Effect of laying period and duck origin on egg characteristics

Abstract

Abstract. The study was carried out on eggs of two-year-old Orpington ducks (O1) and crossbred ducks Khaki Campbell×Orpington (KhO). Eggs for analysis were collected in the 6th and the 22nd week of egg laying. The eggs of KhO ducks had greater weight (72.45 g), specific gravity (1.083 g/cm3) and a thicker shell (0.67 mm) in comparison to eggs of the O1 population (70.64 g, 1.081 g/cm3 and 0.65 mm, respectively). Eggshell content accounted for 9.53% and 7.85% of egg weight in KhO and O1 ducks, respectively. Eggs of KhO ducks were characterized by a lower egg white index (0.07), yolk content (39.48%) and protein content of egg white as well as lower L* parameter of yolk than eggs of O1 ducks. In KhO eggs, yolk lipids contained more C 18:1 cis-9, C 20:4, C 22:6 and C 20:5 and less α C 18:3 and C 18:1 trans-11 fatty acids than those of O1 eggs. The eggs laid in the 6th week had greater weight (by 3.61 g), specific gravity (by 0.01 g/cm3), egg white content (by 2.26%), eggshell thickness (by 0.04 mm), strength (by 10.70 N) and deformation (by 0.90%), and lower yolk content (by 2.34%) than the eggs laid in the 22nd week of laying. Furthermore, the eggs laid at the beginning of the second laying period were characterized by higher protein content of egg white and yolk (by 0.26% and 0.49% respectively) and pH value of egg white and yolk, lower lightness of yolk (L*), higher unsaturated fatty acids (UFA) content of yolk (especially polyunsaturated fatty acids – PUFA, by 2.53%), and lower saturated fatty acids (SFA) content of yolk (by 3.10%) and total cholesterol content (by 2.38%).

Production benefits of the crossbreeding of indigenous and non-indigenous ducks—growing and laying period body weight and production performance

“…Egg weight observed in the present study was lower than the various reports (Eswaran et al 1985;Nageswar et al 2005;Padhi et al 2009b) in indigenous duck, Khaki Campbell and their crosses at 40th week of age and higher than the report of Dutta et al (1995) in Khaki Campbell at 40th week of age and Padhi et al (2009a) at 60th week of age in Desi, Khaki Campbell and their crosses. Egg weights obtained in the present study were comparable to the report of Gonzalez and Marta (1980) for Khaki Campbell and Okruszek et al (2006) for crosses. Overall egg weights of crosses are better than the purebreds indicating the crossbred for commercial exploitation.…”

The comparison of quality characteristics of Pekin duck and Cherry Valley duck eggs from free-range raising system

“…Valley duck eggs. Similar values for YI of Pekin duck eggs was reported by Okruszek et al (2006), Kokoszynski et al (2007), Okruszek et al (2008), Onbasilar et al (2011) and Kavitha et al (2017). According to significantly higher albumen index, Haugh unit value was also significantly higher (P<0.01) at Pekin duck eggs in comparison to Cherry Valley duck eggs (84.84 vs 71.15).…”

“…The albumen index of Pekin duck eggs observed in this study (0.11) was significantly higher (P<0.01) than AI of Cherry Valley duck eggs (0.07), and also higher than AI of Pekin duck eggs as 0.06-0.08 reported by Onbasilar et al (2011), 0.06-0.07 reported by Okruszek et al (2008) and 0.07-0.09 reported by Okruszek et al (2006), but lower than AI of Pekin duck eggs as 0.13 reported by Kavitha et al (2017). The same value of yolk index was obtained in this study (0.40) for Pekin duck and Cherry…”

Comparison of Meat Performance of Pekin Ducks From Two Conservative Flocks

“…This programme contains the history of the breed, justifies the need to protect individual flocks of ducks, and specifies flock standards, programme objectives, the scope of productive value evaluation and breeding methods used [15]. In recent years, ducks raised at the Waterfowl Station in Dworzyska have received considerable study [13,14,19,23,24]. P11, P22, P44 and P55 ducks (Duck Breeding Centre in Lińsk) were the subject of few studies many years ago.…”