Seasonal variation of semen quality among the three genotypes of native chicken

Abstract

The study, conducted at the Bangladesh Livestock Research Institute, aimed to assess semen quality and characteristics in three types of indigenous cocks and explore seasonal variations. Ninety bird samples from three genotypes, namely non-descript Deshi (ND), Hilly (HI), and Naked Neck (NN), were used in this research. A total of 548 semen samples were collected to evaluate the color, volume, consistency, and transparency of semen in different seasons. Semen collection was performed using an abdominal massage technique, and volume was measured with a tuberculin syringe. For determining microscopic physical and morphological characteristics, computer-assisted sperm analysis (CASA) software was used. Results showed that among three types of indigenous cocks, semen quality differed (p < 0.001) from season to season. Semen quality was comparatively good for ND in the autumn season, for HI in the summer season, and for NN in the spring season. The highest semen volume (0.318 ± 0.010 ml) was recorded in the summer season, and the lowest semen volume (0.218 ± 0.008 ml) was recorded in the spring season. Genotype had a significant (p < 0.01) effect on semen volume, and the effect of semen and genotype interaction on semen volume was non-significant (p > 0.05). The sperm concentration was higher in NN compared to ND and HI. The percentages of static, bent tail, coiled tail, DMR, distal droplet, and proximal droplet were comparatively higher in the HI and NN genotypes. The color, consistency, and volume of semen were affected by genotype and season.