Document Detail

Equine chorionic gonadotropin improves the efficacy of a timed artificial insemination protocol in buffalo during the nonbreeding season.
MedLine Citation:
PMID:  23154144     Owner:  NLM     Status:  Publisher    
Two experiments were conducted to evaluate the effects of equine chorionic gonadotropin (eCG) treatment on ovarian follicular response, luteal function, and pregnancy in buffaloes subjected to a timed artificial insemination (TAI) protocol during the nonbreeding season. In experiment 1, 59 buffalo cows were randomly assigned to two groups (with and without eCG). On the first day of the synchronization protocol (Day 0), cows received an intravaginal progesterone (P4) device plus 2.0 mg estradiol benzoate im. On Day 9, the P4 device was removed, all cows were given 0.150 mg PGF(2α) im, and half were given 400 IU eCG im. On Day 11, all cows were given 10 μg of buserelin acetate im (GnRH). Transrectal ultrasonography of the ovaries was performed on Days 0 and 9 to determine the presence and diameter of the largest follicle; between Days 11 and 14 (12 hours apart), to evaluate the dominant follicle diameter and the interval from device removal to ovulation; and on Days 16, 20, and 24 to measure CL diameter. Blood samples were collected on Days 16, 20, and 24 to measure serum P4. In experiment 2, 256 buffaloes were assigned to the same treatments described in experiment 1, and TAI was performed 16 hours after GnRH treatment. Pregnancy diagnosis was performed by ultrasonography 30 days after TAI. Treatment with eCG increased the maximum diameter of dominant follicles (P = 0.09), ovulation rate (P = 0.05), CL diameter (P = 0.03), and P4 concentrations (P = 0.01) 4 days after TAI, and pregnancy per AI (52.7%, 68/129 vs. 39.4%, 50/127; P = 0.03). Therefore, eCG improved ovarian follicular response, luteal function during the subsequent diestrus, and fertility for buffalo subjected to a TAI synchronization protocol during the nonbreeding season.
N A T Carvalho; J G Soares; R M Porto Filho; L U Gimenes; D C Souza; M Nichi; J S Sales; P S Baruselli
Related Documents :
7204244 - Toxoplasma-induced abortion in dairy goats.
12870064 - Incidence of congenital toxoplasmosis in southern brazil: a prospective study.
24814194 - Thromboembolism in pregnancy: challenges and controversies in the prevention of pregnan...
1963124 - Herpes simplex and human papillomavirus genital infections: controversy over obstetric ...
8473454 - Improvement of clinical pregnancy rate and implantation rate of in-vitro fertilization-...
12835194 - Violence against women in mexico: a study of abuse before and during pregnancy.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-12
Journal Detail:
Title:  Theriogenology     Volume:  -     ISSN:  1879-3231     ISO Abbreviation:  Theriogenology     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-16     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.
Unidade de Pesquisa e Desenvolvimento de Registro/Pólo Regional do Vale do Ribeira/APTA, Registro, São Paulo, Brazil. Electronic address:
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:  Differential gene expressions in testes of L2 strain Taiwan country chicken in response to acute hea...
Next Document:  Why do singletons conceived after assisted reproduction technology have adverse perinatal outcome? S...