果用桑品种育种研究概况

我国已收集保存了果桑资源200多份(包括人工创制的四倍体资源),绝大部分属广东桑和白桑.对果桑资源进行了有关经济性状和理化性状调查及营养成分分析.选育出了大10、穗果2号、红果1号、秦椹1号、DL-1等果用桑品种.     

适合亚热带蚕区饲养的三眠蚕育种材料选择

为了培育适合亚热带蚕区生产高品位生丝的家蚕品种,根据家蚕眠性遗传机制,利用杂交育种及显性三眠纯合技术,将超细纤度三眠蚕品种与夏秋蚕品种杂交育成Z3等细纤度三眠蚕材料,再与多丝量春用蚕品种杂交,初步育成了Z3.C3等纤度为2.44 dtex、全龄经过短、体质强健、茧丝质优良的三眠蚕材料。采用选拔的三眠蚕材料初步组配的Z3×84Y2杂交组合的实验室饲养成绩为:全龄经过21 d,虫蛹率98.55%,全茧量1.75 g,茧层率22.47%,茧丝长1 354 m,解舒率88.15%,洁净95.3分,纤度2.6 dtex。     

美国黑豚养殖技术

美国黑豚属野生皮毛兽种类,是食草哺乳动物,形态小而肥胖,通身黑色与兔十分相似,成龄黑豚体重一般在800g左右,最重可达到1500-2000g,前肢短小,不善跳跃,行动敏捷。皮毛丰厚细密、黑亮光涌,是加工高档裘皮服装和工艺饰品的加工原料,豚肉是味道鲜美的上等佳品,其血液是提取歧氧化酶的最理想原料。具有很高的经济值和利用价值。     

猞猁的人工饲养和繁殖

以江苏省淮安市樱花园(苏北野生动物园)内人工饲养的1对猞猁为研究对象,对其在人工饲养条件下的日粮组成、饲养环境、日常管理、常见疫病防治及繁殖育幼情况的初步小结,以期为今后猞猁在人工饲养条件下的饲养、繁殖工作提供一定的实践依据。     

海兰（褐）父母代种鸡引入青海高寒地区的饲养试验

对从山东引入青海高寒地区的海兰（褐）父母代鸡进行了饲养试验。结果表明,引入鸡32周龄最高产蛋率达78%,25周龄后种蛋受精率达88%,入孵蛋的孵化率达75%,母鸡1～18周龄成活率为94%,19～60周龄成活率为92%。引入鸡的各项指标基本达到山东标准。     

早生桑品种育151、育237的育成

采用杂交方法育成早生桑品种育151、育237,具有发芽早、产叶量高,叶质较优、抗黄化型萎缩病较强等特性,发芽期比早青桑捉早2-3天.比湖桑32号早8天左右.产叶量提高6-41%.     

抗臌胀病紫花苜蓿研究进展

综述了紫花苜蓿中导致瘤胃臌胀病的臌胀因子,包括浓缩单宁、可溶性蛋白和皂角苷,同时阐述了抗臌胀病紫花苜蓿育种研究进展。     

Prediction of intramuscular fat by ultrasound in lean cattle

To study the accuracy and precision of intramuscular fat prediction by ultrasound (USIMF) in lean cattle, prediction models were developed based on 325 pure and crossbred beef and dual purpose bulls originating from I) commercial herds (n = 180) and II) a performance test station (n = 145). The bulls were scanned across the 12th thoracic vertebrae using a Pie 200 SLC scanner. Five images were collected per individual bull for later processing in the lab. After slaughter, a 2.5 cm cross-sectional sample located by the 13th thoracic vertebrae was used for chemical analysis to determine intramuscular fat % (CHIMF; Mean 1.25%, SD 0.6%) at the image site. The data were analysed sequentially involving 1) the Total Dataset, 2) Dataset I and 3) Dataset II. Prediction models were developed separately for each dataset, using stepwise regression procedures. The validation model R², RMSE, overall mean bias, SEP, r_P and rank correlations for CHIMF and USIMF based on the best prediction model (Dataset I) were 0.48, 0.46%, − 0.02%, 0.46%, 0.70 and 0.67, respectively. Further improvement in prediction accuracy can probably be achieved by increasing the size of datasets and the CHIMF variation. The results strongly indicate that ultrasound has potential for IMF prediction in lean cattle, although the value in indirect selection of breeding cattle for meat quality needs to be further evaluated.     

坪用野牛草种质资源搜集及品种选育研究进展

野牛草是一种抗逆性强、管理粗放的草坪植物,非常适合我国一些缺水城市水土保持和园林绿化的需要,但也存在绿期较短、颜色较浅、雄株坪用景观不好等缺点.近年来,通过对野牛草种质资源进行鉴定和评价,从中选择了大量优良的种质材料,使其坪用缺点逐步改善,并利用有性杂交和生物技术等育种手段培育出了许多优良坪用品种.