the objective of this study was to explore the reproductive consequences of using sex-sorted semen on sex ratio, conception rate and reproductive disorders (dystocia, abortion, stillbirth) in holstein heifers. reproduction performances records which were collected during 2006 to 2013 from 4 large dairy herds in isfahan province of iran were used and analyzed by genmod procedure of sas software....

The preparation of sexed semen is based on the differential DNA content between the X and Y chromosome bearing sperm cells determined by fluorescence-activated cell sorting. In spite of its intrinsic limitations this represents the only effective method. However, the employment of sexed sperm for breeding food producing animals on a large scale requires additional knowledge in the protein reper...

There are many procedures available for evaluating semen, and except for culling obviously inferior samples, none of the procedures is highly correlated with fertility. The most commonly used method is estimating sperm motility subjectively, and this method is appropriate for culling substandard semen; this approach also can be used for more stringent quality control and for experiments if done...

The current technology to sort X and Y chromosome bearing sperm population requires individual identification and selection of spermatozoa in a modified high-speed flow cytometer. For farm animal species, the technology is capable of producing sexed sperm at greater than 90% purity. However, only in the bovine, the technology has reached a developmental level that allows its commercial applicat...

This study aimed to determine if 200 μg of GnRH (gonadorelin hydrochloride) would increase ovulatory response and pregnancies per AI (P/AI) compared with 100 at the first breeding-Ovsynch a Double-Ovsynch program (DO) in lactating Holstein cows. Weekly cohorts primiparous (n = 719) multiparous 1,191) cows submitted DO [GnRH – 7 d PGF2α 3 (G1) (PG1) 1 ~32 h (G2) ~16 TAI] for timed-artificial ins...

This review focuses on the platform of recent advances in reproductive biotechnologies in sheep and goat. Here, we discuss some aspects of veterinary and biomedical importance in artificial insemination using sexed semen, in vitro/in vivo fertilization, interspecies in vitro fertilization, multiple ovulation and embryo transfer (MOET), somatic cell nuclear transfer and transgenic animal product...