Table 4. Correlations among AI success and drake sperm quality as assessed by microscopy or flow cytometry.

	Va	NMa	PMIa	MFa	M-Fb	M-EEMb	M-SERb	K-Fc	K-EEMc	K-SERc
	(r)	(r)	(r)	(r)	(r)	(r)	(r)	(r)	(r)	(r)
M	0.46**	−0.07	0.28†	0.32*	−0.43†	−0.07	−0.21	0.10	0.06	0.04
V		0.13	0.70**	0.70**	−0.02	−0.53*	0.34	−0.01	0.16	−0.09
NM			0.32*	0.28†	0.15	−0.18	0.19	0.19	−0.08	0.11
PMI				0.59**	0.18	−0.54*	0.44†	0.12	−0.01	0.09
MF					0.02	−0.34	0.25	0.36	−0.55†	0.48

^an=41

^bn=18

^cn=12

^**P<0.01

^*P<0.05

^†P<0.1.

M: sperm motility, V: eosin-nigrosin staining - sperm viability, NM: eosin-nigrosin staining - normal morphology, PMI: flow cytometry - plasma membrane integrity, MF: flow cytometry - mitochondrial function, M-F: percent apparent egg fertility of AI of Muscovy ducks, M-EEM: percent early embryo mortality of fertile eggs by AI of Muscovy ducks, M-SER: embryo survival rate of total eggs by AI of Muscovy ducks. K-F: percent apparent egg fertility by AI of Kaiya ducks, K-EEM: percent early embryo mortality of fertile eggs by AI of Kaiya ducks, K-SER: embryo survival rate of total eggs by AI of Kaiya ducks.