Oil yield and quality variation between sexes in Osyris lanceolata (African sandalwood) and its value as a fodder plant in Tanzania     

《Southern Forests》2013,75(2):69-74

African sandalwood (Osyris lanceolata) is widely harvested in East Africa for extraction of oil, which is used in the fragrance and perfumery industry. Over the years, harvesting of the species has been concentrated to female plants because it is claimed that they yield more and better quality oil compared to males. However, data to support these claims is lacking. Osyris lanceolata is also used extensively by pastoralists as feed supplement during the dry season, yet little information on the species’ nutritive value exists. Oil yield and quality variations between male and female O. lanceolata and its nutritive values were evaluated to ascertain the purported reasons for sex selectivity in harvesting, and to determine the potential value of the species as a fodder plant. Oil yield was determined by extracting oil from a known amount of wood, while quality assessment was done by determining the amount of santalol, a prime determinant of sandalwood oil quality. The species’ potential as a fodder plant was determined by analyzing the nutritive value and digestibility of leaves and fruits. There was no significant variation (p = 0.856) in oil yield between sexes, though populations differed significantly (P < 0.001). The highest oil yield was 9.32 ± 0.611%. Likewise, sexes did not differ significantly (P = 0.655) in oil quality, though populations differed significantly (P < 0.001). The highest santalol content was 11.1%. It is concluded that sex selectivity during harvesting has no relation to oil yield and quality. However, population selectivity is strongly justified due to the huge variation in oil yield and quality, and is likely to be the major reason for over-exploiting some populations. It is recommended that there is a need to refrain from overharvesting of females within populations, since the practice is likely to erode the genetic vigour of the species and affect its sustainability. Nutritive studies revealed the species to have 15.9–19.7% crude protein, 15.9–24.0% crude fibre, 0.77–0.81% fat/oil, 97.5–97.8% dry matter, 8.5–10.3% ash content, 72.2–72.4% digestibility. These figures are within the acceptable range, suggesting that both leaves and fruits of the species are a potential alternative source of animal protein where protein supplements are not available or expensive.  相似文献   

我国地理标志农产品品牌化研究综述及启示   总被引：1，自引：0，他引：1  

徐向龙  王亮 《安徽农业大学学报》2019,28(5):49-55

在乡村振兴战略背景下,地理标志农产品品牌化研究具有重要的实践价值。近十年来的研究主要包括地理标志农产品品牌化的意义和实现路径两个方面。地理标志农产品品牌化作用的研究包括其对区域经济和社会发展的作用以及对消费者购买行为的影响;实现路径研究有对国外的经验启示研究、地理标志农产品公共品牌的保护研究、基于产业集群的发展研究和基于品牌建设和竞争力提升研究等方面。今后需在地理标志农产品管理制度优化和大数据平台建设、地理标志农产品品牌的传播及评估和退出机制等方面进一步拓展研究空间。  相似文献   

基于结构优化的择伐对锐齿槲栎天然林结构与生长的影响     

张保全  段丰沛  郭小龙  刘文桢  张婷 《西北林学院学报》2023,38(1):160-167

以甘肃小陇山林区锐齿槲栎天然林为对象,分析基于结构优化的择伐方式林分和未择伐林分的树种组成、生物多样性、径级结构、空间结构及生长之间的差异。结果表明：1)2008-2018年,择伐后的林分密度、平均胸径、平均树高、胸高断面积和树种数均呈现出先下降后增加的趋势,而Shannon-Wiener指数值和Pielou均匀度指数呈现增加的趋势;未择伐样地林分的密度、树种数、Shannon-Wiener指数值和Pielou均匀度指数呈现下降的趋势,而平均胸径、平均树高和断面积呈现增加的趋势;2)择伐样地和未择伐样地10 a间林木径级分布结构和林木的分布格局没有改变;而择伐样地的林木混交程度不断提高,未择伐样地的林木混交程度下降;3)2次调查间隔期内,择伐样地的胸径平均相对生长率分别较未择伐高18.4%和55.2%,胸高断面积相对生长率分别较未择伐高18.2%和54.4%;4)2008-2013年,择伐样地的进阶率和死亡率均高于未择伐样地,而在2013-2018年,择伐样地死亡率大幅下降。5)择伐样地和未择伐样地内各径级间的胸径平均生长率呈现随径级的增加而下降的趋势,且各径级间差异显著。择伐样地和未...  相似文献   

