Search Results
Results 401 - 450 of 1002
< 4 5 6 7 8 9 10 11 12 13 14 >
Hudson Benton P - - 2002
In order to assess the effects of subgroup J avian leukosis virus (ALV-J) on semen quality, broiler breeder males were separated by ALV-J status (ALV-J positive = POS, ALV-J negative = NEG) at 44 wk of age. Of the 249 males originally placed at 1 day of age, 101 (40.6%) ...
Rolf C - - 2002
In a cross-sectional retrospective study, the age-dependency of semen parameters of men with specific andrological diseases was investigated in 3,698 men (mean age 33 years; range 19-63 years) attending a tertiary referral clinic for couple infertility. In all, 1,853 patients suffered from idiopathic infertility (mean age 33.2 years; range 19-60 ...
Flores P - - 2002
Increasing the knowledge of the semen characteristics in the alpaca will contribute to understanding one of the many factors that affect the poor fertility rate in this species. Ten adult male alpacas, 2.6-10 years of age, average weight 64.7 +/- 4.7 kg were used. The animals were distributed randomly into ...
Dallinga Jan W - - 2002
BACKGROUND: Various studies have been performed in which potential effects of xenoestrogens on fertility or sperm parameters were investigated by comparing groups of subjects exposed to different levels of these chemicals. METHODS: In our study we used an alternative approach, as we selected one group of men with very poor ...
Tielemans Erik - - 2002
An assumption in case-control studies is that forces of selection are the same for cases and controls. This may not be true for studies of male infertility among infertility clients. Earlier reproductive outcomes may introduce modification of risk behavior or differential referral. Selection bias might also occur when infertile males ...
Repping Sjoerd - - 2002
OBJECTIVE: To evaluate the capacity of baseline characteristics and total motile sperm count (TMC) to predict total fertilization failure (TFF) in patients undergoing IVF. DESIGN: Retrospective cohort study. SETTING: University hospital. PATIENT(S): Eight hundred ninety-two couples with a total of 1,569 consecutive IVF cycles. INTERVENTION(S): Prewash and postwash TMC during ...
Chandola T - - 2002
The paper seeks to identify common features in the fertility patterns of the English-speaking world and provide a model basis for comparison of fertility between countries and over time. Attention is focused on the heterogeneity within the fertility patterns of Australia, Canada, New Zealand, and the United States, similar to ...
Weerasinghe Daminda P - - 2002
This study examines the effect of household wealth on marital fertility in Sri Lanka. Data on type of dwelling, availability of vehicles, and electrical equipment in households were combined with estimates of 'typical' rupee values of various elements to generate an index of their wealth. Differentials in value of the ...
Dunson David B - - 2002
BACKGROUND: Most analyses of age-related changes in fertility cannot separate effects due to reduced frequency of sexual intercourse from effects directly related to ageing. Information on intercourse collected daily through each menstrual cycle provides the data for estimating day-specific probabilities of pregnancy for specific days relative to ovulation, and these ...
Nicholls Henry - - 2002
Evidence is accumulating that in many species, males deliver more sperm to some females and fewer to others depending on how valuable they perceive the copulation. Do humans have any control over the number of sperm they ejaculate?
Shapiro Bruce S BS Fertility Center of Las Vegas, Las Vegas, Nevada 89117, USA. - - 2002
To examine the effects of patient age on the growth and transfer of blastocyst-stage embryos. Retrospective clinical study. Private assisted reproductive technologies center. Three hundred patients between the ages of 18 and 45 undergoing in vitro fertilization. Bipronucleate oocytes were grown for up to 144 hours and subsequently transferred when ...
Jung A - - 2002
The effects of age on semen quality were analysed in patients referred to an andrology outpatient clinic in a retrospective study covering a period of 3 years. Semen analyses of older men (n = 66; > or = 50 years; median: 53) were compared with those of young patients (n ...
