Comparison of assessment of fowl sperm viability by eosin-nigrosin and dual fluorescence (SYBR-14/PI).
The kinetics of fowl sperm viability/mortality following short-term and long-term in vitro storage were studied using 2 different staining methods: eosin/nigrosin (observed under light microscopy) and SYBR-14/PI (dual fluorescence). Based on data obtained at 0, 30 min and at 2, 4 and 24 h (T0, T30, T2, T4, and T24) after in vitro storage (4 degrees C, agitated) of fresh or frozen-thawed semen, the dual association SYBR-14/PI was more effective than eosin/nigrosin (P < 0.05) staining for the detection of sperm viability/mortality at early stages (30 min) in nonfrozen ejaculates stored above 0 degree C. In cryopreserved preparations, the 2 techniques were comparable for assessing viable spermatozoa immediately after thawing, but higher percentages (P < 0.05) of nonviable spermatozoa were detected by the SYBR-14/PI procedure for up to 4 h of in vitro storage post thawing (4 degrees C, agitated). Finally, comparable results were observed between the 2 techniques 24 h after beginning in vitro storage post thawing. It is concluded that the dual association SYBR-14/PI procedure is more effective (or, at least, more rapid) than eosin/nigrosin staining for the assessment of sperm viability/mortality in both fresh and cryopreserved samples of fowl semen. However, in the latter case, the thawing stage needs to be followed by a period of in vitro storage lasting at least 4 h to allow for easier discrimination between viable and nonviable populations of spermatozoa.
Chalah
T
T
INRA, Station de Recherches Avicoles, Nouzilly, France.
Brillard
J P
JP
D000814:Aniline Compounds; D000818:Animals; D002470:Cell Survival; D004396:Coloring Agents; D015925:Cryopreservation; D004801:Eosine Yellowish-(YS); D005453:Fluorescence; D005456:Fluorescent Dyes; D008297:Male; D011200:Poultry / Q000502:physiology*; D012662:Semen Preservation; D013094:Spermatozoa / Q000502:physiology*; D013194:Staining and Labeling
D000814:Aniline Compounds; D004396:Coloring Agents; D005456:Fluorescent Dyes; C002712:nigrosin; D004801:Eosine Yellowish-(YS)