汉源花椒地理标志产品综合监管和品牌提升的思考     

胡文  孙昀桦 《四川林勘设计》2019,(4):40-41,45

为促进汉源花椒绿色产业规模发展,提升产品品牌效益和市场价值,促进高山地区农村经济发展和乡村振兴,文章探讨了加强汉源花椒地理标志产品综合监管、提升地理标志产品品牌效应以及保障生产销售的具体措施。  相似文献   

Sward patterns created by patch grazing are stable over more than a decade     

Bettina Tonn  Christoph Raab  Johannes Isselstein 《Grass and Forage Science》2019,74(1):104-114

Under extensive grazing, a mosaic pattern of frequently defoliated short patches and rarely defoliated tall patches is often formed. The agronomic and ecological consequences of this patch‐grazing pattern strongly depend on its stability between successive years. We assessed patch structure and temporal stability under three intensities of cattle stocking (moderate, lenient and very lenient) in a cattle grazing experiment established in 2002. Aerial images of the whole area taken in 2005, 2010, 2013 and 2015 were classified into short and tall patches using random forest classification. These were complemented by annual sward height measurements (2007‐2017) at 10 permanent plots per paddock, which were classified into sward height classes. The mean proportion (0.72, 0.32, 0.19) and size of short patches decreased with stocking intensity, while size of tall patches increased. Inter‐annual stability depended on patch type and stocking intensity and was particularly high for the respective dominant patch type. Of the short patch area in 2015, 0.62, 0.29 and 0.30 were classified as short in all four aerial images under moderate, lenient and very lenient grazing, respectively; the corresponding proportions for tall patches were 0.10, 0.53 and 0.65. Our results imply that short and tall patches experience persistent differences in local grazing intensity over extended periods. The long‐term effects of this heterogeneity on soil properties and vegetation composition need to be monitored to assess agronomic sustainability and ecological potential of patch‐grazed pastures.  相似文献   

Pharmacokinetics of meloxicam after oral administration of a granule formulation to healthy horses     

Francisco Javier Mendoza  Juan Manuel Serrano‐Rodriguez  Alejandro Perez‐Ecija 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2019,33(2):961-967

  相似文献   

Fuzzy Decision Making in Cooperation Choosing the Objective of M&A     

LIU Xing  WANG Jia lan 《保鲜与加工》1999,(4):108-113

In order to socve the realistic problems happening in the process of M&A,the paper gives the fuzzy decision making method of cooperation choosing the best objective of M&A using the tool of fuzzy maths and applies the method to a case,which may be helpful to choose the best objective of M&A more scientifically.  相似文献   

酶的选择性纯化及酶解制备木低聚糖的研究   总被引：13，自引：4，他引：9  

洪枫  陈牧  余世袁 《林产化学与工业》1999,19(2):49-54

采用沉淀剂的Ｈ处理木聚糖酶及纤维素酶以除去大部分β－木糖苷酶,以及酶解制备木低聚糖的研究结果。研究表明,当酶液中沉淀剂Ｈ的孢和度为５０％时,处理效果最佳。  相似文献   

HPT转基因水稻对选择培养的品种间差异     

许明子  刘宪虎  具红光  严一字  吴基日 《延边大学农学学报》1999,(4)

用基因枪将ｈｐｔ 基因分别导入到不同水稻品种的愈伤组织中,为提高选择培养基的选择效果,进行了培养基和培养基中潮霉素选择浓度的筛选,结果表明ＫＳＰ 培养基的选择效果优于ＬＳ培养基,且ＫＳＰ培养基中潮霉素的选择浓度以５０ ｍｇ／Ｌ以上为宜,同时表明水稻不同品种对选择培养（ 即对潮霉素的抗性） 存在着差异．．  相似文献   

肉鸡血浆VLDL浓度的选择效应——对产蛋性能的影响     

龚道清  李辉  张德祥  杨山  王启贵  张军  王志跃  赵万里 《扬州大学学报(农业与生命科学版)》1999,(4)

以零世代和一世代高、低脂系肉鸡为素材 ,个体记录高、低脂系母鸡产蛋性能 ,屠宰测定零世代 54周龄母鸡腹脂重 (率 ) ,探讨肥度性状与产蛋性能的关系 ,并研究零世代、一世代高、低脂系产蛋性能选择效应。结果表明 :在限饲条件下 ,腹脂重 (率 )与开产日龄、产蛋量表型相关很弱。腹脂重 (率 )与蛋重呈负表型相关趋势 ;零世代高、低脂系产蛋性能差异不显著。一世代低脂系比高脂系早开产 6.7d,低脂系 4 0周龄和 54周龄产蛋量显著高于高脂系 ,表明对血浆 VLDL浓度的选择使产蛋性能产生了有益的间接反应  相似文献