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OPTIMIZATION OF THE PROTOCOL FOR CRYOPRESERVATION OF ARABIAN STALLION SPERMATOZOA: EFFECTS OF CENTRIFUGATION, SEMEN EXTENDERS AND CRYOPROTECTANTS, Ghallab, AM, Abou-Ahmed Mostafa M., Fadl Aya M., El-Badry Diya A., Shahat Abdallah M., and Moawad Adel R. , CryoLetters, Volume 40 (2),, Issue (2019), p.129-138 , (2019)
Impact of supplementation of semen extender with antioxidants on the quality of chilled or cryopreserved Arabian stallion spermatozoa., Ghallab, AbdelRaouf M., Shahat Abdallah M., Fadl Aya M., Ayoub Mohamed M., and Moawad Adel R. , Cryobiology, 2017 Dec, Volume 79, p.14-20, (2017) Abstract

The aim of the present study was to evaluate the effects of supplementation of semen extender with various non-enzymatic antioxidants on the quality of cooled or cryopreserved Arabian stallion spermatozoa. Semen collected from four pure Arabian stallions was centrifuged at 600g for 15 min. Spermatozoa were then diluted in INRA-82 extender supplemented with bovine serum albumin (BSA; 0, 10, 15 and 20 mg/mL) or trehalose (0, 75, 100 and 150 mM) or zinc sulphate (0, 100, 150 and 200 μM). The diluted semen was then either cooled at 5 °C or cryopreserved in 0.5-ml plastic straws. After cooling or thawing, sperm motility, viability, sperm abnormalities, viability index, and plasma membrane integrity were evaluated. The results showed that supplementation of semen extender with 150 mM trehalose or with 200 μM zinc sulphate significantly (P < 0.05) improved motility, viability, sperm membrane integrity and acrosome status in Arabian stallion spermatozoa after cooling or after freezing and thawing compared with controls (non-supplemented media) or with those supplemented with other concentrations of trehalose or zinc sulphate. Supplementation of semen extender with BSA did not improve sperm motility or cryosurvival of Arabian stallion spermatozoa after cooling or after freezing and thawing. In conclusion, supplementation of semen extender with non-enzymatic antioxidants (trehalose or zinc sulphate) improved the quality of chilled and frozen/thawed Arabian stallion spermatozoa. The most beneficial effects occur when semen diluent was supplemented with 150 mM trehalose or 200 μM zinc sulphate.

The effect of sequence of ejaculation on frequency of sperm abnormalities in bulls., Ghallab, AM, Ghallab AM, and Elwishy AB , The British veterinary journal, 1987 Jan-Feb, Volume 143, Issue 1, p.70-4, (1987) Abstract
Effects of repetitive norgestomet treatments on pregnancy rates in cyclic and anestrous beef heifers., Ghallab, AM, Ott R. S., Cmarik G. F., Kesler D. J., Faulkner D. B., and Hixon J. E. , Theriogenology, 1984 Jul, Volume 22, Issue 1, p.67-74, (1984) Abstract

Sixty-eight 12- to 14-month-old crossbred beef heifers averaging 285 kg were assigned at random to treated (n = 35) and control (n = 33) groups to evaluate the use of repetitive norgestomet treatments. Treated heifers received an ear implant containing 6 mg norgestomet on two occasions 16 days apart. Injections of 3 mg norgestomet and 5 mg estradiol valerate (EV) were given intramuscularly the same day as first implantation (Syncro-Mate-B). Implants were removed after eight days. Four bulls were then placed in each of two pastures containing half of the treated and half of the control heifers for 24 days after the time of the first implant removal. Progesterone concentrations from blood samples collected prior to the first treatment were used to determine reproductive status. The overall pregnancy rate 64 days after first implant removal for treated anestrous heifers (61%; 14 23 ) was similar (p > 0.25) to untreated (73%; 11 15 ) and treated (75%; 9 12 ) cyclic heifers, but higher (p < 0.1) than for untreated anestrous heifers (33%; 6 18 ). This treatment advantage resulted from an increased (p < 0.01) pregnancy rate after the second implant removal. In summary, repetitive norgestomet treatments enhanced pregnancy rate in anestrous heifers within a 24-day breeding season.

Effect of Dietary zinc or Selenium supplementation on some reproductive hormones level in male Baladi Goats, G.A.El-Sisy, A.M.A.Abdel-Razek, A.A.Younis, A.M.ghallab, and M.M.S.Abdou , Global Veterinaria, Volume 2 92), Issue 2008, p.46-50, (2008)
Study on the Discrimination of Possible Error Sources That Might Affect the Quality of Volatile Organic Compounds Signature in Dairy Cattle Using an Electronic Nose, Ali, Asmaa S., Jacinto Joana G. P., Mϋnchemyer Wolf, Andreas Walte, Björn Kuhla, Gentile Arcangelo, Abdu Mohamed S., Kamel Mervat M., and Ghallab Abdelrauf Morsy , veterinary sciences, Volume 9, p.461, (2022)
Estrus Detection in a Dairy Herd Using an Electronic Nose by Direct Sampling on the Perineal Region, Ali, Asmaa S., Jacinto Joana G. P., Mϋnchemyer Wolf, Andreas Walte, Gentile Arcangelo, Formigoni Andrea, Mammi Ludovica M. E., Bajcsy Árpád Csaba, Abdu Mohamed S., Kamel Mervat M., et al. , veterinary sciences, Volume 9, p.688, (2022)