Rats ejaculate prematurely and increase the sperm output during competitive mating

2020 ◽  
Vol 32 (4) ◽  
pp. 351-360
Author(s):  
Maria R. Fuentes-Morales ◽  
Gabriel Gutiérrez-Ospina ◽  
Alonso Fernández-Guasti ◽  
Yolanda Cruz ◽  
Rosa Angélica Lucio
Keyword(s):  
Sperm Output

scholarly journals THE EFFECT OF HEMICASTRATION ON DAILY SPERM OUTPUT IN THE RAT AS MEASURED BY A NEW METHOD

Reproduction ◽  
1974 ◽  
Vol 41 (2) ◽  
pp. 355-359 ◽  
Author(s):  
J. T. M. VREEBURG ◽  
M. V. van ANDEL ◽  
W. J. KORT ◽  
D. L. WESTBROEK
Keyword(s):  
New Method ◽  
Sperm Output

scholarly journals trans-Resveratrol, a Natural Antioxidant from Grapes, Increases Sperm Output in Healthy Rats

2005 ◽  
Vol 135 (4) ◽  
pp. 757-760 ◽  
Author(s):  
M. Emília Juan ◽  
Eulalia González-Pons ◽  
Thais Munuera ◽  
Joan Ballester ◽  
Joan E. Rodríguez-Gil ◽  
...  
Keyword(s):  
Natural Antioxidant ◽  
Sperm Output

A Bayesian approach to prediction of stallion daily sperm output

2004 ◽  
Vol 62 (9) ◽  
pp. 1607-1617 ◽  
Author(s):  
James A. Thompson ◽  
Charley C. Love ◽  
Kelly L. Stich ◽  
Steven P. Brinsko ◽  
Terry L. Blanchard ◽  
...  
Keyword(s):  
Bayesian Approach ◽  
Sperm Output

Modification of spermatozoa quality in mature small ruminants

2012 ◽  
Vol 24 (1) ◽  
pp. 13 ◽  
Author(s):  
G. B. Martin ◽  
T. Jorre de St Jorre ◽  
F. A. Al Mohsen ◽  
I. A. Malecki
Keyword(s):  
Large Body ◽  
Small Ruminants ◽  
Cell Loss ◽  
Testicular Tissue ◽  
The Other ◽  
Sperm Production ◽  
Testicular Mass ◽  
Other Hand ◽  
Sperm Survival ◽  
Sperm Output

This review is based largely, but not entirely, on the assumption that gamete quality is directly linked to sperm output and thus testicular mass, an approach made necessary by the absence of a large body of data on factors that affect gamete quality in ruminants. On the other hand, there is a change in the efficiency of sperm production per gram of testicular tissue when the testis is growing or shrinking, a clear indicator of changes in the rates of cell loss during the process of spermatogenesis, probably through apoptosis. We therefore postulate that the spermatozoa that do survive when the testis is shrinking are of a lower quality than those that are produced when the testis is growing and the rate of sperm survival is increasing. In adult small ruminants in particular, testicular mass and sperm production are highly labile and can be manipulated by management of photoperiod (melatonin), nutrition, genetics and behaviour (‘mating pressure’). Importantly, these factors do not act independently of each other – rather, the outcomes in terms of sperm production are dictated by interactions. It therefore seems likely that spermatozoa quality will be affected by these same factors, but definitive answers await detailed studies.

Factors affecting the response of working boars to changing environmental temperature

1991 ◽  
Vol 1991 ◽  
pp. 140-140
Author(s):  
Angela H Cliff ◽  
J H Dunne ◽  
P R English ◽  
J S M Hutchinson ◽  
O Macpherson
Keyword(s):  
Heat Stress ◽  
Adverse Effects ◽  
Environmental Temperature ◽  
Semen Quality ◽  
Sperm Quality ◽  
Sperm Concentration ◽  
Factors Affecting ◽  
High Environmental Temperature ◽  
Sudden Rise ◽  
Sperm Output

It is well established that high environmental temperature can have adverse effects on sperm concentration and the normality of sperm in the boar. Induced abnormalities include reduced motility, abnormal heads, proximal droplets, coiled and bent tails and abnormal acrosomes (Malmgren and Larsson, 1989). While all stages of spermatogenesis can be adversely affected, the primary spermatocytes are most vulnerable to these influences. Since spermatogenesis occurs over 45 days, any adverse effects of elevated ambient temperature can affect sperm quality for around 6 weeks. The maximum period of infertility appears around weeks 3 and 4 after heat stress. Reduced levels of testosterone and sometimes of LH following heat stress are implicated in these adverse effects. There is evidence that boars subjected to high constant temperature (30°C), which have become acclimatised to such, are affected less in terms of sperm output and quality (Cameron and Blackshaw, 1980) than when boars are subject to sudden major increases in temperature from fairly low levels (15 to 30 C) e.g. during the summer months (Antonyuk et al, 1983). There also appears to be large differences between boars in their ability to adapt to exposure to high environmental temperature by minimising temperature rise and avoiding adverse effects on semen quality (Cameron and Blackshaw, 1980). These workers found that boars prone to heat stress show an acute rise in body temperature in response to elevated environmental temperature and this sudden rise has a more adverse effect on semen quality than the length of exposure to the elevated temperature. There appears to be little information available on the reasons for such important between boar differences. This study was carried out to determine rectal temperature responses of boars to varying summer temperature in an intensive pig enterprise in Scotland and to attempt to determine some of the factors associated with ‘high’ and ‘low’ responding boars.