Picard-Hagen N - - 2002
Semen production units compete heavily with each other, so they tend to select and collect bulls at the earliest possible age, even before puberty, in order to reduce the interval between generations. This study is a retrospective analysis of the effect of precocious collection on semen quality in Holstein bulls. ...
Bittles A H - - 2002
In most Western countries there is a widespread belief, fostered in part by historical prejudice and religious proscription, that inbreeding in human populations causes a reduction in fertility. Support for this belief has been claimed in HLA-based studies, with increased rates of fetal losses suggested in HLA-compatible unions. To critically ...
Abdelmassih Vicente - - 2002
BACKGROUND: It is not well defined whether the elapsed time after vasectomy has any influence on the outcome of IVF-ICSI using epididymal sperm. We analysed retrospectively the results of 151 ICSI cycles in which sperm of vasectomized men were used at different time periods after vasectomy. METHODS: Oocytes were obtained ...
Bernasconi G - - 2002
While sperm competition risk favours males transferring many sperm to secure fertilizations, females of a variety of species actively reduce sperm numbers reaching their reproductive tract, e.g. by extrusion or killing. Potential benefits of spermicide to females include nutritional gains, influence over sperm storage and paternity, and the elimination of ...
Parker H M - - 2002
If semen quality was known prior to insemination, sperm doses could possibly be decreased, maximizing the number of hens inseminated. The sperm quality index (SQI), an indicator of overall semen quality, is determined by the number of deflections in a light path due to sperm movement inside a capillary tube. ...
Kang K.-S. - - 2002
The correlation between 99 clone female and male fertilities in a first generation seed orchard of Pinus densiflora was studied over 6 years. The effective number of the parent ( N(p)) and the variance effective population number [ N(e)((v))] were used to assess the impact of total (Psi(T)), female (psi(f)) ...
Rajpert-De Meyts Ewa - - 2002
Several reports implicated a relation between the trinucleotide (CAG) repeat length in the androgen-receptor gene and male infertility, whereas others failed to find an association. We investigated the CAG repeat length in relation to sperm production and reproductive hormones in 119 infertile men and 110 men with proven fertility. We ...
McGary S - - 2002
Genetic selection procedures applied to improve broiler performance may negatively impact the subsequent reproductive efficiency of breeders, particularly in males. Identification of traits that reliably indicate individual male fertility would facilitate selection for reproduction. We hypothesized that physical traits, such as comb area, relative testicular weight, and testicular weight asymmetry, ...
Trabulsi Edouard J - - 2002
OBJECTIVES: To determine the level of leukocytospermia and seminal leukocyte subtypes in men with spinal cord injury (SCI) and to compare the findings with those of fertile, able-bodied controls. DESIGN: Prospective, controlled clinical trial. SETTING: University infertility practice. PARTICIPANTS: Thirteen able-bodied fertile men age matched to 17 men with SCI ...
Atkins D C - - 2001
Infidelity is a common phenomenon in marriages but is poorly understood. The current study examined variables related to extramarital sex using data from the 1991-1996 General Social Surveys. Predictor variables were entered into a logistic regression with presence of extramarital sex as the dependent variable. Results demonstrated that divorce, education, ...
Barbieri R L - - 2001
Obstetrician-gynecologists are frequently consulted by couples who are concerned about their fertility potential. During the initial fertility consultation, questions may arise concerning the potential impact of lifestyle choices on fertility. For the female partner, common exposures associated with a decrease in fertility are cigarette smoking, alcohol consumption of >4 drinks ...
Lowe X - - 2001
With increasing availability of drugs for impotence and advanced reproductive technologies for the treatment of subfertility, more men are fathering children at advanced ages. We conducted a study of the chromosomal content of sperm of healthy men aged 24-57 years to (a) determine whether father's age was associated with increasing ...
Hess M F - - 2001
The purposes of this study were to establish the basal plasma and testicular insulin-like growth factor-I (IGF-I) values for stallions ranging in age from 6 months to 23 years and to determine if IGF-I could be used as a marker for declining fertility. Blood and testes were obtained from 28 ...
