Effect of Broiler Breeders’ Age on Eggshell Temperature, Embryo Viability and Hatchability Parameters

Nowaczewski, S.; Babuszkiewicz, Mateusz; Kaczmarek, S.

doi:10.1515/aoas-2015-0081

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…However, Abudabos (2010) showed that the best hatchability was obtained from hens at 26 weeks (Cobb 500 line) and 32 weeks (Ross 308 line) of age. Our results were similar to those of Nowaczewski et al (2016), who demonstrated the best hatchability in eggs laid by hens aged 40 weeks. However, our research indicated that the Ross 308 line at age 52 weeks had the best hatchability.…”

Section: Discussionsupporting

confidence: 91%

“…This may be indicative of a properly balanced feeding regime among the tested hens. On the other hand, many authors showed that the reduced hatchability of the eggs from the older broiler breeders may be caused by many factors, including a larger egg size (Nowaczewski et al 2016), poorer shell quality (Iqbal et al 2016) or a deterioration in the albumen quality (Tona et al 2004).…”

Section: Discussionmentioning

confidence: 99%

“…The results obtained in this study, however, correspond with those of other authors (Tona et al 2003;Tona et al 2004;Abudabos 2010;King'ori 2011;Alsobayel et al 2013;Jacobs et al 2016), who pointed out the relationship between the age of the parent flock and the quality of the hatched chicks. Willemsen et al (2008) and Nowaczewski et al (2016) demonstrated that the older the breeder, the greater the incidence of chick body defects, which, thus, reduces the quality of the one-day-old chicks. Tona et al (2004) stated that chick mortality, with the highest quality and hatchability, was the lowest when the breeders were aged 40 weeks.…”

Section: Discussionmentioning

confidence: 99%

“…The quality of the one-day old chicks primarily depends on genetic factors (Hristakieva et al 2014), Veterinarni Medicina, 64, 2019 (07): 323-333 https://doi.org/10.17221/137/2018-VETMED the biological value of the eggs (Othman et al 2014) and the handling of the chicks after hatching (Jacobs et al 2016). Proper maintenance of the parent flock (Paraguassu and Arango 2012), the breeder's age (Nowaczewski et al 2016), the appropriate nutrition and a high level of welfare guarantees the production of hatching eggs of a high biological value (King'ori 2011). The handling of the eggs during transport, as well as their disinfection and incubation is also important (Jacobs et al 2016).…”

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confidence: 99%

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Breeder line and age affects the occurrence of developmental defects, the number of culled one-day old broiler chicks and their body mass

Nowak¹,

Pawlina²,

Ilska³

et al. 2019

Vet. Med. - Czech

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The objective of this work was to study the reasons for culling one-day old broiler chicks and to examine the relationship between the age and line of the hens and the culled chick’s body mass. Hatching eggs and day-old chicks were collected from a commercial flock of the Cobb 500 and Ross 308 broiler lines. The eggs were collected when the hens were 32, 42 and 52 weeks old. The reasons for culling the chicks were assessed immediately after the chicks had been removed from the hatcheries. The four main groups of defects were distinguished, depending on the part of the chick’s body. A fifth group covered general developmental defects. Within each group, the structural defects were identified in detail. The statistical analysis was performed in the R project. Amongst 57 600 chicks evaluated, 1042 malformations disqualifying them from further rearing were found in 666. The most frequent developmental defects were associated with the structure of the abdominal wall and umbilical cord: these were found in 155 chicks from the Ross 308 line and in 107 from the Cobb 500 line. In turn, umbilical defects occurred in 95 and 104 chicks from the Ross 308 and Cobb 500 lines, respectively. Abdominal defects were the most common in 107 chicks from the 42-week-old layers and in 89 chicks from the 52-week-old layers. There were also correlations between the age of the parent flock and the following defects: glued down, lack of down on the wings, contorted hips, wry neck and spine, and lack of a wake-up reflex. The average body weights of the Ross 308 and Cobb 500 chicks were 44.00 g and 43.13 g, respectively, but these differences were not statistically significant. However, the age of the broiler breeders (42 or 52 weeks) did affect the chick’s body weight (P ≤ 0.05). The lightest chicks (40.75 g) came from the Ross 308 line (age 42 weeks) and were nearly 4 g lighter than all the other groups. Most relationships between the lines of the layer hens at a particular age and the occurrence of malformations in the chicks were found in the hens aged 32 weeks, which may indicate the need for changes in the management of the eggs from the youngest layers belonging to the different lines.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Breeder line and age affects the occurrence of developmental defects, the number of culled one-day old broiler chicks and their body mass

Nowak¹,

Pawlina²,

Ilska³

et al. 2019

Vet. Med. - Czech

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show abstract

“…This may be due to the limited air passage due to the coating of egg with chitosan. Nowaczewski et al (2016) reported that the eggshell temperature was 37.9°C in eggs on the 18 th day of incubation obtained from hens of 46-64 weeks of age.…”

Section: Re Sults and Discussionmentioning

confidence: 99%