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El-Zarkouny, S.Z., Ghobashy, H., Nour El-Din, A.N.M., Abdel-Gauad, E.I. and Hassan, G.A. (2007) Lambing and Embryonic Mortality Rates in Awassi and Barki Ewes and Their Crosses throughout Three Different Mating Seasons in the West Coastal Region of Egypt. Alexandria Journal of Agricultural Research, 52, 15-24.

has been cited by the following article:

• TITLE: Impact of Quebracho Tannins Supplementation on Productive and Reproductive Efficiency of Dairy Cows

  AUTHORS: Marwa F. A. Attia, Adel N. M. Nour El-Din, Samir Z. El-Zarkouny, Hani M. El-Zaiat, Moustafa M. Zeitoun, Sobhy M. A. Sallam

  KEYWORDS: Quebracho Tannin, Feed Intake, Milk Yield, Follicular Dynamics, Conception Rate

  JOURNAL NAME: Open Journal of Animal Sciences, Vol.6 No.4, September 30, 2016

  ABSTRACT: This study was conducted to investigate effects of supplementing two doses of quebracho tannins (QT; 100 or 200 g/cow/d; QT100 or QT200) pre and post parturition to thirty Holstein dairy cows on Dry Matter Intake (DMI), milk yield and composition, blood metabolites and reproductive performance for 12 weeks. There were no significant changes in DMI due to QT at transition period of dairy cows. QT supplementation at either level decreased (P 0.05) the total number of ovarian follicles, number of large follicles, diameter of largest follicle, number of small follicles, number and diameter of corpus luteum, and progesterone concentration. The inclusion of QT increased days open and number of services per conception, which consequently decreased conception rate, compared to the control cows. QT100 decreased (P