Paschos I - - 2001
Chromosome engineering was used to develop lines that expressed the stable phenotypic characteristics of goldfish, Carassius auratus (var. oranda). To obtain androgenetic individuals, carp eggs were irradiated and fertilized with sperm from goldfish bearing telescopic eyes. The fertilized eggs were divided into four groups and three of them were subjected ...
Lee P A - - 2001
PURPOSE: We determined whether testicular size at orchiopexy is predictive of fertility potential and whether size correlates with sperm parameters, hormone levels or testicular volume in adulthood. MATERIALS AND METHODS: Testicular size obtained from the operative notes of patients who underwent unilateral orchiopexy was classified as normal, small or large ...
Wilkinson G S - - 2001
The cytological basis of X chromosome meiotic drive or sex ratio (SR) has been reported for several species of Drosophila but not for other species. Here we describe how sperm development in the stalk-eyed fly, Cyrtodiopsis whitei, influences progeny sex proportion, in order to determine if a common developmental mechanism ...
Morel F - - 2001
The aim of this study was to determine whether sperm morphology and nuclear maturity are associated with an increase in the prevalence of disomy in human spermatozoa. Semen samples were obtained from 60 patients selected at random from a population of men undergoing semen analysis as part of consultation for ...
Wang J - - 2001
OBJECTIVE: Prostasome-like granules are present in the PC-3 prostate cancer cells. Since the seminal prostasomes are able to promote the forward motility of human spermatozoa, we conducted a study to determine whether PC-3 prostasomes exerted effects similar to those of seminal prostasomes on buffer-washed spermatozoa from normospermic semen samples. STUDY ...
Moreland R B - - 2001
Limited reproductive data are available for any species of howler monkey, including those listed as threatened (Alouatta pigra) and endangered (A. palliata) by the Convention on International Trade in Endangered Species Status (CITES) report. The Southern black howler monkey (A. caraya) is being considered as a model species to develop ...
Burmeister L - - 2001
In-vitro fertilization (IVF) has made great strides in the past 25 years including the development of micromanipulation techniques. Intracytoplasmic sperm injection (ICSI) for treatment of severe male factor infertility paved the way for the use of the micromanipulator. Micromanipulation techniques are now an integral part of an IVF program and ...
van den Akker O B A - - 2001
The choice of adoption over genetic parenthood was investigated in 105 women retrospectively by questionnaire. Participants were divided into four groups: female/male subfertility; female subfertility; male subfertility; and female/male fertility. Half the sample (59/105) answered the question about the importance of a genetic link. Women who failed to adopt thought ...
Petersen C G - - 2001
PURPOSE: The objective of this study was to assess first embryo cleavage (FEC) 25-27 h after intracytoplasmic sperm injection (ICSI) as a parameter for the embryo selection process. METHODS: From January 1998 to December 1999, a total of 670 patients were subjected to the ICSI programme at the Centre for ...
Paulson R J - - 2001
OBJECTIVE: This study was undertaken to determine the effect of male aging on sperm quality as determined by semen analysis, the fertilization rate of human oocytes in vitro, and live birth rates. STUDY DESIGN: Retrospective analysis correlating outcome measures with male age was performed for 558 oocyte donation cycles in ...
Sitko D - - 2001
Microsurgical re-anastomosis or IVF offer ways of reversing previous tubal sterilization. This retrospective study analysed 56 attempts of IVF in 37 couples after impossible or failed surgical sterilization reversal. Efficacy of IVF in this group (TL) was compared with that of a tubal pathology control group (TP) at all stages ...
Biondi G - - 2001
Data on grandparental surnames were obtained from school-children in 22 communes from Campobasso Province, Italy (Molise Region). The distribution of surnames was shown to be almost exactly linear by a log2-log2 transformation, which justified the fitting of the data to Fisher's logarithmic distribution. The values for v were higher among ...
