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Egg freezing

Mei Li, Xiang Li, Jing Li, Mei Lu, Xuebo Liu, Xiang Duan
Multiple freeze-thaw (F-T) treatments could modify a protein structure and affect its physicochemical and biological activities. In this work, egg phosvitin (PSV) was subjected to multiple F-T treatments, and the changes in physicochemical and functional properties were investigated. The F-T treatments modified the molecular characteristics of PSV involving a decrease in surface hydrophobicity. Differential scanning calorimetry and scanning electron microscopy showed that PSV underwent denaturation, dissociation and possibly aggregation...
August 8, 2018: Food & Function
Marcia C Inhorn, Daphna Birenbaum-Carmeli, Lynn M Westphal, Joseph Doyle, Norbert Gleicher, Dror Meirow, Martha Dirnfeld, Daniel Seidman, Arik Kahane, Pasquale Patrizio
PURPOSE: What are the specific pathways that lead women to freeze their eggs? In this binational study, women were asked directly about the life circumstances that led them on the path to elective egg freezing (EEF). METHODS: From June 2014 to August 2016, 150 women (114 in the USA, 36 in Israel) who had completed at least 1 cycle of EEF were interviewed by two medical anthropologists. Study participants were recruited through four American IVF clinics (two academic, two private) and three in Israel (one academic, two private)...
August 3, 2018: Journal of Assisted Reproduction and Genetics
M C Inhorn, D Birenbaum-Carmeli, J Birger, L M Westphal, J Doyle, N Gleicher, D Meirow, M Dirnfeld, D Seidman, A Kahane, P Patrizio
BACKGROUND: What are the underlying socio-demographic factors that lead healthy women to preserve their fertility through elective egg freezing (EEF)? Many recent reviews suggest that women are intentionally postponing fertility through EEF to pursue careers and achieve reproductive autonomy. However, emerging empirical evidence suggests that women may be resorting to EEF for other reasons, primarily the lack of a partner with whom to pursue childbearing. The aim of this study is thus to understand what socio-demographic factors may underlie women's use of EEF...
July 23, 2018: Reproductive Biology and Endocrinology: RB&E
Marcia C Inhorn, Daphna Birenbaum-Carmeli, Lynn M Westphal, Joseph Doyle, Norbert Gleicher, Dror Meirow, Hila Raanani, Martha Dirnfeld, Pasquale Patrizio
Medical egg freezing (MEF) is being recommended increasingly for women at risk of losing their reproductive ability due to cancer chemotherapy or other fertility-threatening medical conditions. This first, binational, ethnographic study of women who had undergone MEF sought to explore women's experiences under two different funding systems: (i) the USA, where the cost of MEF is rarely covered by private or state health insurance; and (ii) Israel, where the cost of MEF is covered by national health insurance...
April 2018: Reproductive Biomedicine & Society Online
S Akhter, B A Rakha, M S Ansari, S Iqbal, M Khalid
Egg yolk is used as a cryoprotectant in semen preservation. However, its composition varies according to the species which may influence its effectiveness during the freeze-thaw process. Therefore, study was conducted to identify the optimum level of pigeon egg yolk (PEY) in Tris citric acid (TCA) extender for freezability and in vivo fertility of buffalo semen. Semen was collected at weekly intervals for a period of three weeks (replicates) from 6 Nili Ravi buffalo bulls (2 ejaculates/bull/replicate) and diluted with TCA extender (50 × 106 motile spermatozoa ml-1 ) containing 5%, 10%, 15% and 20% PEY or 20% CEY (control) and cryopreserved...
June 23, 2018: Theriogenology
Tran Hong Quan, Soottawat Benjakul
The effects of desugarization using glucose oxidase/catalase and spray-drying conditions on gelling properties of duck albumen powder were studied. Gelling temperatures increased as spray-drying inlet temperatures (140-180C) were increased (p < .05). ΔE*, a*-, and b*- values of gel increased but L* and whiteness decreased when higher spray-drying temperatures were used (p < .05). However, whiteness and lightness of albumen gel were drastically increased after desugarization (p < .05). Texture profile analysis showed that hardness, springiness, gumminess, and chewiness of gel decreased with increasing spray-drying temperatures...
