Data in the literature regarding percentages of contaminated ejaculates
are limited (9.
A group of researchers at Dalhousie University conducted a study of the chemical composition of female ejaculate
fluid back in 1984.
Changes in seminal par ameters of ejaculates
after repeated ejaculation.
The data presented show that the incidence of morphologically well-formed spermatozoa in the semen of boars regarded as providers of highly sensitive semen (group I) was lower than in the case of group II ejaculates
already at collection.
where: yijklm- observed fertility trait - general population average Bi- fixed influence of the breed (i=123) Fj- fixed influence of the class AFE (j=123) Mk- fixed influence of the class LM (k=123) Gl- fixed influence of the class ADG (l=123) b (xijklm - ) linear regression effect of the boar age at the time when ejaculates
were taken and eijklm- random error.
4) A very low pH indicates acidic prostate fluid ejaculate
, such as in cases of CBAVD.
the presence of motile sperm in the ejaculate
at 3 to 6 months post-vasectomy) ranges from 0.
where TA is the total number (in millions) of spermatozoids in the whole ejaculate
, A is the percentage of active spermatozoids, and NK the percentage of normokinetic spermatozoids.
It also appears now that if there are even two million motile sperm in an ejaculate
-- a minimal total motile count is usually considered to be about 20 million -- that concentrating these sperm into a small volume for intrauterine insemination may work in some cases if the expense of ART is considered to be too high.
Males may respond to an increased risk of sperm competition by guarding for longer durations (Sherman, 1983; Wilber, 1989; Jablonski and Kaczanowski, 1994) or by passing larger ejaculates
(Svard and Wiklund, 1989; Gage, 1991; Eady, 1995; Gage and Barnard, 1996), which displace more of a previous inseminator's sperm or prevent dilution by a subsequent inseminator.
In other species, large ejaculates
have been found to enhance male fertilization success by various means but to have no effect on female productivity, and so have been interpreted as a form of mating effort (Greenfield 1982; Jones et al.
It becomes less likely the fewer sperm a male ejaculates
, and males may release fewer sperm per copulation with their mate than with other females.
The researchers suggest that this may be because they are extracting fluids from the ejaculates
In vitro comparison of fowl sperm viability in ejaculates
frozen by three different techniques and relationship with subsequent fertility in vivo.
If a man ejaculates
before he or his partner is satisfied then this is a problem.