Molina J - - 2001
The aim of this study was to evaluate the chromatin status in different groups of patients. Five groups of men were selected: pre-vasectomy; male factor infertility; varicocele; immunological male infertility; and idiopathic infertility. Chromatin status was evaluated using flow cytometry after staining the DNA with the fluorochrome propidium iodide. Differences ...
Syntin P - - 2001
The Brown Norway rat provides a useful model to study aging of the male reproductive tract because of the selective age-dependent pathological changes that are found in the testis, epididymis, and prostate. In the testis, there is a clear age-dependent decrease in both steroidogenesis and spermatogenesis. In the epididymis, some ...
Kidd S A - - 2001
OBJECTIVE: To review the literature on the association between male age and semen quality (semen volume, concentration, motility, and morphology) and fertility status (pregnancy rate and time to pregnancy/subfecundity). METHOD(S): Review of English language-published research over the last 20 years from January 1, 1980, through December 31, 1999, using MEDLINE ...
Gunalp S - - 2001
The aim of the study was to determine the semen parameters of a proven fertile population and to compare these parameters with that of a subfertile group in the same region. Sixty-nine fertile male patients were studied and compared with 93 patients recruited at an infertility clinic. A sub-sample of ...
Gauthier M - - 2001
Three, genetically identical, Nigerian Dwarf bucks produced by somatic cell nuclear transfer (NT) of fetal fibroblasts were monitored for sexual maturation and fertility. Starting at four months of age, these male clones were trained to serve an artificial vagina (AV). Average age of the NT-derived bucks at first semen collection ...
Weissenberg R - - 2001
Recent developments in infertility treatment, as well as medical and ethical concern to preserve the fertilizing ability of male subjects potentially at risk, led to the inception of a sperm cryobank in our medical center in 1996. Up to the end of the year 2000, 64 young men displaying higher ...
Miller K D - - 2001
To further evaluate whether fertility is decreased among a cohort of men with previous unilateral cryptorchidism as compared with a control group of men. Formerly unilateral cryptorchid men who had undergone orchiopexy between the years of 1955 and 1975 at the Children's Hospital of Pittsburgh and a control group of ...
Nawroth F - - 2001
Zona pellucida (Z.p.) thickness is believed to be considerably influenced by hormonal stimulation. Assessments of the influence of the patient's age on Z.p. thickness have been at variance. In our study we wanted to investigate, among several other parameters, the age of the patient as a possible factor influencing Z.p. ...
Rolf C - - 2001
The changes of reproductive functions, fertility and genetic risks of ageing females have been investigated relatively intensively. The state of knowledge about endocrine and reproductive changes in ageing men as well as possible age-related paternal genetic risks lags far behind. In general serum testosterone levels decrease with increasing age. In ...
Wilkerson M L - - 2001
We compared a group of intra-abdominal (IA) with intracanalicular (IC) testes of the same age in order to see if there were differences in the fertility potential of the testes in these two locations. We also wished to determine at what age, if any, differences became apparent. Semithin (1 microm ...
Ledur M C - - 2000
1. Fertility and hatchability of 3 White Leghorn strains and their 2-way crosses were examined in the 1st laying cycle to evaluate the effects of ageing on mean heterosis, reciprocal effects, additive (A), Z-chromosomne (Z) and heterotic effects (H), as well as on their variances. 2. Fertility and hatchability were ...
Nishimura S - - 2000
In male Tokara (Japanese native) goats, testis development and the onset of puberty were studied histologically and observing sexual behaviour. Testes weight increased from 36+/-5.4 (S.E.) g (n=5) at 3 months of age to 126+/-6.3 g (n=6) at 12 months. The degree of the testis development differed among kids at ...
Brockmann HJ - - 2000
Unpaired or satellite male horseshoe crabs, Limulus polyphemus, are attracted to and often form a group around a pair (a female with an attached male) that is nesting in the high intertidal zone. These males are engaged in sperm competition. We observed nesting pairs and their associated satellites in the ...
< 4 5 6 7 8 9 10 11 12 13 14 >