“…Improving the uterine involution as affected by bentonite administration was reflected in early resumption of postpartum ovarian activity (shortening interval to 1 st estrus), and reducing service period length and days open. Several reports indicated that postpartum lactating cows with early uterine involution had improved reproductive efficiency of Friesian and buffalo cows (Abdel-Khalek et al 2013, 2015. This improvement was in parallel with proper number of services per conception (1.4 services/conception).…”