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Cetyltrimethylammonium bromide (CTAB) at a concentration of 10 mg/l in a citrate buffer partially protected sperm against the effects of cold shock treatment. CT AB concentrations of 10 and 20 mg/l also increased in vitro sperm livability when semen was diluted in Caprogen and incubated at 37C (50 h v. 60 and 57 h). Concentrations of CTAB exceeding 50 mg/l reduced in vitro sperm livability. The addition of catalase (4 5 mgfl) to Caprogen produced greater increases in in vitro sperm livability (50 h v. 110 h), but did not eliminate the toxic effect of the higher CTAB concentrations. The addition of CTAB (10 mg/l) to the Caprogen-catalase diluent significantly increased the non-return rate of the diluted semen in only one of four large-scale field trials and did not alter non-return rates with deep-frozen semen.

Effects of Low Concentrations of Cetyltrimethylammonium Bromide on Diluted Bovine Spermatozoa