scholarly journals Biometric testicular and serum testosterone concentration of Brazilian Ponies stallions

2017 ◽  
Vol 18 (1) ◽  
pp. 204-210
Author(s):  
Miguel Alejandro Silva RUA ◽  
Celia Raquel QUIRINO ◽  
Wilder Hernando Ortiz VEJA ◽  
Aylton BARTHOLAZZI JUNIOR ◽  
Rosemary BASTOS ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Rio De Janeiro ◽  
Reproductive Potential ◽  
Serum Testosterone ◽  
Testicular Volume ◽  
Testis Size ◽  
Testosterone Concentration ◽  
Important Trait ◽  
Sperm Output ◽  
Janeiro State

SUMMARY Evaluation of the testis size is very important in stallions’ selection, since it is an indirect determinant of their reproductive potential. The aim of this study was to evaluate the biometric testicular traits, calculate the volume testicular and analyze the serum testosterone concentration of the stallion. During six months were measured the tests of adults Brazilian Ponies stallions from northern of Rio de Janeiro State, Brazil. The length, the width and the height of the testicles (TL, TW and TH) were measured. From these measurements, the total testicular volume (TTV) was calculated. The serum testosterone concentration was also evaluated. The data were studied by analysis of variance and were calculated the correlations among the traits. The average of the testis biometry were TL 5.8 ± 0.6 cm; TW 3.8 ± 0.5 cm; TH 4.7 ± 0.4 cm and 111.2 ± 27.7 for TTV. Mean of serum testosterone concentration was 0.89 ± 0.52 ng/dl. High correlations between biometry testicular traits with testicular volume were observed and low to moderate correlations were observed for testicular traits, testosterone and sperm output. The testis size could be an important trait that assists to the prediction of stallion's reproductive potential of the Brazilian ponies stallions. It is suggested that there would be no fluctuation in serum testosterone concentration in Brazilian ponies stallions that coult afect on its fertility.

251. Production of donor-derived live lambs following testis germ cell transplantation

2008 ◽  
Vol 20 (9) ◽  
pp. 51
Author(s):  
M. Herrid ◽  
M. Jackson ◽  
N. Suchowerska ◽  
S. Stockwell ◽  
K. Hutton ◽  
...  
Keyword(s):  
Germ Cell ◽  
Cell Transplantation ◽  
Single Cells ◽  
Pubertal Stage ◽  
No Donor ◽  
Post Irradiation ◽  
Germ Cell Transplantation ◽  
Donor Cells ◽  
The Right ◽  
Sperm Output

Testes germ cell transplantation in livestock has the potential for amplification of transgenic genotypes and for use as an alternative to artificial insemination. This study investigated a workable protocol for testis germ cell transplantation in sheep between animals of the same breed and different breeds. Testes of two groups of recipients at the stage of pre-pubertal (transition from gonocytes to spermatogonia, n = 2) or peri-pubertal (spermatogenesis initiated, n = 2) were treated with a single dose of 9 grey (Gy) or 15 Gy with a 6MV photon beam irradiation, respectively. In the first experiment, using pre-pubertal irradiated animals, testis germ cell transplantation between the same breed was performed at 16 weeks post irradiation. The left testes of recipient rams were injected with donor cells labelled with fluorescent dye PHK26, while the right testes were given unlabelled cells. The left testes of recipients were removed by castration after 2 weeks following transplantation to evaluate the location of the transferred cells, while the right testes were kept in place for long-term assessment of sperm output. In cryosections of the left testes, PKH26 positive cells were found both on the basement membrane as single cells or in the interstitial area. In the second experiment, animals irradiated at the peri-pubertal stage, received donor cells at 5 weeks post irradiation and animals were kept intact for semen production. For a period of two years after transplantation, semen samples were collected routinely from two groups of rams and analysed using microsatellite markers. Two recipients (50%) demonstrated the presence of donor DNA in their ejaculates. In order to investigate the fertility of the donor-origin sperm in recipient ejaculates, 99 ewes were artificially inseminated with semen from two positive rams. Four lambs (8%) have been identified as being sired by donor-derived sperm produced in the recipient ram that received a Merino to Merino transplantation, while no donor-derived offspring was obtained from the recipient with Border Leicester to Merino transplantation. This study represents the first report of the production of live progeny following testis germ cell transplantation in sheep.

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