Hatching Characteristics and Growth Performance of Eggs with Different Egg Shapes

Abstract

This study was carried out to identify the effect of the egg shape index on the hatchability, performance, and carcass yield of Japanese quails (Coturnix coturnix Japonica). Eggs were incubated in three groups, according to three different egg shape index ( , and the results showed that females were heavier than males (p<0.05; p<0.01; p<0.001, respectively).The effect of egg shape index on slaughter weight (p<0.05), left leg weight (p<0.05), liver weight (p<0.01) and liver rate (p<0.01) was significant. Females were heavier at slaughter than males in the egg shape index groups SI-I (p<0.05), SI-II (p<0.05), and SI-III (p>0.05) (female/male: 296.87/283.80, 287.95/278.00 and 283.86/278.10 g, respectively). Males presented higher carcass yield in SI-I (p>0.05), SI-II (p<0.01) and SI-III (p<0.05) (female/male: 74.40/75.92, 74.50/76.44 and 74.80/76.42%) groups than females. Egg shape index had no effect on initial egg weight (IEW), shell blunt end weight (SBW), chick weight, shank length, growth performance or carcass traits, but egg shape indexwas correlated with egg length, egg width, and hatchability of fertile eggs (p<0.05).

Assessment of hatchability of Tunisian local turkey compared to commercial turkey and its relationships with physical egg traits

“…Unhatched eggs were recorded in shape index form 69.24%. This result is in agreement with the findings of Alasahan and Copur (2016).In contrast to previous research suggesting that the egg shape index does not affect hatchability (Sari et al, 2010;Lotfi et al, 2011;Taha, 2011).…”

Selected Traits of Hatched and Unhatched Eggs and Growth Performance of Yellow Japanese Quails

“…Lourens (2001) reported that the average eggshell temperature of chick is 37.8ºC, on average, which may present deviations above 4ºC, depending on the position of the egg in the setter and the age of the embryo. In their study on Japanese quail eggs, Alasahan et al (2016) reported an eggshell temperature on the day of egg transfer of37.44ºC, on average, with 37.62ºC in hatched eggs and 37.14ºCin unhatched eggs. While the eggshell temperatures determined in the present study were higher than those reported by Alasahan et al (2016), it was observed that the average value and the values of the hatched and unhatched eggs showed similar alterations and were lowest in unhatched eggs.…”

“…In their study on Japanese quail eggs, Alasahan et al (2016) reported an eggshell temperature on the day of egg transfer of37.44ºC, on average, with 37.62ºC in hatched eggs and 37.14ºCin unhatched eggs. While the eggshell temperatures determined in the present study were higher than those reported by Alasahan et al (2016), it was observed that the average value and the values of the hatched and unhatched eggs showed similar alterations and were lowest in unhatched eggs. Internal egg temperature of changes as the embryo grows during the incubation period as metabolic heat production increases (French 2009).…”

“…Turkey eggs which eggshells presented micro-cracks, low weight, poor pigmentation, and rough surface had higher weight loss throughout the incubation period, higher embryonic mortality rate in the mid and late phases of incubation, and lower hatchability than eggs with intact and normal shells (Mróz et al, 2007). Some literature reports suggest that internal and external egg quality traits, such as the weight of the albumen, yolk and eggshell, and eggshell thickness affect hatchability (Alkan et al, 2008;Lotfi et al, 2011;Caglayan et al, 2014;Alasahan & Copur, 2016;Iqbal et al, 2016;Oleforuh-Okoleh, 2016). Skewes et al (1988) attributed the higher mortality rate of smaller compared with larger quails to the smaller size of the egg yolk.…”

Performances de croissance, de ponte et qualité de l’œuf chez la caille Japonaise (Coturnix coturnix japonica)

“…Les femelles pèsent significativement plus que les mâles (+28g, P<0,001). Cette supériorité ne se manifeste généralement qu'à partir de la 2ème semaine (Devi et al, 2010;Berrama et al, 2011;Rathert et al, 2017), quelquefois à la 4ème semaine d'âge (Ojo et al, 2014;Victoria et al, 2014;Alasahan et Copur, 2016). Le dimorphisme sexuel a également été observé pour les paramètres de taille et de conformation, liés notamment à la longueur (+0,39cm, P<0,05), l'envergure (+1,55cm, P<0,001) et la largeur thoracique (+0,23cm, P<0,01).…”