Indicators of semen quality of roosters of three parental layer lines and specific conductivity of the semen
2002
Machal, L. | Krivanek, I. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Agronomicka Fakulta)
Relations between semen quality and its specific conductivity was determined in 90 clinically healthy roosters of three parental lines (BPR - 04, RIW - 06 and RIR - 05) in a breeding flock of the Moravia laying hybrids. Semen volume, concentration and motility of spermatozoa in the ejaculate were measured at the age of 143, 205 and 240 days, while the semen specific conductivity was evaluated at the age of 205 and 240 days. The average volume of the ejaculate of all three parental lines ranged between 0.20 cube cm and 0.62 cube cm; the average total number of spermatozoa in the ejaculate (TNS) varied from 0.16 x 10**9 to 0.59 x 10**9; the average total number of motile spermatozoa (TNMS) varied from 0.09 x 10**9 to 0.51 x 10**9. All these three parameters increased with the age. The lowest average TNMS was reported in cocks of the RIR - 05 universal paternal line and the highest in cocks of the BPR - 04 paternal line. The average specific conductivity ranged between 0.84 S/m and 1.02 S/m. The lowest average specific conductivity was discovered in the ejaculates of cocks with the lowest number of motile sperms (line RIW -06, 205 days of age, i.e. 1.02 S/m). Negative correlations (from -0.15 to -0.45) were found between sperm concentration and motility and the specific conductivity.
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