June 13, 2018: Journal of Texture Studies
Katie E Marshall, Brent J Sinclair
Internal ice formation leads to wholesale changes in ionic, osmotic and pH homeostasis, energy metabolism, and mechanical damage, across a small range of temperatures, and is thus an abiotic stressor that acts at a distinct, physiologically-relevant, threshold. Insects that experience repeated freeze-thaw cycles over winter will cross this stressor threshold many times over their lifespan. Here we examine the effect of repeatedly crossing the freezing threshold on short-term physiological parameters (metabolic reserves and cryoprotectant concentration) as well as long-term fitness-related performance (survival and egg production) in the freeze-tolerant goldenrod gall fly Eurosta solidaginis We exposed overwintering prepupae to a series of low temperatures (-10, -15, or -20 °C) with increasing numbers of freezing events (3, 6, or 10) with differing recovery periods between events (1, 5, or 10 days)...
June 12, 2018: Journal of Experimental Biology
Karim Benhenia, Hamza Rahab, Mustapha-Adnane Smadi, Hamza Benmakhlouf, Ali Lamara, Takfarinas Idres, Mokrane Iguer-Ouada
Vitamin E is a potent molecule, especially when loaded in cyclodextrin, in modulating oxidative stress during the freeze-thawing process. The present study aimed to investigate the effect of different concentrations of cyclodextrin-vitamin E complex (CD-Vit E) on cryopreserved ram sperm. Ejaculates collected from five adult rams were pooled and divided into four aliquots. All aliquots were treated in Tris-extender (Tris-glucose-citric acid) containing 2 mg cholesterol-loaded methyl-β- cyclodextrin/120 × 106 spermatozoa and either 0 (Control), 2, 4 or 6 mg CD-Vit E/120 × 106 spermatozoa, corresponding to 0, 0...
June 6, 2018: Animal Reproduction Science
Abouzar Najafi, Ramezan Ali Taheri, Mahdieh Mehdipour, Gholamreza Farnoosh, Felipe Martínez-Pastor
Antioxidants may ameliorate the effects of the freeze-thawing stress on cryopreserved spermatozoa. Lycopene is an effective antioxidant yet to be tested for rooster sperm cryopreservation and nanoliposomes, a technology recently applied to sperm cryopreservation, could improve conservation and antioxidant delivery to spermatozoa. Therefore, we evaluated the effect of 0.1, 0.2, and 0.3 mM lycopene and lycopene-loaded nanoliposomes (LnL) on the cryopreservation of rooster sperm in Beltsville extender. Post-thawing evaluation included sperm motility, membrane integrity, abnormal morphology, mitochondria activity, apoptotic status, malondialdehyde (MDA) and antioxidant activities: Glutathione peroxidase (GPx), superoxide dismutase (SOD) and total antioxidant capacity (TAC)...
May 25, 2018: Animal Reproduction Science
Imogen Goold
In 'Egg Freezing and Egg Banking: Empowerment and Alienation in Assisted Reproduction', John A Robertson responds to the American Society of Reproductive Medicine's statement that oocyte preservation should no longer be considered an experimental treatment. He explores the implications of this development, focusing on the potentially empowering impact of oocyte preservation as a means for women to preserve their fertility. He also engages with concerns about the possibility that such a development may raise issues of alienation...
December 2017: Journal of Law and the Biosciences
Eleni A Greenwood, Lauri A Pasch, Jordan Hastie, Marcelle I Cedars, Heather G Huddleston
OBJECTIVE: To characterize the degree of decision regret following elective oocyte cryopreservation (EOC) for social indications, and identify factors associated with regret. DESIGN: Retrospective cohort survey study. SETTING: Academic center. PATIENTS: Two hundred one women who underwent EOC for fertility preservation between 2012 and 2016. INTERVENTIONS: None. MAIN OUTCOME MEASURES: Decision Regret Scale (DRS) score, from 0-100, with a cut-off >25 indicative of moderate to severe regret; and attitudes regarding decision satisfaction...
June 2018: Fertility and Sterility
R E Ellerbrock, J Honorato, B R Curcio, J L Stewart, J A T Souza, C C Love, F S Lima, I F Canisso
Urospermia is a common ejaculatory dysfunction of stallions. Current practice suggests that urine contaminated semen should not be used for cryopreservation. The aim of this study was to determine effects of urine contamination on semen freezing. Sixty-five ejaculates from eight stallions were divided into no urine (CONT), low (20% urine, LOW), and high (50% urine, HIGH) samples. Semen was extended with a commercial cooling extender, cushion-centrifuged, resuspended to 200 million/mL in a commercial egg-yolk based extender, and cryopreserved in liquid nitrogen...
September 1, 2018: Theriogenology
Gabriel Levin, Amihai Rottenstreich
No abstract text is available yet for this article.
