Genetic impact on external and internal egg quality traits of Vanaraja and Gramapriya birds and their crosses in Bihar

Abstract

Poultry farming is gaining strength in mitigating livelihood and nutritional security to the poor farmers which constitute 60% of the India’s population. Thus eggs of superior quality is prerequisite for profitable marketing and for hatchability too. The present study was conducted on two improved varieties, Vanaraja (dual purpose type) and Gramapriya (the layer type) chicken developed at PDP, Hyderabad and their crosses on random mating. The genetic groups taken were Gramapriya (male) x Gramapriya (female),Vanaraja(male) x Vanaraja(female), Gramapriya(male) x Vanaraja(female)and Vanaraja (male) x Gramapriya(female). 6 males and 30 females were taken from each genetic group and maintained separately under deep litter system with a mating ratio of 1 male : 5 females. To study the genetic effect on external and internal egg quality traits, a total of more than 50 eggs were collected at random from each of 4 genetic groups upto 28 weeks of age. The average shell thickness obtained to be ranged from 0.36 to 0.39 mm. The average albumen and yolk indices were found to be ranged from 7.396 to 8.656 and 41.749 to 43.888 respectively. The average shell weight and percentage of shell weight observed to be ranged from 4.147 to 5.627 g and 17.266 to 18.003% respectively.

Evaluation of reciprocal F1 crosses of Fayoumi with two exotic chicken breeds 2: additive and non-additive effects on egg quality traits

“…Most internal (YW, AW, and YH) and all external egg quality traits were significantly ( P < 0.001) different among the genotypes. Similarly, other authors (Al-Rawi and Amer 1972 ; Sola-Ojo and Ayorinde 2011 ; Khalil et al 2013 ; Sinha et al 2018 ; Hussen et al 2019 ; Udoh et al 2020 ; Wolde et al 2021 ) found significant differences among different genotypes for most egg quality traits.…”

“…These results generally suggest that crossbreeding could be used to enhance those traits. On the contrary, Sinha et al ( 2018 ) observed significantly higher EW, EL, EWD, ST, SW, AH, AW, and HU in the two purebreds compared with the crossbreds; thus, the traits did not improve as a result of crossbreeding. The differences among the findings in exploiting heterosis would be related to the variations in gene frequency among the parental breeds involved.…”

Sensory Characteristics, Nutritional Composition, and Quality of Eggs from Different Chickens

“…Also, significant differences in shell thickness might attribute to variations of resistance to breakage, contamination, bio-economic characteristics, and hatchability across breeds [19] [23] [58]. Furthermore, the variation in eggshell thickness might be greatly affected by selection and epigenetics across and within genotypes [22].…”

“…Egg quality is composed of those characteristics of an egg that affect its acceptability by consumers [21]. External egg quality is presented by its weight, shape, percentage of eggshell, and thickness which vary according to the species, breed, variety, feed, management, and environment as reported by the different researchers in different breeds [22]. Similarly, internal egg quality is presented by albumen quality and yolk quality which are responsible for the nutritional value of eggs of breeds and de-termine their acceptability to the consumers [23].…”

Insulin-like Growth Factor-1 Gene Polymorphism and Its Effect on Egg Quality Traits of Funaab Alpha, Kuroiler and Sasso Chicken Reared in Hot Humid Tropics

“…Similar to these exterior qualities, internal egg quality is represented by albumen quality and yolk quality, which are in charge of the nutritional content of breed-speci c eggs and decide whether or not consumers would accept them. (Zita et al, 2009;Sinha et al, 2017;Atsbaha et al, 2022). The qualities of an egg are what determine whether a consumer will accept it.…”