Document Detail

Pregnancy rates of lactating cows after transfer of in vitro produced embryos using X-sorted sperm.
MedLine Citation:
PMID:  23182749     Owner:  NLM     Status:  Publisher    
The main objective was to determine the efficacy of using X-sorted sperm to produce embryos in vitro for transfer into lactating dairy cows. Cows were bred by timed artificial insemination (TAI) using nonsorted semen or X-sorted sperm, or they received a fresh embryo produced in vitro by fertilization with X-sorted or nonsorted sperm using timed embryo transfer (TET). Pregnancy rates at approximately Day 32 averaged over all dairies were 39.3 ± 3.2% (least-squares mean ± SEM) for TAI nonsorted, 27.3 ± 3.4% for TET nonsorted fresh embryos, and 30.2 ± 3.3% for TET X-sorted fresh embryos (TAI vs. both TET groups, P < 0.05; 206 to 233 cows per group). Pregnancy losses between approximately Day 32 and term ranged from 16% to 37%, the latter from TET with X-sorted sperm. Pregnancy losses to term were higher for cows receiving embryos produced in vitro than for cows bred by TAI. Calves produced via TET were not substantively different from AI controls in physical measurements or standard blood chemistry profiles.
S Rasmussen; J Block; G E Seidel; Z Brink; K McSweeney; P W Farin; L Bonilla; P J Hansen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-23
Journal Detail:
Title:  Theriogenology     Volume:  -     ISSN:  1879-3231     ISO Abbreviation:  Theriogenology     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
Animal Reproduction and Biotechnology Laboratory, Colorado State University, Fort Collins, Colorado, USA.
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