Induction of multiple ovulation in rabbits using PMSG and hCG

Published: Jan 25, 2018
Rabbits does multiple ovulation PMSG

In the present study, the feasibility of the effective use of a simplified method for multiple ovulation and for the collection of oocytes-zygotes-embryos (O-Z-E) was investigated. The relationship between the number and quality of O-Z-E and the color of the mucosa of the vulva was also studied. Thirty five New Zealand does and 5 California bucks were used. Does were given one dose of 20 IU/Kg BW of PMSG i.m. Artificial insemination (AI) and administration of a dose of 120 IU/animal of hCG i.v. were carried out 3 days later. Does were sacrificed 19h after AI and the O-Z-E were collected by flushing of the oviducts. 54,24% of the does presented multiple ovulation (Group A), 40,00% did not present the expected (< 10 corpora lutea) reaction (group B) and 5,71% presented no reaction at all to hormone administration. The mean values of O-Z-E collected was 18,53±10,77 in group A and 6,69±5,49 in group Β (P<0,05). However, the mean values of O-Z-E in each group were similar in does presenting different color of the mucosa of the vulva. The color of the mucosa of the vulva was not related to multiple ovulation rates in both groups. In group A, the highest (P<0,05) percentage of O-Z-E was collected from does presenting red color of the mucosa of the vulva (96,20%) and the lowest from does presenting purple color (66,08%). However, the color of the mucosa of the vulva did not affect the percentage of zygotes-embryos (Z-E) that were appropriate for use and ranged from 65,71 to 72,67%. In group B, the color of the mucosa of the vulva did not affect the percentage of O-Z-E, that ranged from 84,00 to 96,43%. However, the percentage of Z-E that were appropriate for further use (a Z-E) was significantly different (P<0,05) and ranged from 33,30% in does presenting rosy color to 84,38% in does presenting purple color of of the mucosa of the vulva. We conclude that, the results of this method are satisfactory and the color of the mucosa of the vulva may be used as a factor in the selection of donors.

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