Document Detail

Comparison of two types of CIDR-based timed artificial insemination protocols for repeat breeder dairy cows.
MedLine Citation:
PMID:  17327684     Owner:  NLM     Status:  MEDLINE    
This study compared two types of controlled internal drug release (CIDR)-based timed artificial insemination (TAI) protocol for treatment of repeat breeder dairy cows. In the first trial of the experiment, 55 repeat breeder cows were randomly assigned to the following two treatments. (1) In the EB group, a CIDR device was inserted into the cows, and then the cows were administered an injection of 1 mg estradiol benzoate (EB) plus 50 mg progesterone (P4; Day 0). On Day 7, they were given an injection of PGF(2alpha) and the CIDR device was removed. The cows were given an injection of 1 mg EB on Day 8 and were subjected to TAI 30 h later (n=27). (2) In the gonadotrophin releasing hormone (GnRH) group, a CIDR device was inserted into the cows, and then the cows were administered an injection of 250 microg gonadorelin (GnRH; Day 0). On Day 7, they were given an injection of PGF(2alpha) and the CIDR device was removed. The cows were given an injection of 250 microg GnRH on Day 9 and were subjected to TAI 17 h later (n=28). In the second trial, 41 repeat breeder cows that were confirmed as not pregnant in the first trial were randomly assigned to the same two treatments used in the first trial (an EB group of 20 cows and a GnRH group of 21 cows). The ovaries of 15 cows from each group were examined by transrectal ultrasonography in order to observe the changes in ovarian structures, and blood samples were collected for analysis of serum P4 concentrations. The pregnancy rates following TAI in the first (18.5 vs. 32.1%) and second (40.0 vs. 38.1%) trials and the combined rates (27.7 vs. 34.7%) did not differ between the EB and GnRH groups. The proportions of cows with follicular wave emergence within 7 days did not differ between the EB (12/15) and GnRH groups (13/15). The interval to wave emergence was shorter (P<0.01) in the GnRH group than in the EB group, but there was no difference in the mean diameters of dominant follicles on Day 7 between the groups. Moreover, the proportions of cows with synchronized ovulation following a second EB or GnRH treatment did not differ between the groups. In conclusion, treatment with either EB or GnRH in a CIDR-based TAI protocol results in synchronous follicular wave emergence, follicular development, synchronous ovulation, and similar pregnancy rates for TAI in repeat breeder cows.
Ui-Hyung Kim; Guk-Hyun Suh; Tai-Young Hur; Seog-Jin Kang; Hyun-Gu Kang; Soo-Bong Park; Hyeon-Shup Kim; Ill-Hwa Kim
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2007-02-28
Journal Detail:
Title:  The Journal of reproduction and development     Volume:  53     ISSN:  0916-8818     ISO Abbreviation:  J. Reprod. Dev.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-07-09     Completed Date:  2007-10-19     Revised Date:  2007-11-23    
Medline Journal Info:
Nlm Unique ID:  9438792     Medline TA:  J Reprod Dev     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  639-45     Citation Subset:  IM    
Laboratory of Theriogenology, College of Veterinary Medicine, Chungbuk National University, Korea.
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MeSH Terms
Dinoprost / administration & dosage*
Estradiol / administration & dosage,  analogs & derivatives*
Gonadotropin-Releasing Hormone / administration & dosage*
Insemination, Artificial / methods*
Ovarian Follicle / drug effects
Ovulation / drug effects
Oxytocics / administration & dosage*
Pregnancy Rate
Progesterone / administration & dosage*,  blood
Progestins / administration & dosage*
Time Factors
Reg. No./Substance:
0/Oxytocics; 0/Progestins; 33515-09-2/Gonadotropin-Releasing Hormone; 50-28-2/Estradiol; 50-50-0/estradiol 3-benzoate; 551-11-1/Dinoprost; 57-83-0/Progesterone

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