الفهرس 
Introduction
Cervical involutionOnly 14 pages are availabe for public view
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Abstract
This study was carried out at Mehallet Mousa Experimental Station, belonging to Animal Production Research Institute to evaluate the effects of methergine or oxytocin administration at 0 or 24 hours after calving on uterine involution and the pregnancy rate of buffalo cows.
About 20 multiparous Egyptian buffalo cows with normal parturition having (400-650 kg) live body weight, (2-7) parities and (2.5-3.5) body condition score were used in this study. Animals were divided into five groups (n=4/each).
Animals in the 1st group were i.m. injected with saline solution at calving and 24 h post-calving (control). Each animal in the 2nd and 3rd groups (G2 and G3) received an i.m. injection of 3 mg methergine (MET) at 0 and 24 h post-calving, respectively. While, each animal in the 4th and 5th groups received an i.m. injection of 100 IU oxytocin (OXY) at 0 and 24 h post-calving, respectively.
Throughout post-partum period, all buffaloes were hand milked twice daily. Routine examination of the genitalia per rectum was conducted twice weekly to judge the uterine involution manually by fingers.
Ultrasonography was used immediately after rectal palpation to determine gravid and non-gravid uterine horns and cervical diameter. Uterine involution was considered complete when both horns were nearly symmetrical. Pregnancy was diagnosed by rectal palpation on day 45 post-insemination and conception rate was recorded.
Resumption of ovarian activity and cyclicity were assessed by observation of animals, examination of ovaries per rectum, ultrasonography and plasma progesterone profile
In conclusion, treatment of buffalo cows immediately at calving with oxytocin (100 IU/ head) with the purpose of stimulating uterine involution had pronounced effect on the duration of days open, number of services per conception and conception rate, without marked effects on the shrinkage of the uterine horns and closure of the cervix during post-partum period compared with that seen in the control.