|
KMID : 0359319810210010059
|
|
Korean Journal of Veterinary Research
1981 Volume.21 No. 1 p.59 ~ p.64
|
|
|
Effects of Gonadotropin - Releasing Hormone on Reproductive Performance of Early Postpartum Dairy Cows and Cystic Cows
|
|
|
|
|
Abstract
|
|
|
Holstein-Friesian cows(n=284) were given 100㎍ of gonadotropin-releasing hormone(GnRH) or saline solution by intramuscular injection at 10 to 22 days after parturition, and were investigated their reproductive performance and frequency of ovarian cysts.
Among them 28 cystic cows were injected with 150㎍ of GnRH intramuscularly and examined the recovery rate.
The results obtained in this study were summarized as follows:
1. The interval from calving to 1st ovulation was reduced from 28.2 days in controls to 16.5 days for cows given GnRH (p<0.01).
2. The intervals from calving to 1st estrus and from calving to conception were extended significantly in control group (p<0.05).
3. Inseminations per conception and conception rate at 1st insemination did not reveal difference between two groups.
4. Frequency of ovarian cysts was reduced from 14.0% in control to 4.20% for cows given GnRH (p<0.05).
5. Of the 28 cystic cows receiving 150㎍ of GnRH, 23(82.1%) responded to 1st treatment and returned to estrus 24.2±4.3 days after treatment.
6. These data provide evidence for reduction in infertility and reproductive disorders in early postpartum dairy cows given GnRH as a prophylactic.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|