نتایج جستجو برای: semen processing

تعداد نتایج: 513033  

2017
GUOJUN CHEN GEORGE F. GEE JANE M. NICOLICH JOANNA A. TAYLOR

We tested to see if semen collection interferes with fertility in naturally fertile pairs of cranes. We used 12 naturally fertile, Florida sandhill crane (Grus canadensis pratensis) pairs for this study, 6 control and 6 experimental. All pairs had previously produced fertile eggs. Semen was collected on Tuesday mornings and Friday afternoons from 26 February 1993 to 4 June 1993. We used standar...

2001
Juan C. Samper

In the last decade several registries have approved the use of frozen semen commercially. With the recent approval by AQHA, the largest horse registry in the country, to use frozen semen, it is expected that inseminating mares with frozen semen will become a common procedure. There are several advantages in using frozen semen. Among them are the following: 1) transportation of a nitrogen tank i...

Journal: :Human reproduction 2005
Elin V Magnusdottir Tanja Thorsteinsson Sigridur Thorsteinsdottir Maria Heimisdottir Kristin Olafsdottir

BACKGROUND Studies have suggested that the quality of human semen has been declining over recent decades, presumably because of lifestyle or environmental factors. METHODS Polychlorinated biphenyls and organochlorine pesticides were analysed in the plasma of 25 men with poor semen quality, 20 men with normal semen quality and idiopathic subfertility and 27 men with normal semen quality and fe...

Journal: :Cryobiology 2013
P Imrat P Suthanmapinanth K Saikhun S Mahasawangkul E Sostaric P Sombutputorn S Jansittiwate N Thongtip A Pinyopummin B Colenbrander W V Holt T A E Stout

Semen cryopreservation and artificial insemination (AI) are potentially valuable methods for supporting the breeding management of endangered species like the Asian elephant. Cryopreservation of Asian elephant semen has however proven problematic with respect to maintenance of both adequate semen quality and fertility post-thaw. In this study, nine ejaculates from three adult bulls were used to...

2012
Hsien-Ming Wu Dan-Tzu Lin-Tan Mei-Li Wang Hong-Yuan Huang Chyi-Long Lee Hsin-Shih Wang Yung-Kuei Soong Ja-Liang Lin

BACKGROUND Infertility affects approximately 10-15% of reproductive-age couples. Poor semen quality contributes to about 25% of infertile cases. Resulting from the direct effect on testicular function or hormonal alterations, heavy metals exposure has been related to impaired semen quality. The objective of this study was to assess the level of lead in the seminal plasma in men without occupati...

2012
Kampon Kaeoket

Artificial insemination (AI) is one of the first reproductive biotechnologies has been established and developed in the pig production system. In most case, liquid stored semen or fresh semen is used for AI in commercial swine herds (Wagner and Thibier, 2000). The use of FT boar semen for AI is limited due to the low fertility outcomes compared to extended fresh semen (Johnson et al., 2000; Wag...

Journal: :Human reproduction 2009
Yafei Li Hui Lin Mingfu Ma Lianbing Li Min Cai Niya Zhou Xue Han Huaqiong Bao Liping Huang Caizhong Zhu Chuanhai Li Hao Yang Zhonglin Rao Ying Xiang Zhihong Cui Lin Ao Ziyuan Zhou Hongyan Xiong Jia Cao

BACKGROUND Large studies on semen quality of the general healthy population from China are rare. METHODS A cross-sectional study was performed to evaluate the semen quality of 1346 healthy men residing in Chongqing area of southwest China in 2007. The semen parameters were measured and compared with the World Health Organization (WHO) criteria. A linear regression model was used to examine th...

2016
J. Kurykin T. Hallap M. Jalakas P. Padrik T. Kaart A. Johannisson Ü. Jaakma

The objectives were to determine the effects of insemination with sexed semen at spontaneous and induced estrus, fixed-time insemination at synchronized estrus, the deposition site, estrous intensity, housing, age, body weight, and bull on the pregnancy rate in Holstein heifers, and to compare the quality traits of sexed sperm with those of unsexed semen. The study was conducted on 3206 heifers...

2008
H. R. Seneviratne W. D. Ratnasooriya

The aim of this study was to investigate the effect of reproductive hormones in seminal plasma on the quality of the spermatozoa in men seeking infertility treatment. Of the 383 volunteers recruited, 123 had normal sperm parameters and 260 had either a single or a combination of sperm abnormalities as per WHO criteria. Follicle Stimulating Hormone (FSH), Luteinizing Hormone (LH) Prolactin (PRL)...

Journal: :Journal of immunology 2005
Prameet M Sheth Ali Danesh Kamnoosh Shahabi Anuradha Rebbapragada Colin Kovacs Rowena Dimayuga Roberta Halpenny Kelly S Macdonald Tony Mazzulli David Kelvin Mario Ostrowski Rupert Kaul

Sexual contact with HIV-infected semen is a major driving force behind the global HIV pandemic. Little is known regarding the immune correlates of virus shedding in this compartment, although HIV-1-specific CD8+ T cells are present in semen. We collected blood and semen from 27 chronically HIV-infected, therapy-naive men without common sexually transmitted infections or urethral inflammation an...

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