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Volume 32, Number 4 >

EFFECTS OF LH-RH ANALOGUE ON THE OVULATION RATE AND EMBRYO QUALITY IN HEIFERS SUPEROVULATED WITH PMSG AND PGF_2α

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Please use this identifier to cite or link to this item:https://doi.org/10.14943/jjvr.32.4.183

Title: EFFECTS OF LH-RH ANALOGUE ON THE OVULATION RATE AND EMBRYO QUALITY IN HEIFERS SUPEROVULATED WITH PMSG AND PGF_2α
Authors: TAKAHASHI, Yoshiyuki Browse this author
KANAGAWA, Hiroshi Browse this author
Keywords: Superovulation
embryo
PMSG
LH-RH analogue
heifer
Issue Date: 20-Oct-1984
Publisher: The Graduate School of Veterinary Medicine
Journal Title: Japanese Journal of Veterinary Research
Volume: 32
Issue: 4
Start Page: 183
End Page: 189
Abstract: Eighty-four Holstein-Friesian virgin heifers were superovulated with either 2500 or 3000 IU of PMSG in addition to 30 mg of PGF_2α. The heifers were divided into two groups. Approximately half of them were administered LH-RH analogue twice at 1.5 hour intervals during the superovulatory estrus (treated), and the remaining animals were not treated with LH-RH analogue (control). Nonsurgical embryo recovery was performed 7 or 8 days after estrus. In the control heifers, effects of the dose of PMSG were examined, and it was found that by increasing the dose from 2500 to 3000 IU, a significantly larger number of corpora lutea and total number of eggs were observed (P<0.05). However, the number of good embryos was not increased. These effects of LH-RH analogue were analyzed by comparing the treated and the untreated control heifers following the injection of the same dose of PMSG. The treatment with LH-RH analogue was effective in increasing significantly the number of ovulations and the total number of eggs and good embryos recovered (P<0.05) when the heifers also received 2500 IU of PMSG. The heifers received 3000 IU of PMSG did not show significant responses to LH-RH analogue, but the tendency of a higher percentage of good embryos was recorded.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/2312
Appears in Collections:Japanese Journal of Veterinary Research > Volume 32, Number 4

Submitter: 高橋 芳幸

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