Results 21 to 30 of about 41,548 (168)
野生动物学报, 2007 通过对哈尔滨北方森林动物园人工饲养的白枕鹤、蓑羽鹤和灰鹤2004～2006年所产卵人工孵化的研究,结果表明:3种鹤卵前中期的孵化温度为37．6～37．8℃,相对湿度为48％～52％;孵化后期的温度为36．7～37℃,相对湿度为57％～62％;白枕鹤卵的人工孵化时间平均为30 d 2 h,平均失重率为13．41％;蓑羽鹤卵的人工孵化时间平均为27 d 15 h,平均失重率为15．06%;灰鹤卵的人工孵化时间平均为28 d 9 h,平均失重率为15．93％。
何相宝 +3 more
doaj
Conservation Biology, Volume 39, Issue 6, December 2025.Abstract Forest cover is positively associated with fish biomass and fisheries yield in the Amazon River floodplain, and many species enter flooded forests to feed, spawn, or seek refuge from predation. Floating macrophyte beds, known as floating meadows, in Amazon floodplains support high fish diversity and serve as nursery habitat for many fishes of ...
Sam Grinstead +6 more
wiley +1 more source
野生动物学报, 2013 大美洲鸵,现已被列入IUCN世界濒危动物红色名录（NT）。近年来,众多动物园饲养管理人员对大美洲鸵的饲养管理进行了深入的研究,但有关大美洲鸵人工孵化技术的研究尚属于空白阶段。本研究基于1998年至今的孵化经验和实践操作,着重从大美洲鸵卵的处理、孵化前准备及孵化技术3个方面内容进行探讨。研究显示:1)种卵的新鲜度、形状、大小、重量、卵壳厚度、消毒过程等因素对孵化成功率有直接影响;2)待孵的大美洲鸵的种卵,贮存温度控制在1520℃间,相对湿度约70%75%,入孵时必须对种卵进行6 h左右的预热处理;3 ...
杨天春, 黄康宁
doaj
World Medical &Health Policy, Volume 17, Issue 3, Page 580-588, September 2025.ABSTRACT Women's reproductive rights in China are shaped by geopolitical and cultural factors, resulting in restricted access to planned oocyte cryopreservation (planned OC). While the global discourse surrounding planned OC continues to evolve, China currently sanctions egg freezing for medical purposes exclusively in married women, while prohibiting ...
Olivia M. Y. Ngan +2 more
wiley +1 more source
赤麻鸭(Tadorna ferruginea)的人工孵化初探
野生动物学报, 2014 2011年4～5月,对徐州金桥禽业发展有限公司养殖的赤麻鸭所产的44枚卵进行了人工孵化研究。其中43枚卵受精,出雏35枚,4枚在孵化中期死胚,5枚为27 d落盘后啄壳困难而死亡,受精卵的孵化率为81.40%。孵化温度前期为38.5℃; 中期为38.2℃; 后期为37.8℃,落盘后温度降为37.5℃。赤麻鸭卵鲜重为(79.80±6.72)g,长径为(66.10±2.53)mm,短径为(46.40±1.45)mm,卵形指数为1.43±0.06,出雏后的卵壳等剩余物质重(12.60±1.07)g ...
李莎莎 田秀华 陈雁飞 巩万里
doaj
Fluctuating salinity during development impacts fish life histories
Journal of Animal Ecology, Volume 94, Issue 9, Page 1848-1865, September 2025.Global freshwater ecosystems are increasingly threatened by salinisation. Salinity levels not only rise but also fluctuate due to extreme climate events and human activities. This study shows that stable elevated salinity accelerates reproduction in a freshwater fish, but fluctuations in salinity reduce reproductive output, with sex‐specific effects on
Meng‐Han Joseph Chung +4 more
wiley +1 more source
New Phytologist, Volume 247, Issue 6, Page 2678-2696, September 2025.Summary Many plants reproduce asexually by generating clonal progeny from vegetative tissues, a process known as vegetative reproduction. This reproduction mode contrasts with sexual reproduction, which enhances genetic diversity. The bryophyte Marchantia polymorpha L.
Yuuki Sakai +6 more
wiley +1 more source
Ecology and Evolution, Volume 15, Issue 7, July 2025.Using a large dataset of nest photographs from open‐source platforms, we investigated defecation and fright moulting in incubating Eurasian woodcocks (Scolopax rusticola), finding defecation in 54% of nests and feathers in 67%. We suggest these behaviours may aid the female's escape rather than protect the nest, and highlight the importance of ...
Martin Sládeček +3 more
wiley +1 more source
卵泡液中神经营养因子4及卵丘细胞TrkB受体与卵子发育潜能的关系
Zhongshan Daxue xuebao. Yixue kexue ban, 2021 目的探索人卵泡液中神经营养因子4（NT-4）及卵丘颗粒细胞中TrkB受体的表达与卵子发育潜能的关系。方法收集2020年5月至2020年11月在中山大学附属第六医院生殖中心，因男方因素行卵胞浆内单精子注射（ICSI）治疗的63例患者的卵泡液和卵丘颗粒细胞，用ELISA检测卵泡液中NT-4水平，实时荧光定量PCR检测卵丘颗粒细胞中TrkB受体两种不同亚型TrkB-fl和TrkB-t1的表达水平，分析与卵子成熟、受精和胚胎发育的关系。结果卵泡液中NT-4水平与正常受精数（rs=0.250， P=0.048 ...
周怡 +5 more
doaj
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 1, Page 89-95, July 2025.ABSTRACT Objective To assess the effect of interpregnancy interval on the odds of recurrence of tubal ectopic pregnancy (TEP) following expectant or surgical management. Methods This was a retrospective cohort study conducted at a tertiary early pregnancy unit (EPU) in London, UK.
W. M. Dooley +6 more
wiley +1 more source