Document Detail

Starting Ovsynch protocol on day 6 of first postpartum estrous cycle increased fertility in dairy cows by affecting ovarian response during heat stress.
MedLine Citation:
PMID:  25129638     Owner:  NLM     Status:  Publisher    
The objective was to compare fertility in cows using an Ovsynch protocol starting on day 6 of first postpartum estrous cycle with an Ovsynch protocol initiated at random stages of the estrous cycle during heat stress (temperature-humidity index (THI)=77-83). Cows (n=459) at the beginning of the lactation period were randomly assigned to time-of-ovulation synchronization treatments: (1) control, Ovsynch (first GnRH treatment, PGF2α treatment 7 days later, second GnRH treatment 56h later, and TAI 16h later), initiated at random stages of the estrous cycle (40±2days postpartum, n=224) and (2) Ovsynch initiated on day 6 of first postpartum estrous cycle (estrus=day 0) based on detection of the first estrus after day 30 postpartum (O6, 35±2 postpartum, n=235). Statistical analyses were conducted using SAS. The percentage of cows responding to the initial GnRH injection using the Ovsynch protocol was greater with the O6 treatment compared to the control treatment (60.4% compared with 52.6%). The percentage of cows having a corpus luteum (CL) on the day of the PGF2α injection was not different among treatments (control=87.0% and O6=90.2%, respectively). Also more cows in the O6 treatment group responded to the second GnRH injection of the Ovsynch protocol compared with control treatments (82.5% compared with 75.8%). Treatment affected the percentage of cows diagnosed pregnant at 32±0.7days and 60±3days after the resynchronized timing of AI but pregnancy losses (5.3% compared with 6.8%) did not differ between treatment groups. It is concluded that initiating the Ovsynch protocol 6 days after estrus during the first 40 days postpartum resulted in a greater pregnancy rate at the synchronized estrus and increased fertility compared with control cows during heat stress.
E Dirandeh
Related Documents :
8541608 - Cardiomyocyte proliferation and hypertrophy in the human fetus: quantitative study of t...
471868 - Central circulatory responses in normotensive and hypertensive pregnancy.
7774748 - Thoracic electrical bioimpedance: suitable for monitoring stroke volume during pregnancy?
1837198 - Peripartum cardiomyopathy: a case report.
25356288 - Sexual activity during pregnancy in taiwan: a qualitative study.
21120498 - The treatment of rheumatoid arthritis during pregnancy.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-8-2
Journal Detail:
Title:  Animal reproduction science     Volume:  -     ISSN:  1873-2232     ISO Abbreviation:  Anim. Reprod. Sci.     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-8-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7807205     Medline TA:  Anim Reprod Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier B.V. All rights reserved.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Protein supplementation during a short-interval prostaglandin-based protocol for timed AI in sheep.
Next Document:  Impact of persistent smoking on long-term outcomes in patients with nonvalvular atrial fibrillation.