Superovulatory response, embryo collection and transfer in crossbred cows
| dc.contributor.advisor | Suresan Nair, S P | |
| dc.contributor.author | Unnikrishnan, M P | |
| dc.contributor.author | KAU | |
| dc.date.accessioned | 2020-11-18T09:29:18Z | |
| dc.date.available | 2020-11-18T09:29:18Z | |
| dc.date.issued | 1996 | |
| dc.description | MVSc | en_US |
| dc.description.abstract | Out of eleven crossbred cows superovulated with 2000 IU of PMSG on day eleven and 25 mg PGF2 alpha 48 h later, nine animals (81.8%) exhibited oestrum after an average interval of 39.44 ± 2.44 h. Average duration of oestrum was 40.00 ± 2.00 h with 66.7 per cent of them exhibiting intense heat signs and 33.3 per cent exhibiting only moderate heat signs. Average number of corpora lutea and unovulated follicles in both the ovaries put together was 6.67 ± 0.50 and 6.22 ± 0.57 respectively. Ovarian response was more in right ovary than in left ovary, though not statistically significant. Average fluid recovery on flushing was 79.5 per cent which was comparatively low. The average embryo recovery and percentage of embryo recovery were 3.38 ± 0.70 and 53.11 ± 10.18 respectively, which was comparatively lower. The reason for poor recovery of embryo was attributed to poor fluid recovery on flushing. The average number and percentage of transferrable embryo recovered were 1.50 ± 0.53 and 33.34 ± 10.14. Reason for these lower rates were attributed to loss of embryo quality, due to prolonged action of PMSG. Donors of parity over three performed better on superovulation and flushing, than those below three. Animals of age group six to nine years produced more transferrable embryos than cows of age group ten and above. A conception rate of 30 per cent was achieved after transfer of embryos to naturally synchronised recipients. Heifers appeared to be better recipients than cows. Although a high incidence of abortion was encountered, birth of an embryo transfer male calf was also recorded in the study. All the donor cows came into regular oestrous cycle within four months of superovulation treatment. | en_US |
| dc.identifier.citation | 171187 | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810155213 | |
| dc.keywords | Animal Reproduction | en_US |
| dc.language.iso | English | en_US |
| dc.publisher | Department of Animal Reproduction, College of Veterinary and Animal Sciences, Mannuthy | en_US |
| dc.sub | Animal Reproduction and Gynecology | en_US |
| dc.theme | Embryo collection and transfer in crossbred cows | en_US |
| dc.these.type | M.V.Sc. | en_US |
| dc.title | Superovulatory response, embryo collection and transfer in crossbred cows | en_US |
| dc.type | Thesis | en_US |