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Qadeer, S; Khan, M A; Ansari, M S; Rakha, B A; Ejaz, R; Husna, A U; Azam, A; Ullah, N; Walker, V K; Akhter, S
Cryo-Letters, 2017 Jan/Feb, Letnik: 38, Številka: 1Journal Article
Semen from the Nili-Ravi buffalo bull, Bubalus bubalis, shows poor survival after freeze storage compared to bovine (Bos taurus and Bos indicus) semen. Freeze-susceptibility distinctions in these two genera have been attributed to differences in sperm membranes. We measured the impact of protein preparations derived from a frost-resistant perennial grass, Lolium perenne, with ice recrystallization inhibition activity on the low temperature storage of B. bubalis semen. When the L. perenne preparations (0.1, 1, 10 µg/mL) were added to buffalo semen 2 ejaculates per bull (N=3) per replicate (r=3) in Tris-citrate extender (50×10 sperm mL ), there was no impact on semen quality, as measured by sperm motility and plasma membrane integrity, after storage at 4 degree C (P>0.05). However, when semen supplemented with the grass proteins (0.1 and 1 µg mL ) was evaluated after freezing and storage in liquid nitrogen for 24 h, post-thaw sperm progressive motility and plasma membrane integrity was higher (P<0.05) than in control samples. Post-thaw sperm viability and sperm acrosome integrity was similar (P > 0.05) to controls. The improvement in cryopreserved buffalo sperm progressive motility and plasma membrane integrity suggests that the use of these easily-made preparations may improve fertility after cryopreservation and offers the prospect of improved conception rates after artificial insemination with cryopreservation.
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