May 23, 2018: Acta Obstetricia et Gynecologica Scandinavica
Mahdieh Mehdipour, Hossein Daghigh Kia, Gholamali Moghaddam, Hamed Hamishehkar
This experiment was conducted to study the effects of egg yolk plasma (10%, 15% and 20%), soybean lecithin (0.5%, 1% and 1.5%) and whole egg yolk (WEY) (control) on post-thawed sperm quality, hatchability and fertility outcomes. In experiment 1, sperm motility, abnormalities, membrane integrity, viability, apoptosis status, mitochondrial activity were studied following freeze-thawing. The best quality of frozen-thawed rooster sperm was chosen to be used for the assessment of the hatchability and fertility rate in experiment 2...
August 2018: Theriogenology
Monica Primacella, Tao Fei, Nuria Acevedo, Tong Wang
This study demonstrates technological advances in preventing yolk gelation during freezing and thawing. Gelation negatively affects yolk functionality in food formulation. Preventing gelation using 10% salt or sugar limits the application of the yolk. Novel food additives were tested to prevent gelation induced by freezing. Significant reduction (p < 0.05) in gel hardness of frozen-thawed yolk (45 h freezing at -20 °C) indicates that hydrolyzed carboxymethyl cellulose (HCMC), proline, and hydrolyzed egg white and yolk (HEW and HEY) are effective gelation inhibitors...
October 15, 2018: Food Chemistry
Eszter Kása, Jelena Lujić, Zoran Marinović, Tímea Kollár, Gergely Bernáth, Zoltán Bokor, Béla Urbányi, Kinga Katalin Lefler, Dušan Jesenšek, Ákos Horváth
Vitrification was applied to the sperm of two endangered fish species of Soča River basin in Slovenia, the Adriatic grayling (Thymallus thymallus) and marble trout (Salmo marmoratus) following testing different cooling devices and vitrifying media. Sperm was collected, diluted in species-specific non-activating media containing cryoprotectants, and vitrified by plunging directly into liquid nitrogen without pre-cooling. Progressive motility, curvilinear velocity, and straightness of fresh and vitrified-warmed sperm were evaluated with computer-assisted sperm analysis (CASA)...
May 19, 2018: Fish Physiology and Biochemistry
Sara E Arian, Rebecca L Flyckt, Richard Herman, Hadi Erfani, Tommaso Falcone
OBJECTIVE: To describe and demonstrate ovarian tissue cryopreservation (OTC) as an emerging fertility preservation technique DESIGN: Video presentation. SETTING: University hospital. PATIENT(S): A 6 year-old female patient diagnosed with aplastic anemia with plan for bone marrow transplantation underwent laparoscopic unilateral oophorectomy in conjunction with surgical procedure for port placement by the pediatric surgeon, followed by cryopreservation of ovarian tissue...
May 2018: Fertility and Sterility
A Khellouf, K Benhenia, S Fatami, M Iguer-Ouada
BACKGROUND: During cryopreservation sperm cells suffer from two major deleterious impacts: oxidative stress and cold shock. OBJECTIVE: To investigate in bovine species the benefit of cholesterol and vitamin E, both loaded in cyclodextrins, as a double protection against oxidative stress and cold shock. MATERIALS AND METHODS: Semen was collected from nine mature bulls using an artificial vagina and each ejaculate was split into four equal aliquots...
March 2018: Cryo Letters
Svend Lindenberg, Gitte J Almind, Frederikke B Lindenberg
PURPOSE OF REVIEW: Gonadotrophin in IVF increases the number of oocytes retrieved, and many doctors regard a high number of oocytes as a measurement of success in IVF. Thus, the dogma of more oocytes provides better IVF success has been broadly accepted. However, some European fertility specialists have argued against this concept, saying fewer eggs might, in some instances, be a better option for the patient. RECENT FINDINGS: The concept of 'one size fits all' stimulation in artificial reproductive technologies is not broadly supported by the current literature...
June 2018: Current Opinion in Obstetrics & Gynecology
S Seshadri, W Saab, H Exeter, E Drew, A Petrie, M Davies, P Serhal
OBJECTIVE: To assess the survival rate of vitrified oocytes used in an egg recipient programme and compare the clinical outcomes of pregnancy and live-birth rates per warmed oocyte with fresh autologous oocytes. The differences in the obstetrical outcomes between the two groups were also studied. DESIGN: A prospective case control study from a single in-vitro fertilisaton (IVF) Centre in UK SETTING: Centre of Reproductive and Genetic Health (CRGH), London POPULATION: Vitrified oocytes from egg donors and autologous fresh oocytes from patients attending for an IVF cycle METHODS: The study group consisted of 1490 vitrified oocytes, which were obtained from 145 egg donors who underwent a stimulation cycle at CRGH Centre...
June 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
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