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Conception rate with the use of sexed semen is lower than that with the use of conventional semen, posing a major problem in the dairy industry. The aim of this study was to understand the risk factors that affect the conception rate after artificial insemination (AI) with conventional and sexed semen using field data. The records of the first insemination in Holstein heifers with conventional (n = 41,857) and sexed semen (n = 45,465) in Hokkaido, Japan were analyzed. The mean conception rate after AI from 2012 to 2016 was 56.9% with conventional semen and 47.3% with sexed semen. A multivariable logistic regression model including the effects of year, heifer age, time of the year, semen type, service sire, and their interactions was used to evaluate the interaction effect of heifer age and time of the year by semen type on the conception rate. In the analysis using heifer age, we found that heifers inseminated with sexed semen were approximately 21 days younger than those inseminated with conventional semen. Interestingly, in early, warmer months (Jun, Jul, and Aug), the conception rate after AI with sexed semen significantly decreased compared with that after AI with conventional semen (P < 0.01). Our results showed that more careful implementation of AI is required for a stable conception using sexed semen, particularly during warmer months.
This article was published in the following journal.
Equine reproduction is unique by having long behavioral estrus and differences in time of breeding between breeds and individuals of mares. An experimental study was conducted at the Balderas Sport Ho...
The objectives were the determine the effects of presynchronization with PGF 2 days before the 5-d timed artificial insemination (AI) protocol on ovarian responses and pregnancy per AI (P/AI) in dairy...
Artificial insemination using sex-sorted semen is employed to efficiently increase the number of female dairy calves born. Previous studies have determined that using sex-sorted semen is beneficial to...
This study aimed to explore associations between semen quality and trace element level in serum and seminal plasma in Yorkshire boars. Semen quality of 112 Yorkshire boars was assessed for 13 weeks to...
Poor fertilization during conventional IVF is difficult to predict in the absence of abnormal semen parameters; large-scale studies are lacking. The purpose of this study is to evaluate factors associ...
This is a prospective, non-randomized, open-label study to look at the uptake, adherence to, and impact of pre-exposure prophylaxis (PrEP), antiretroviral therapy (ART), semen washing, and...
The proposed research aims to study the effects of antioxidant therapy, commonly used in male infertility treatment, on semen analysis. Patients presenting with male infertility, who are f...
The objective of this study is to determine if concentrations of maraviroc in semen exceed the 50% and 95% inhibitory concentrations of HIV during the dose interval. The secondary objecti...
The objective of this study is to determine if concentrations of raltegravir in semen exceed the 50% and 95% inhibitory concentrations of HIV during the dose interval. The secondary objec...
Proanthocyanidins are a class of polyphenols found in a variety of plants that have antioxidant activity in vitro, which is stronger than vitamin C or vitamin E. Several studies have been...
A congenital reproductive abnormality in white female offspring (heifers) in certain breeds of CATTLE, such as Belgian Blue and Shorthorn. The white color is inherited as a recessive trait which is associated with defects in the female reproductive tract (Muellerian system). These heifers are usually sterile.
Comparison of various psychological, sociological, or cultural factors in order to assess the similarities or diversities occurring in two or more different cultures or societies.
The quality of SEMEN, an indicator of male fertility, can be determined by semen volume, pH, sperm concentration (SPERM COUNT), total sperm number, sperm viability, sperm vigor (SPERM MOTILITY), normal sperm morphology, ACROSOME integrity, and the concentration of WHITE BLOOD CELLS.
The ratio of the number of conceptions (CONCEPTION) including LIVE BIRTH; STILLBIRTH; and fetal losses, to the mean number of females of reproductive age in a population during a set time period.
A condition characterized by the complete absence of SEMEN. This disorder should be differentiated from AZOOSPERMIA, absence of sperm in the semen.