HORMONAL APPROACH FOR AUGMENTING THE FERTILITY IN REPEAT BREEDING CROSSBRED COWS
| dc.contributor.advisor | SESHAGIRI RAO, A (Major) | |
| dc.contributor.advisor | MOULI KRISHNA, K | |
| dc.contributor.advisor | SURESH KUMAR, R.V | |
| dc.contributor.author | ABHILASH, R S | |
| dc.date.accessioned | 2016-12-20T23:31:56Z | |
| dc.date.available | 2016-12-20T23:31:56Z | |
| dc.date.issued | 2003-08 | |
| dc.description.abstract | ABSTRACT : The present investigation "Hormonal approach for augmenting the fertility in repeat breeding crossbred cows" was carried out in 80 repeat breeding and 40 normal breeding crossbred cows to find out incidence of repeat breeding, to study the various aspects of estrous cycle viz., interestrous interval, duration of estrus and ovulation time in normal and repeat breeders and for comparing the trace mineral levels in normal and repeat breeders to detect the possible causes of repeat breeding. The treatments with GnRH, hCG and progesterone were exercised in repeat breeder cows. The incidence of repeat breeding in crossbred cows was observed to be 10.17 per cent. The mean values of copper, manganese and zinc were found to be 0.86 ± 0.07 Vs 1.22 ± 0.10, 0.22 ± 0.01 Vs 0.37 ± 0.09 and 1.17 ± 0.10 Vs 1.87 ± 0.15 ppm respectively in repeat and normal breeders and noticed to be significantly lower level in repeat breeders. Whereas, the iron level did not vary much (2.57 ± 0.13 Vs 2.44 ± 0.14). The length of estrous cycle (inter estrous interval) was observed to be short, normal and long in 10.00, 55.00 and 35.00 per cent respectively for normal breeders and 17.50, 48.75 and 33.75 per cent respectively for repeat breeders. In the present study the duration of estrus was observed to be longer in 70.00 per cent of repeat breeders and 50.00 per cent of normal breeders. The time of ovulation was found to be normal in 50.00 per cent of repeat breeders and 80.00 per cent of normal breeders, delayed in 38.75 per cent of repeat breeders and 15.00 per cent of normal breeders and ovulation failure was noticed in 11.25 per cent of repeat breeders and 5.00 per cent of normal breeders. In the present study more per cent of animals exhibited estrus with in 24 hrs after treatment when compared to before treatment in GnRH treated (75.00 Vs 40.00 per cent) and in hCG treated (85.00 Vs 45.00 per cent) repeat breeding crossbred cows. Similarly the number of animals exhibited longer duration of estrus (24-36 hrs and > 36 hrs) were decreased after treatment in GnRH and hCG (20.00 Vs 35.00, 5.00 Vs 25.00 and 15.00 Vs 35.00, 0.00 Vs 20.00 per cent) treated cows. However, much difference could not be observed in the progesterone treated cows. More per cent of animals were observed to ovulate within the normal ovulation time of <16 hrs after treatment with GnRH (80.00 Vs 35.00 per cent) and with hCG (85.00 Vs 45.00 per cent) when compared to before treatment. Similarly, the number of animals ovulated in an abnormal period 16-48 hrs and more than 48 hrs were decreased after treatment in these groups (20.00 Vs 45.00, 0.00 Vs 20.00, 15.00 Vs 40.00 and 0.00 Vs 15.00 per cent). However, not much difference was observed in the cows treated with progesterone. The conception rates of repeat breeding crossbred cows to first insemination, second insemination and overall were observed to be 45.00, 9.10 and 50.00 per cent in GnRH treated group; 60.00, 12.50 and 65.00 per cent for hCG treated group; 35, 15.38 and 45.00 per cent for progesterone treated group and 10.00, 11.11 and 20.00 per cent for control groups. To conclude in the present study, delayed ovulations and early embryonic mortality arose as the root cause for repeat breeding in crossbred cows. Both GnRH and hCG exhibited the effect on synchronization of duration of estrus and ovulation time. Improved conception rates were observed in all the three hormone treated crossbred cows when compared to control animals | en_US |
| dc.description.sponsorship | DEPARTMENT OF ANIMAL REPRODUCTION & GYNAECOLOGY COLLEGE OF VETERINARY SCIENCE, TIRUPATI | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/91639 | |
| dc.language.iso | en | en_US |
| dc.publisher | SRI VENKATESWARA VETERINARY UNIVERSITY , TIRUPATI – 517 502 (A.P) INDIA | en_US |
| dc.sub | Animal Reproduction and Gynecology | en_US |
| dc.subject | CROSSBRED COWS; REPEAT BREEDING; HORMONAL APPROACH; FERTILITY | en_US |
| dc.these.type | M.V.Sc. | |
| dc.title | HORMONAL APPROACH FOR AUGMENTING THE FERTILITY IN REPEAT BREEDING CROSSBRED COWS | en_US |
| dc.title.alternative | MVSc; CVSc, TIRUPATI; Acc No: T982 | en_US |
| dc.type | Thesis | en_US |