The Effect of Amylase, Catalase, and a Decapacitating Preparation on Fertility of Bull Semen Diluted in Ambient Temperature Extender

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Abstract
Four ejaculates from each of three bulls were diluted in four ambient temperature extenders: (1) Caprogen; (2) Caprogen containing 8 fl-gfml ",�amylase; (3) Caprogen containing 4�5 fl-gfml catalase; and (4) Caprogen containing amylase and catalase. The conception rate (49�day % non-return rate) for each extender was 64�63; 63�37; 64�58; and 66�09% respectively. Whereas the addition of catalase significantly increased conception rates (P = 0�025), the addition of amylase did not (P > 0�25). There was a significant enzyme interaction, suggesting that any beneficial effect attributable to the amylolytic preparation was only exerted in the presence of catalase (P < 0�025). The significant improvement in in vitro livability at 37�C by the addition of amylase in the absence of catalase was minor compared to the improvement in livability obtained by the addition of catalase

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