Quality Characteristics of Eggs From Different Strains of Hens as Related to Time of Oviposition

Performance of BLRI developed native duck under farmer’s condition with supplementary feeding

“…Table 2 shows that Rupali ducks produced heavier eggs (66.86g) followed by local native (62.2g) and Nageswary (57.22g) which differed significantly (P<0.05). This result comply with the findings of Khatun et al (2007) and Arafa et al (1982) who reported that egg weight of ducks vary between strains. Rupali ducks laid eggs of thicker shell (0.61mm) compared to Nageswary duck (0.41mm) and local duck (0.41mm) and differ statistically (P<0.05).…”

Effect of time of oviposition on egg quality characteristics in cages and in a litter housing system

“…In the morning (06:00 h) collection time, significantly (P ≤ 0.05) higher shell thickness was observed, whereas thicker shells (0.398 mm) were found on eggs laid during the early morning hours when compared with eggs laid in the afternoon hours (0.390 mm). These findings are not consistent with those of (Roland and Harms 1974;Arafa et al, 1982;Lee and Choi, 1985;Oguike, 1995;Pavlovski et al, 2000b) who indicated that shell quality of eggs laid in the morning was not as good as that of those laid in the afternoon in caged hens. On the other hand, Harms (1991) established that shell weight was highest in the morning, declined until 12:45 h and increased thereafter.…”

“…The heaviest eggs were collected at 10:00 and 14:00 h. Hens laid the heaviest eggs (63.27 g) during the period of 06:00 to 10:00 h. A similar observation was made by Ayorinde and Olagbuyiro (1991), who revealed that egg weight did not differ significantly between eggs laid at different times. This situation does not comply with the findings of many other studies that were carried out in the cage system (Washburn and Potts, 1975;Choi et al, 1981;Arafa et al, 1982;Lee and Choi, 1985;Novo et al, 1997;Patterson, 1997;Pavlovski et al, 2000a;Aksoy et al, 2001). In the litter system, the time of oviposition did not result in any significant differences in shell quality characteristics except for shell thickness.…”

“…Based on the results indicated in Table (3), it can be noted that in cages the time of oviposition in- (Washburn and Potts, 1975;Choi et al, 1981;Arafa et al, 1982;Lee and Choi, 1985;Novo et al, 1997;Patterson, 1997;Pavlovski et al, 2000a;Aksoy et al, 2001). They proved that afternoon eggs were lighter than morning eggs.…”

“…In a cage housing system, numerous studies indicated that eggs laid early in the morning were heavier than eggs laid during the later periods of the day (Choi et al, 1981;Arafa et al, 1982;Lee and Choi, 1985;Novo et al, 1997;Patterson, 1997). Moreover, most of investigators revealed that eggs had better shell quality characteristics if laid in the afternoon than in the morning (Roland and Harms, 1974;Arafa et al, 1982;Lee and Choi, 1985;Oguike, 1995;Pavlovski et al, 2000a). On the other hand, Ayorinde and Olagbuyiro (1991) revealed that egg weight was not significantly affected by different times of lay.…”