Effect of Melatonin Implantation to Sperm Donor Rams on Post-thaw Viability and Acrosomal Integrity of Sperm Cells in the Breeding and Non-breeding Season

2001 ◽  
Vol 36 (3-4) ◽  
pp. 211-215 ◽  
Author(s):  
A Kaya ◽  
M Aksoy ◽  
N Baspınar ◽  
C Yıldız ◽  
MB Ataman
Keyword(s):  
Breeding Season ◽  
Sperm Cells ◽  
Sperm Donor ◽  
Acrosomal Integrity

scholarly journals A Unique Conjunction: Evidence for Gynogenesis Accompanying Haplodiploid Sex Determination in the Australian Ant Myrmecia impaternata Taylor

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Robert W. Taylor ◽  
Hirotami T. Imai ◽  
Eisuke Hasegawa ◽  
Colin D. Beaton
Keyword(s):  
Host Species ◽  
Related Species ◽  
Parental Species ◽  
Female Offspring ◽  
Hybrid Origin ◽  
Sperm Cells ◽  
Reproductive Systems ◽  
Free Living ◽  
Sperm Donor ◽  
Diploid Female

Myrmecia impaternata is an allodiploid all-female species of hybrid origin. Its parental taxa are confirmed here to be M. banksi and M. pilosula. We suggest that its queens produce diploid female offspring by gynogenetic parthenogenesis, a process which requires interaction between unreduced maternal oocytes and allospecific sperm cells obtained by copulation with another related species. We propose that impaternata queens almost certainly mate for this purpose with males reared in impaternata nests from eggs laid by impaternata females. Because sex in ants is determined by haplodiploidy (males haploid, females diploid), we posit that these males would in fact not be technically conspecific with the females in whose reproductive systems they developed, since they would each carry the haploid genome of one or other of the hybridic parental species. They would therefore be individually identical karyologically to males of either M. banksi or M. pilosula and appropriately allospecific to M. impaternata. We postulate that, unlike all other known gynogens, M. impaternata would have no need to maintain parasitic affiliation or sympatry with free-living sperm-donor host species. Its queens are arguably able to produce the required allospecific males by accessing their own genomes. M. impaternata apparently originated by instantaneous speciation when individuals of its parental species first successfully hybridized.

scholarly journals Beyond sperm cells: a qualitative study on constructed meanings of the sperm donor in lesbian families

2014 ◽  
Vol 29 (6) ◽  
pp. 1248-1254 ◽  
Author(s):  
E. Wyverkens ◽  
V. Provoost ◽  
A. Ravelingien ◽  
P. De Sutter ◽  
G. Pennings ◽  
...  
Keyword(s):  
Qualitative Study ◽  
Sperm Cells ◽  
Sperm Donor ◽  
Lesbian Families

scholarly journals The impact of adding different levels of egg yolk on the motility and morphology pre and post thaw cryopreservation of goat semen

2019 ◽  
Vol 12 (1) ◽  
pp. 107-115
Author(s):  
Nawfal Mutlak
Keyword(s):  
Liquid Nitrogen ◽  
Breeding Season ◽  
Sperm Motility ◽  
Egg Yolk ◽  
Sperm Cells ◽  
Mass Activity ◽  
Semen Extender ◽  
Motility Of Sperm ◽  
The Impact ◽  
Different Levels

The aim of this study was to examine the effect of different concentrations of egg yolk EY (0%, 10%, and 20%) in the semen extender during the cryopreservation process of goat semen out of the breeding season. A total of 12 ejaculates were collected from six Anglo Nubain dairy bucks as two ejaculates for each buck aged between (1-5) years over a two week period by using Electro-ejaculation (EEJ) during the non-breeding season. Post collection, the semen samples were evaluated for motility and mass activity. Subsequently, the semen samples were initially diluted in Tris solution (without Egg yolk or Glycerol) in order to preserve the motility of sperm cells. The semen samples from each buck were evaluated for pre-freezing motility and morphology then divided into three sub-samples and diluted in Tris extender with T1 (control) 0% EY, T2 10% EY, and T3 20% EY. The semen samples were frozen in liquid nitrogen (-196 C). After thawing, the semen samples were evaluated for sperm motility and morphology. The morphology of sperm did not differ among treatments nor between pre-freezing and post-thawing evaluations. However, the motility of semen diluted with 10% EY was (P<0.05) numerically but not statistically higher than semen diluted with 0% and 20% EY. According to the obtained results of this study, it is recommended that a 10% EY level or less be included in the Tris extender during cryopreservation of goat semen for superior motility and morphology results.

