Abstract
This study was aimed at investigating the use of seminal plasma protein concentration to predict fertility and hatchability in the domestic fowl. Forty cocks with acceptable sperm motility and morphology were used and the seminal plasma protein concentration determined by the Biuret method. The result revealed a negative significant correlation between the seminal plasma protein concentration with sperm motility (r = -0.5920, p<0.05), Y = -0.3144X<sup>2</sup>+2.1578X+74.324, R<sup>2</sup> = 0.3506 (p<0.05). A significant positive correlation with percentage dead spermatozoa r = 0.9743 (p<0.01), R<sup>2</sup> = 0.9493, p<0.01), percent abnormal spermatozoa, r = 0.8425, p<0.01), R<sup>2</sup> = 0.7098 (p<0.01), Y = 0.357X<sup>2</sup>+1.5364X+9.1886. Egg fertility and Hatchability were negative but significantly correlated with seminal plasma protein concentration r = -0.6302 (p<0.01) vs r = -0.8438 (p<0.01) and Y = 0.8977X<sup>2</sup>-5.8289X+81.628 vs Y = -0.2391X<sup>2</sup>+3.3871X+60.771, respectively. There was low correlation with the quantitative semen characteristics. Prediction of Y<sub>max</sub> from Seminal plasma protein concentration (X) showed that the best semen quality, highest percent fertility and hatchability would be obtained when the concentration of seminal plasma protein is >3.00 g/100 mL but <6.00 g/100 mL. It was concluded that seminal plasma protein concentration could be used as a biomarker for prediction of fertility and hatchability in the domestic fowl.
Highlights
Semen samples with optimal quality that will improve conception rates can be used as the basis of selection of high fertility sires
Thurston et al (1992) reported infertility of unknown origin and poor hatchability in flocks of yearling Large White turkeys. They maintained that males with high seminal protein equal to or greater than 6 g/100 mL were responsible for significant reduction in fertility and hatchability in the flock and reported no correlation between seminal plasma protein and fertility or hatchability when the seminal plasma protein concentration was less than 6 g/100 mL
Proteins of the seminal plasma have an ample panorama of action and some appear responsible for establishing fertility including maintaining the stability of the membrane up to the process of capacitation as they pass through the male and female reproductive tracts. (Therien and Manjunath, 1997) In roosters, the epididymal fluid might be the source of sperm maturation proteins (Al-Aghbari, 1993) and may play a
Summary
Semen samples with optimal quality that will improve conception rates can be used as the basis of selection of high fertility sires. In the bovine species as well as in other mammals, freshly ejaculated sperm are not capable of fertilizing eggs They must first undergo capacitation and the acrosome reaction during their transit through the female reproductive tract to become fully competent to fertilize an ovum (Therien and Manjunath, 1997). Both processes, as well as, sperm motility are regulated by seminal plasma proteins (Mogielnicka and Kordan, 2011). Proteins of the seminal plasma have an ample panorama of action and some appear responsible for establishing fertility including maintaining the stability of the membrane up to the process of capacitation as they pass through the male and female reproductive tracts. (Therien and Manjunath, 1997) In roosters, the epididymal fluid might be the source of sperm maturation proteins (Al-Aghbari, 1993) and may play a
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