For the ISA Brown pullets, egg weight, egg length, egg width, albumen weight, yolk length and yolk height reduced significantly across the group while for the YENLC, egg weight, egg length, egg width, albumen weight, yolk length, yolk height, shell weight, albumen height and yolk height decreased significantly (p<0.05) across the group (Table 2).
From Table 3, it was observed that all the egg parameters of ISA Brown pullets were significantly higher than that of YENLC. For all the egg parameters, the values decreased significantly (p<0.05) across the group.
The body weights of Isa Brown pullets at weeks 8 and 24 were significantly (p<0.05) higher than that of YENLC but YENLC consumed more feeds (p<0.05) than the Isa Brown pullets.
The egg number, FCR and HDP of Isa Brown were significantly higher (p<0.05) than that of YENLC (Table 4).
Table 4 further showed at week 8 that birds fed 5% and 10% MOSM had significantly (p<0.05) higher body weight when compared with the control (0% MOSM) but at week 24, birds fed 5% and 15% MOSM had significantly (p<0.05) higher body weights when compared with the control 0% MOSM) and 10% MOSM. Egg number and hen day production decreased significantly (p<0.05) with increasing levels of MOSM. Feed intake up to 10% MOSM was significantly higher (p<0.05) than 15% MOSM. FCR of birds in the control (0% MOSM) and 5% MOSM were significantly (p<0.05) better than 10% and 15% MOSM.
Table 5 further revealed that at week 24, body weights of YENLC also increased significantly with increasing levels of MOSM while in Isa Brown hens, birds fed 5% MOSM had significantly higher (p<0.05) body weights compared to the control (0% MOSM) and 10% MOSM but feeding MOSM at 15% inclusion significantly (p<0.05) depressed the growth.
However, for both genotypes, egg number and hen day production significantly (p<0.05) decreased with increasing levels of MOSM (Table 5). Table 5 also showed that feed intake also decreased significantly (p<0.05) with increasing levels of MOSM for YENLC while in Isa Brown, birds fed 10% MOSM had significantly higher (p<0.05) feed intake compared to 0% MOSM, 5% MOSM and 15% MOSM that were similar (p>0.05).
In YENLC, birds fed 5% MOSM and 10% MOSM had significantly better (p<0.05) FCR compared to the control (0% MOSM) and 15% MOSM while for the Isa Brown hens, FCR was significantly better (p<0.05) at 0% MOSM and 5% MOSM (Table 5).
The report agreed with the findings of
Hrncar et al. (2014), who studied the effect of genotype on egg quality characteristics of Japanese quails (
Coturnix japonica), they observed that egg weight was significantly affected by the quail type. Also, the egg shape index was significantly influenced by genotypes.
Also, in the study of
Adeosun (2004) on the effects of genotype of dam on egg quality characteristics of chickens, the results showed that egg weight, length and width were highly significantly by the genotypes of the chickens but on the contrary, the internal egg parameters indicated that albumen height, albumen pH, yolk weight, egg shell, thickness and yolk colour were not significantly affected by genotype.
In a related study,
Olugbemi et al. (2010) found that
Moringa oleifera leaf (MOL) can be safely included in layer diets up to 10% without negatively affecting productivity.
Ebenebe et al. (2013) concluded from their study on the effect of various levels of MOL in the diet that inclusion of MOL at lower levels improved egg production and egg quality but higher levels of inclusion resulted in lower productivity and poorer egg quality indices of Isa Brown Breed of layers.
This finding is in agreement with the findings of
Bhatnagar et al. (1996) who reported that eggs characteristics of commercial layer ISA Brown were not significantly affected by the incorporation of
Leuceana leucocephala leaf in the diet. The present result is also in close agreement with the finding of
Kakengi et al. (2007) who recorded heavier egg with 5% of MOL in the diet as compared to 10% inclusion. Generally, many authors
(Olugbemi et al., 2010, Abou-Elezz et al., 2011 and
Kakengi et al., 2007) agreed that the use of MOL up to 10% had no negative effect on the productive performance of laying hens, but levels above that (>10%) may produce adverse effects.
The study was also in agreement with the report of
Raphael et al. (2015) who studied the effects of substituting soybean with
Moringa oleifera meal in diets on laying and eggs quality characteristics of KABIR chickens, they reported that egg weight, egg width, yolk weight and yolk diameter significantly decreased with increasing levels of MOL in the diets while egg length, yolk length, yolk index and shell weight and thickness were not significantly affected by MOL in the rations. The result of this study contradicted with the report of
Wei et al. (2016) who reported higher albumen heights in laying hens fed 10%
Moringa oleifera leaf.
Egg weight is among the most important parameters not only for consumers but for egg producers (
Genchev, 2012). The result was in agreement with the report of
Hrncar et al.(2014), they observed that genotype significantly affected yolk weight and yolk index for quail. However, genotype did not significantly affect Haugh unit. The higher the Haugh unit and yolk index, the more desirable is the interior quality of egg (
Adeogun and Amole, 2004).