|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Current strategies for reproductive management of gilts and sows in North America显示文摘Many advances in genetic selection, nutrition, housing and disease control have been incorporated into modern pork production since the 1950 s resulting in highly prolific females and practices and technologies, which significantly increased efficiency of reproduction in the breeding herd. The objective of this manuscript is to review the literature and current industry practices employed for reproductive management. In particular the authors focus on assisted reproduction technologies and their application for enhanced productivity. Modern maternal line genotypes have lower appetites and exceptional lean growth potential compared to females of 20 yr ago. Thus,nutrient requirements and management techniques and technologies, which affect gilt development and sow longevity, require continuous updating. Failure to detect estrus accurately has the greatest impact on farrowing rate and litter size. Yet, even accurate estrus detection will not compensate for the variability in the interval between onset of estrus and actual time of ovulation. However, administration of Gn RH analogs in weaned sows and in gilts after withdrawal of altrenogest do overcome this variability and thereby synchronize ovulation, which makes fixed-time AI practical. Seasonal infertility, mediated by temperature and photoperiod, is a persistent problem. Training workers in the art of stockmanship is of increasing importance as consumers become more interested in humane animal care.Altrenogest, is used to synchronize the estrous cycle of gilts, to prolong gestation for 2–3 d to synchronize farrowing and to postpone post-weaning estrus. P.G. 600? is used for induction of estrus in pre-pubertal gilts and as a treatment to overcome seasonal anestrous. Sperm cell numbers/dose of semen is significantly less for post cervical AI than for cervical AI. Real-time ultrasonography is used to determine pregnancy during wk 3–5. PGF2αeffectively induces farrowing when administered within two d of normal gestation length. Ovulation synchronization, single fixed-time AI and induced parturition may lead to farrowing synchronization, which facilitates supervision and reduces stillbirths and piglet mortality. Attendance and assistance at farrowing is important especially to ensure adequate colostrum consumption by piglets immediately after birth. New performance terminologies are presented. | Robert R Kraeling Stephen K Webel | 2015 | Journal of Animal Science and Biotechnology2015，6，2： | 27 |
| 2 | Chaos in German stock returns New evidence from the 0-1 test显示文摘 | WEBEL K | 2012 | Econ Lett2012，115，： | 1 |
| 3 | In utero and postnatal exposure to long chain (n-3) PUFA enhances intestinal glucose absorption and energy stores in weanling pigs显示文摘 | Gabler N K Spencer J D Webel D M | 2007 | Journal of Nutrition2007，137，： | 1 |
| 4 | Omega- 3 fatty acids in the gravid pig uterus as affected by maternal supplementation with omega-3 fatty acids 显示文摘 | Brazle A E Johnson B J Webel S K | 2009 | Journal of Animal Science2009，87，： | 1 |
| 5 | In utero and postnatal exposure to long chain (n-3) PUFA enhances intestinal glucose absorption and ener- gy stores in weanling pigs 显示文摘 | GABLER N K SPENCER J D WEBEL D M | 2007 | The Journal of Nutri- tion2007，137，11： | 1 |
| 6 | Focus on increasing treat- ment self-efficacy to improve human immunodeficiency virus treat- ment adherence显示文摘 | Nokes K Johnson MO Webel A | 2012 | J Nurs Scholarsh2012，44，4： | 1 |
| 7 | Omega-3 fatty acids in the gravid pig uterus as affected by maternal supplementation with omega-3 fatty acids显示文摘 | Brazle A E Johnson B J Webel S K | | 0，，： | 1 |
| 8 | 经产母猪管理显示文摘本文是《北美后备母猪和经产母猪繁殖管理的最新策略》的第二部分,主要介绍经产母猪管理的相关内容,包括经产母猪的营养,猪舍和环境,查情和配种,产房管理、监控和诱产,季节性不孕. | 李洪宇(译) 陈建康(校) robert r kraeling stephen k webel | 2018 | 国外畜牧学(猪与禽)2018，38，9： | 1 |
| 9 | Omega-3 fatty acids in the gravid pig uterus as affected by maternal supplementation with omega-3 fatty acids显示文摘 | BRAZLE A E JOHNSON B J WEBEL S K | 2009 | Journal of Animal Science2009，87，3： | 1 |
| 10 | 后备母猪培育和管理显示文摘自20世纪50年代起,基因选择、营养、饲养设施和疾病控制等诸多研究进展已经被应用到现代猪肉生产中,从而产生了高产母猪和相关的管理措施与技术。本文的目的是综述应用于繁殖管理方面的文献和最新的行业生产技术,尤其是重点评述辅助繁殖技术及其在提高母猪生产力上的应用情况。与20年前的母猪相比,现代母系猪种食欲较低,但瘦肉的生长潜力较高。因此,会影响后备母猪发育和使用年限的营养需求、管理技术和生产工艺需要持续的更新。不能准确地确定母猪的发情会严重影响母猪的分娩率和窝产仔数。然而,即使能够准确地确定母猪发情也不能消除由发情开始至实际排卵之间的时间间隔差异所造成的影响。然而,在停用烯丙孕素之后,给断奶母猪和后备母猪服用促性腺激素释放激素类似物,能克服这种差异,因此能够引发母猪同步排卵,这使养猪场能够对繁育母猪定期进行人工授精。受温度和光周期调控影响的季节性不孕是养猪生产中一个持续存在的问题。随着消费者对动物福利越来越重视,对养殖场员工进行技能培训显得越来越重要。用于后备母猪同步发情的烯丙孕素可以使母猪的妊娠期延长2 d~3 d,以使群内母猪能够同步分娩和推迟断奶后的发情。P.G.600可以用来诱导初情期前的后备母猪发情,并可治疗季节性乏情。与子宫颈授精相比,子宫内授精(即深部输精)对每份精液或每次授精所需的精子数明显减少。在人工授精后3~5周,实时超声检查可以查明母猪是否妊娠。在正常的预产期前2 d,前列腺素F2α能有效诱导母猪分娩。同步排卵、单次定期人工授精和诱导生产可使母猪同步分娩,这有助于养猪场进行生产管理,并可减少死胎,降低仔猪死亡率。人工接产和助产对确保仔猪在出生后能够及时吃到充足数量的初乳是非常重要的。本综述还提出了新的性能术语。 | 李洪宇(译) 陈建康(校) 靳文广(制图) robert r kraeling stephen k webel | 2018 | 国外畜牧学(猪与禽)2018，38，9： | 0 |
| 11 | 饲养环境、新型管理技术显示文摘本文是《北美后备母猪和经产母猪繁殖管理的最新策略》的第三部分,主要介绍母猪饲养环境、新技能术语和当前新型管理技术使用策略等内容. | 李洪宇(译) 陈建康(校) robert r kraeling stephen k webel | 2018 | 国外畜牧学(猪与禽)2018，38，9： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员