Efficacy of Hormonal (PGF and eCG) Treatment on the Reproductive Performance of Muturu Cows Crossed with White Fulani Semen under Natural Grazing Condition: A Research Work

Nwakpu P. E. • Obianwuna U. • Olorunleke S. • Uchewa Uchewa • E. N.

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Abstract

An experiment was conducted at Abakaliki in Ebonyi State during the period of dry season(less rainfall) and onset of rainy season between the months of (February-May) at three locations. Two locations were for the control while the other was used for the synchronized. A total of 100 breeding cows of muturu cattle breed were used for the study. A multi-stage selection process was used on the basis of previous calving history. All animals selected were subjected to scanning with drumniski i-scan ultrasound scanner to ascertain pregnant and non-pregnant cows. All non-pregnant cows were further scanned to ascertain their ovaries for growing follicles hence forming our basis for cyclicity.100 breeding animals selected were randomly allocated to two groups of 50 animals each for the control and the synchronized. All animals in each group were managed on semi- intensive production system where the cows have access to pasture and water. The Fixed Time Artificial Insemination(FTAI) protocol was initiated on random days of the estrous cycle of the animal designated as day 0,7 and 10 respectively. The cows each received CIDR(controlled internal drug releasing device). On day 7, the CIDR was removed and 1ml of PGF analogue(cloprostenol) and 2ml of eCG was administered intramuscularly to each animal. The Kmacs and vasectomised bulls introduced into the herd helped in estrous detection. On day 10, second dose of GnRH was administered intramuscularly to each animal in the morning and 12hours later, all animals were inseminated using semen from NAPRI crossbred white Fulani bull. Results indicated that, 46 animals out of 50 retained their CIDR in the period of 7 days. 92% of the animals showed vaginal discharge at CIDR removal. The on-set of estrous was 31hrs after eCG and PGF administration and lasted for 54hrs. It took the animals a shorter period of time (32hrs) to come on heat after treatment. There was increase in the follicular size at each treatment(Day 0, Day 7 and Day 10) respectively. The animals had 100% ovulation rate and 46% had multiple ovulation which could be attributed to the effect of eCG on the follicles. The hormonal treatment increased the follicular size and as well induced the growth and development of pre-ovulatory follicles for ovulation unlike in the natural state where we had only 64% ovulation rate.

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International Journal of Environment, Agriculture and Biotechnology

The International Journal of Environment, Agriculture and Biotechnology (IJEAB) is an internation... see more