A Study On The Effect Of Gnrh Analogue On Anovulation In Repeat Breeding Cross Bred Cows And Their Conception Rate
By: Asif Rafiq
| Prof.Dr.Rashid Ahmed Ch.
Contributor(s): Dr.Imtiaz Hussain Khan | Dr.Muhammad | Faculty of Veterinary Sciences.
Material type: 
BookPublisher: 1999Subject(s): Department of TheriogenologyDDC classification: 0623,T Dissertation note: The incidence of repeat breeding is high in cross-bred cows due to low LH level in the blood at the time of estrous. In this study Dalmarelin a GnRH analogue which induces ovulation in cows was used. Nine healthy animals with the history of repeat breeding and clinically normal genital tract were selected at the Livestock Production and Research Institute, Qadirabad, Okara. These animals were injected with dalmarelin (Lecirelin), at the dose rate of 2 ml IM. The injection was given on the zero day of estrous and later animals were inseminated artificially. Two blood samples were collected from these animals, one before the injection and artificial insemination i.e. on the zero day of estrous and the second at 10th day after the injection of Lacirelin for the detection of plasma progesterone concentration. Results indicated that five animals i.e. 55.5% had conceived. Similarly when detected 12 hours after the end of estrous five animals had ovulated out of which three animals were conceived. Finally, these animals were palpated rectally on the 90th day after artificial insemination and five animals with high concentration of progesterone on the 10th day, were, detected positive for pregnancy. None of the control animals ovulated and conceived.
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Thesis
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UVAS Library Thesis Section | Veterinary Science | 0623,T (Browse shelf) | Available | 0623,T |
The incidence of repeat breeding is high in cross-bred cows due to low LH level in the blood at the time of estrous. In this study Dalmarelin a GnRH analogue which induces ovulation in cows was used. Nine healthy animals with the history of repeat breeding and clinically normal genital tract were selected at the Livestock Production and Research Institute, Qadirabad, Okara. These animals were injected with dalmarelin (Lecirelin), at the dose rate of 2 ml IM. The injection was given on the zero day of estrous and later animals were inseminated artificially. Two blood samples were collected from these animals, one before the injection and artificial insemination i.e. on the zero day of estrous and the second at 10th day after the injection of Lacirelin for the detection of plasma progesterone concentration. Results indicated that five animals i.e. 55.5% had conceived. Similarly when detected 12 hours after the end of estrous five animals had ovulated out of which three animals were conceived. Finally, these animals were palpated rectally on the 90th day after artificial insemination and five animals with high concentration of progesterone on the 10th day, were, detected positive for pregnancy. None of the control animals ovulated and conceived.
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