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Table 6. In vitro penetration ability of boar frozen spermatozoa thawed in BTS medium with or without the addition of reduced glutathione (GSH)^* ${dagger}$

	N Oocytes	Penetration Rate (%)	Sperm per Penetrated Oocyte ${ddagger}$	Decondensed Sperm (%)

Thawing media
Control	307	35.18 ± 2.73^a	1.34 ± 0.06^a	18.52 ± 3.76^a
1 mM GSH	308	51.94 ± 2.85^b	1.66 ± 0.07^b	24.20 ± 3.43^b
5 mM GSH	285	58.95 ± 2.92^b	1.92 ± 0.08^c	34.52 ± 3.68^c
Source variation P values
GSH		0.000	0.000	0.002
Batch		0.000	0.001	0.000
Interaction		0.026	0.039	0.831

*BTS indicates Beltsville Thawing Solution extender; N, number of immature oocyte inseminated.
${dagger}$ Numbers with different superscript letters differ (P < .05).
${ddagger}$ Related to penetrated oocytes.

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