Effects of N-methyl-D, L-aspartate on secretion of growth hormone-releasing hormone from the boar hypothalamic-preoptic area and median eminence in vitro

N-methyl-D, L-aspartate (NMA) elicited secretion of growth hormone (GH)-releasing hormone from both the hypothalamic-preoptic area and the median eminence that were collected from boars. We suggest that the previously described increase in GH secretion that follows peripheral treatment of swine with NMA is attributable, at least in part, to NMA-stimulated secretion of GH-releasing hormone from the central nervous system.     

发挥第二课堂的作用培养学生创新素质和能力

笔者通过对创新能力和创新素质内涵的各种研究观点的总结分析,初步论述了大学生第二课堂目标的核心和实质。通过对高校大学生创新素质和能力以及创新实践活动的现状分析,提出了提升大学生第二课堂主阵地效能培养学生创新素质和能力的措施。     

基于Web技术的中国竹子网Access数据库建设

在对中国竹子网(www.chinesebarnboo.net)前期建设及其他竹子网站数据量分析的基础上,使用Access 2000建造了中国竹子网站数据库其内容为:竹业人士、竹子企业、图书架、期刊论文及其Web访问页。     

Beyond electronic feeding: The implementation of call feeding for pregnant sows

Call feeding for pregnant sows is a novel modular extension of a conventional electronic feeder (PigTek INTEC MAC) communicating via ISOagriNET. The call feeding module (CFM) assigns individual calls to each animal of a group supplied by one feeder and trains them to associate that call with feed access. Afterwards it actively calls sows to the feeder in a variable sequence in order to minimize queuing and thereby reducing aggression, stress and injuries associated with feeding. In this paper, we describe the automatic training procedures, the principal technical design and implementation details that make call feeding applicable in practice. The automatic training consists of an initial Pavlovian conditioning during standard electronic feeding and a subsequent operant conditioning. During Pavlovian conditioning the sows may enter the feeder whenever they have remaining feed allowance. An individual acoustic signal is then played immediately before the feed is dispensed. In the operant training the sow learns by experience that she can enter the feeder only after the individual acoustic signal has been presented. The training modes and their durations are individual to each sow’s learning success. Undersupply with feed due to incomplete learning is prevented by the training routines without manual intervention by controlling automatically the proportion of operant and Pavlovian conditioning. Thus, introducing call feeding in an existing herd is possible. The implementation is further able to estimate roughly the social hierarchy and incorporates this in the calculation of the call sequence in order to attenuate feeding associated aggressions. It helps to provide the animals with a positive anticipation of safe feeding and thereby offers a suitable way to improve welfare and health of pregnant sows. Being automatically controlled, it is easy to apply and has the potential to become a promising future element of precision livestock farming.     

渔业统计数据网上发布的实现技术

通过对访问Web数据库的现有技术进行分析与比较,着重介绍借助Web服务器以及Windows NT操作系统和IIS Internet管理系统,采用ASP(Active Server Pages)技术开发Web程序的技术方法,从而实现渔业统计数据库的动态访问。应用该技术可使广大互联网用户快捷进行渔业统计信息的查询。