Ultrastructure of Testicular Spermatozoon of the Fish Oreochromis Niloticus

1988 ◽  
Vol 46 ◽  
pp. 278-279
Author(s):  
T. Guha ◽  
A. Q. Siddiqui ◽  
P. F. Prentis
Keyword(s):  
Electron Microscope ◽  
Oreochromis Niloticus ◽  
Osmium Tetroxide ◽  
Sperm Cells ◽  
Adult Fish ◽  
Testicular Sperm ◽  
Thin Sections ◽  
Important Fish ◽  
Testicular Spermatozoon ◽  
Diamond Knife

Tilapia, Oreochromis niloticus, is an economically important fish in Saudi Arabia. Elucidation of reproductive biology of this species is necessary for successful breeding program. In this paper we describe fine structure of testicular sperm cells in O, niloticus.Testes from young adult fish were fixed in gluteraldehyde (2%) and osmium tetroxide (1%), both in cacodyl ate buffer. Specimens were processed in the conventional way for electron microscopy and thin sections of tissues (obtained by cutting the blocks with a diamond knife) were stained by ura- nyl acetate and lead citrate. These were examined in a Carl Zeiss electron microscope operated at 40 kV to 60 kV. Sperm cells were obtained from testes by squeezing them in cacodyl ate buffer. They were fixed in gluteraldehyde (2%) in the same buffer, air dried, gold coated and then examined in a Philips scanning electron microscope (SEM) operated at 25kV.The spermatozoon of O. niloticus is consisting of head, midpiece and tail (Fig. 1).

Observation on the breeding biology of Polypedates teraiensis (Dubois, 1987) (Amphibia: Rhacophoridae)

2017 ◽  
Vol 17 (1) ◽  
pp. 25-32
Author(s):  
Jacinta Lalchhanhimi ◽  
Lalremsanga H.T.
Keyword(s):  
Sexual Dimorphism ◽  
Breeding Season ◽  
Sound Production ◽  
Reproductive Function ◽  
Breeding Biology ◽  
Tree Frog ◽  
University Campus ◽  
Morphometric Measurements ◽  
Advertisement Calls ◽  
Males And Females

The breeding biology of tree frog, Polypedates teraiensis was studied during the breeding season at Mizoram University Campus. It was found that sound production by male during the breeding season was primarily a reproductive function and advertisement calls attract females to the breeding areas and announce other males that a given territory is occupied. The aim of this study was to provide the detailed information on the breeding behaviour and the advertisement calls of Polypedates teraiensis. The morphometric measurements of the amplecting pairs (males and females) for sexual dimorphism along with clutch sizes were also studied.

PATTERN OF 17-KETOSTEROID URINARY EXCRETION IN INFERTILE MEN

1963 ◽  
Vol 42 (1) ◽  
pp. 97-100
Author(s):  
Mirjam Furuhjelm ◽  
Birgit Johnson ◽  
C.-G. Lagergren
Keyword(s):  
Urinary Excretion ◽  
Sperm Cells ◽  
Infertile Men ◽  
Abnormal Cells

ABSTRACT The pattern of the 17-ketosteroid excretion determined according to Johnsen (1956) in a group of 33 sterile men was compared with that in another group of 14 men with proved fertility, and no difference was found. No correlation between 17-ketosteroid excretion and the concentration of sperm cells or the percentage of abnormal cells could be detected. The results are discussed.

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