Reproductive consequences of using sexed semen in Holstein dairy herds of Isfahan province

Document Type : Research Paper


1 M.Sc. Student, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Iran

2 Assistant Professor, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Iran

3 Professorr, Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Iran


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. Rate of female born of sexed semen (86.3%) was 1.8 times higher than those of conventional semen (48.5%). Conception rate was generally decreased in three first services from 61.0% to 47.2% (P<0.001) in group of using sexed semen. Use of sexed semen was significantly decreased the incidence of dystocia in heifers (from 20.3% to 16.8%). There was no significant difference in abortion and stillbirth incidences between two groups of semen (P>0.05). The  results of  this study  can  used  for  analyses  of  cost- revenue  for using sex-sorted semen dairy herds.


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