The mean values of the egg quality traits revealed an apparent increase for egg length 4.05 4.65 cm and egg breadth 2.47 2.66 cm with a corresponding overall mean data 4.38 cm for egg length and 2.56 cm for egg breadth; however, egg shape index recorded decrease from 61.87 to 57.19 with a corresponding overall mean of 58.92.
Because we were unable to assign an individual egg size to each neonate, only the mean egg size of the corresponding clutch could be analyzed as a factor of juvenile body length or survival; intra-clutch egg size variation was not taken into account.
The present research was designed to examine heritability estimates of egg length, egg breadth and egg shape index under the influence of age variance for Bovan Nera Black laying chicken sat 25, 51, 72 weeks and overall mean ages of the bird.
Data were collected on egg production traits for egg length, egg breadth and egg shape index.
Mean egg densities was 1.34 ± 0.16 g/cm3 and 1.20 ± 0.07 g/cm3 for normal and large eggs, respectively.
Egg length averaged 0.82 ± 0.01 mm total length (TL) and ranged from 0.75 to 0.90 mm.
Each experimental tank was stocked with 1 kg of eggs, and the mean number of eggs (1,400,000) was estimated, by measuring the mean egg diameter, with a mean initial rearing density of 88 larvae l−1.
As expected, the embryo developing under uniform temperature had a lower intensity of Bcd at 40% egg length than at 5% egg length (p<.00000001).
Additionally, individual nuclei at different positions in the embryo (15, 50, and 85% egg length) were tracked as a function of egg length over time (Figure 2C).
Reproductive investment flexibility is genetically and positively correlated with mean reproductive investment and mean egg size.
