Annual Patterns of Human Sperm Production and Semen Quality

1984 ◽  
Vol 39 (2) ◽  
pp. 115-117
Author(s):  
D. MORTIMER ◽  
A. A. TEMPLETON ◽  
E. A. LENTON ◽  
R. A. COLEMAN
Keyword(s):  
Semen Quality ◽  
Human Sperm ◽  
Sperm Production ◽  
Annual Patterns

Annual Patterns of Human Sperm Production and Semen Quality

1983 ◽  
Vol 10 (1) ◽  
pp. 1-5 ◽  
Author(s):  
D. Mortimer ◽  
A. A. Templeton ◽  
E. A. Lenton ◽  
R. A. Coleman
Keyword(s):  
Semen Quality ◽  
Human Sperm ◽  
Sperm Production ◽  
Annual Patterns

Human sperm superoxide anion generation and correlation with semen quality in patients with male infertility

2004 ◽  
Vol 82 (4) ◽  
pp. 871-877 ◽  
Author(s):  
T SAID ◽  
A AGARWAL ◽  
R SHARMA ◽  
E MASCHA ◽  
S SIKKA ◽  
...  
Keyword(s):  
Male Infertility ◽  
Superoxide Anion ◽  
Semen Quality ◽  
Human Sperm ◽  
Superoxide Anion Generation

scholarly journals Semen quality and diversity of morphological sperm abnormalities in bulls: breed and strain effects

2019 ◽  
Vol 22 (8) ◽  
pp. 931-938
Author(s):  
M. A. Kleshchev ◽  
V. L. Petukhov ◽  
L. V. Osadchuk
Keyword(s):  
Sperm Motility ◽  
Environmental Conditions ◽  
Western Siberia ◽  
Semen Quality ◽  
Sperm Count ◽  
Sperm Concentration ◽  
Sperm Head ◽  
Sperm Dna Fragmentation ◽  
Sperm Production ◽  
Sperm Abnormalities

At present great attention is paid to studying genetic regulation of farm animal adaptations to environmental conditions. This problem is very important due to a wide expansion of highly productive cattle breeds created in Europe and North America. However, until the present no investigation of changing semen quality in bulls of imported breeds during their adaptations to environmental conditions of Western Siberia has been conducted. The aim of this study was to investigate semen quality peculiarities and the diversity of morphological sperm abnormalities in bulls of imported and local breeds kept in the environmental conditions of the southern part of Western Siberia. We determined sperm concentration, sperm count, and rate of sperm with progressive motility and percentage of morphologically normal spermatozoa. The rate of sperm abnormalities according to Blome’s classifcation was determined too. It was found that the mean values of sperm concentration, sperm motility and percentage of morphologically normal spermatozoa in the bulls investigated were similar to those in bulls kept in European countries. Inter­breed differences in these parameters were not found. However, bulls of the Red Danish, Angler, and Simmental breeds had a higher percentage of misshapen sperm head and pyriform sperm head than bulls of the Black­White breed. An inter­strain difference in sperm motility in bulls of the Black­White breed was observed. It was found that bulls of Reflection Sovereign 198998 strain had lover sperm motility than bulls of Wis Burke Ideal 1013415 strain. No inter­strain differences in sperm production, percentage of morphologically normal spermatozoa and rate of main sperm abnormalities were found. Thus, it has been found that the environmental conditions of the southern part of Western Siberia do not seriously affect the sperm production, sperm motility or percentage of morphologically normal spermatozoa in bulls. However, the increased rate of misshapen and pyriform sperm heads in the bulls of the foreign breeds points to a need to study sperm DNA fragmentation.

scholarly journals Secular variations in sperm quality: fact or science fiction?

2002 ◽  
Vol 18 (2) ◽  
pp. 403-412 ◽  
Author(s):  
Luc Multigner ◽  
Alejandro Oliva
Keyword(s):  
Science Fiction ◽  
Semen Quality ◽  
Sperm Quality ◽  
Meta Analysis ◽  
Sperm Concentration ◽  
Human Sperm ◽  
Public Health Issue ◽  
Human Populations ◽  
Homogeneous Groups ◽  
Secular Variations

The debate concerning the possible degradation in human sperm quality began in the 1970s, was revived at the beginning of the 1990s and has continued to mobilize the scientific community ever since. After the meta-analysis by Carlsen et al. (1992) showing a decline in human semen quality over the last 50 years, several groups investigated the sperm characteristics of more or less homogeneous groups of men who had provided semen at the same center for 10 to 20 years. A significant decrease in sperm concentration was reported in some studies, but not in others. Meanwhile, there is an increasing number of reports suggesting that physical and chemical factors introduced and spread by human activity in the environment may have contributed to sperm decline. At the end of the 20th century the debate on declining semen quality is not closed. The lack of certainty and the serious consequences that such a decline would have on the fertility of human populations make this an important public health issue at the start of the 21st century. For this reason, intensive research should be developed in both fundamental and epidemiological domains, particularly in South America, where industrial and agricultural pollution pose a serious threat to the population.

Effects of dietary gossypol on aspects of semen quality, sperm morphology and sperm production in young Brahman bulls

1994 ◽  
Vol 42 (1) ◽  
pp. 1-13 ◽  
Author(s):  
P.J. Chenoweth ◽  
C.A. Risco ◽  
R.E. Larsen ◽  
J. Velez ◽  
T. Tran ◽  
...  
Keyword(s):  
Sperm Morphology ◽  
Semen Quality ◽  
Sperm Production

Seasonal patterns of LH, testosterone and semen quality in the Northern pintail duck (Anas acuta)

2000 ◽  
Vol 12 (4) ◽  
pp. 229 ◽  
Author(s):  
L. M. Penfold ◽  
D. E. Wildt ◽  
T. L. Herzog ◽  
W. Lynch ◽  
L. Ware ◽  
...  
Keyword(s):  
Breeding Season ◽  
Semen Quality ◽  
Sperm Concentration ◽  
Day Length ◽  
Seasonal Patterns ◽  
Sperm Production ◽  
Normal Morphology ◽  
Northern Pintail ◽  
Sperm Trait ◽  
Percent Normal

This study characterized seasonal changes in circulating LH and testosterone and in semen production and quality in the Northern pintail duck. Plasma LH and testosterone were measured in blood samples collected weekly throughout the year from eight males exposed to natural fluctuations in day length and temperature. Semen quality was evaluated weekly in these same males from April–June, the months when spermatozoa were produced. Semen quality (based on sperm concentration and normal morphology) peaked 0–2 weeks after sperm production onset and decreased sharply before sperm production cessation in late June. Nadir LH concentrations were measured in July and August with peak LH observed in May and November. There were clear seasonal patterns in circulating testosterone with July–September values being less (P<0.05) than October–December which, in turn, were less (P<0.05) than January–March. Maximal circulating testosterone (P<0.05) occurred during April–June, coincident with semen production. Weekly circulating LH during the breeding season was directly related to testosterone concentrations (P<0.01), but was not correlated to any specific semen or sperm trait (P>0.05). Testosterone concentrations throughout the breeding season were correlated (P<0.05) to total numbers of spermatozoa produced (volume cell concentration) and percent normal sperm morphology. In summary, the Northern pintail experiences seasonal hormone fluctuations, with maximum circulating testosterone coinciding with peak ejaculate quality reflected by the production of high numbers of morphologically normal spermatozoa.

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