The study was conducted to know the level of Malondialdehyde (MDA) in seminal plasma of cryopreserved semen of Holstein bulls after addition of zinc sulphate, cysteine, PGF2α and their combination in vitro.
Semen was collected from 7 Holstein bulls, presented in Artificial insemination Center which belonged to the Directorate of Animal Resources/ Ministry of Agriculture at Abu-Graib at the west of Baghdad. Pooled semen were diluted with Tris- based extender and divided into five parts. The first part (T1) serve as a control (without addition). The 2nd part (T2) added to it zinc sulphate (0,576 mmol/ ml). The 3rd part (T3) added to it cysteine (5 mmol/ ml). The 4th part (T4) added to it PGF2α (37.5 pg/ ml). while the 5th part added to it a combination of previous substances at the same concentration. The packed in straws and cryopreserved in a liquid nitrogen and after 30, 60 and 90 days. Seminal plasma when isolated to measure the level of MDA.
The results showed a significant decrease (P>0.01) in MDA level in the combination treated group (zinc, cysteine and PGF2α) 0.450 ± 0.11 (mmol/ ml) as compared with control group 1.25 ± 0.38 (mmol/ ml), zinc 1.06 ± 0.12 (mmol/ ml), cysteine 0.968 ± 0.17 (mmol/ ml) and PGF2α group 0.867 ± 0.12 (mmol/ ml) respectively.
It was concluded from this study that addition of a combination of zinc, cysteine and PGF2α to the Holstein bull semen could decrease the level of MDA which might be due to the synergistic effect of these substances.
Key words: MDA, Zinc, Cysteine, PGF2α, Holstein bulls, semen, cryopreservation.
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