胃体外发酵脂肪酸组成及相关微生物数量的影响

为了探究添加亚油酸条件下不同剂量硝酸钠对水牛瘤胃体外发酵脂肪酸组成及相关微生物数量的影响,本试验选用3头装有永久性瘤胃瘘管的母水牛,以精粗比40:60为底物进行瘤胃液体外发酵试验.试验组硝酸钠的浓度分别为1、2、3 mg·mL-1,对照组不加硝酸钠,每组均添加0.25 mg·mL-1的亚油酸,每组各5个重复.在体外培养...