Effects of acrosomal conditions of frozen-thawed spermatozoa on the results of artificial
insemination in Japanese Black cattle |
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Authors: | Kazumi KISHIDA Mitsuhiro SAKASE Kenta MINAMI Miyuki M ARAI Reiko SYOJI Namiko KOHAMA Takayuki AKIYAMA Akio OKA Hiroshi HARAYAMA Moriyuki FUKUSHIMA |
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Institution: | 1)Division of Animal Science, Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University, Kobe 657-8501, Japan;2)Department of Obstetrics and Gynecology, Shiga University of Medical Science, Otsu 520-2192, Japan;3)Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forest and Fishery, Asago 669-5254, Japan |
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Abstract: | The purposes of this study were to examine the relationship between male artificial insemination (AI)
fertility and sperm acrosomal conditions assessed by new and conventional staining techniques and to identify
possible reproductive dysfunctions causing low conception rates in AI using frozen-thawed spermatozoa with
poor acrosomal conditions in Japanese Black bulls. We investigated individual differences among bulls in the
results concerning (1) acrosomal conditions of frozen-thawed spermatozoa as assessed by not merely peanut
agglutinin-lectin staining (a conventional staining technique) but also immunostaining of acrosomal
tyrosine-phosphorylated proteins (a new staining technique), (2) routine AI using frozen-thawed spermatozoa as
assessed by pregnancy diagnosis, (3) in vivo fertilization of frozen-thawed spermatozoa and
early development of fertilized eggs as assessed by superovulation/AI-embryo collection tests and (4)
in vitro fertilization of frozen-thawed spermatozoa with oocytes. The percentages of
frozen-thawed spermatozoa with normal acrosomal conditions assessed by the abovementioned staining techniques
were significantly correlated with the conception rates of routine AI, rates of transferable embryos in
superovulation/AI-embryo collection tests and in vitro fertilization rates. These results are
consistent with new suggestions that the distribution of acrosomal tyrosine-phosphorylated proteins as well as
the acrosomal morphology of frozen-thawed spermatozoa are AI fertility-associated markers that are valid for
the prediction of AI results and that low conception rates in AI using frozen-thawed spermatozoa with poor
acrosomal conditions result from reproductive dysfunctions in the processes between sperm insemination into
females and early embryo development, probably failed fertilization of frozen-thawed spermatozoa with
oocytes. |
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Keywords: | Acrosome Artificial insemination Cattle Sperm Subfertility |
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