Age related changes in laying pattern and egg weight of different laying hen genotypes

Tůmová, E.; Uhlířová, Linda; Tuma, Rahilda Conceição Ferreira Brito; Chodová, Darina; Máchal, L.

doi:10.1016/j.anireprosci.2017.06.006

Cited by 22 publications

(9 citation statements)

References 19 publications

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“…The very strong positive correlation between age and mean egg weight as the birds increased in age from 19 to 45 weeks, as observed in this study, is not a new phenomenon and has been reported elsewhere (Padhi et al, 2013;Tůmová et al, 2017), including the developers of the breed which was used in the current study (Lohmann Tierzucht, 2018c). In the current study, the dramatic increase in weight with advancing age occurred between 19 and 27 weeks rather than after the 30 weeks reported in another study (Yi et al, 2014).…”

Section: Discussionsupporting

confidence: 89%

Evaluation of Factors Affecting Productivity and Profitability of Lohmann Brown Layers in A Semi-Arid Environment

Samkange¹,

Kandiwa²,

Mushonga³

et al. 2020

AJVS

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A prospective 27-week study investigated the effect of age, ambient temperature, humidity and photoperiod on egg weight and production in Lohmann Brown layers, and thus the profitability of the egg-producing enterprise at a farm in central Namibia, designated Farm A. Overall, age of birds, average temperature, humidity and photoperiod were strongly correlated with mean egg weight (r=0.84, 0.7,-0.51 and 0.7, respectively; p<0.001) but there was a weaker correlation of age, temperature, humidity and photoperiod to the number of eggs/bird (r=0.49, 0.41,-0.43 and 0.34, respectively). Increase in the age of birds, temperature and photoperiod resulted in a significant increase in mean egg weight. A decrease in humidity, however, resulted in a significant increase in mean egg weight. Labour and feed costs contributed 51% and 14%, respectively, to the overall costs of the enterprise. Egg sales contributed the bulk of the income at 88%, which was followed by the sale of spent layers at 12%.The study concluded that Lohmann Brown layers performed well in the semiarid conditions of central Namibia provided that extreme environmental conditions are avoided. The high input costs, especially labour and feed, were the main constraints to profitability and finding ways to reducing these costs is key to increasing profitability. Increasing the size of the flock is one practical way of offsetting the high labour costs.

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Section: Discussionsupporting

confidence: 89%

Evaluation of Factors Affecting Productivity and Profitability of Lohmann Brown Layers in A Semi-Arid Environment

Samkange¹,

Kandiwa²,

Mushonga³

et al. 2020

AJVS

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“…Indeed, when comparing different strains between 25 and 28 weeks of age, Ali et al (2019a) found a higher number of brown hens in nests during the morning compared to white hens, whereas these latter used the nest more extensively during the day and were in higher number in the nest at midday. In fact, in Hy-line hens at 21 weeks of age, Hunniford et al (2017) found that the number of hens sitting and eggs laid in the nest reached a peak between 8.30 h and 9.30 h. Surely, laying pattern can change with hen genotype (Tůmová et al, 2017), but any overcrowding could increase eggs laid outside the nest because hens could not reach the nest during peak demand hours, which prevents them to perform their normal pre-laying behaviour and cause frustration, thus affecting their welfare (Kruschwitz et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Early training of hens: effects on the animal distribution in an aviary system

Pillan

Trocino

Bordignon

et al. 2020

Acta fytotechn zootechn

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“…However, in the current study all birds were fed according to a predefined PF strategy. The rate of lay could also have affected egg weight, as hens that lay less eggs may have a higher rate of yolk deposition per follicle, leading to higher egg weight (McLeod et al, 2014 ; Tůmová et al, 2017 ). However, this hypothesis is not supported by the current results, as the rate of lay was lower in the Standard BW × 18WK treatment compared to the High × 18WK treatment (55.5 vs. 67.1%, P < 0.001), whereas the eggs of the Standard BW × 18WK treatment weighed less compared to the High × 18WK treatment.…”

Section: Resultsmentioning

confidence: 99%

Early photostimulation at the recommended body weight reduced broiler breeder performance

et al. 2018

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To synchronize the onset of sexual maturity in the face of high BW variation, the age at photostimulation has been increasing in the broiler breeder industry. This experiment studied the effects of increased BW and earlier photostimulation on broiler breeder reproductive performance where within-treatment BW uniformity was very high. The experiment tested BW and age at photostimulation treatments in a 2 × 2 factorial arrangement. Hens (n = 120) were fed with a precision feeding system to allocate feed individually following the breeder-recommended target BW (Standard) or to a 22% heavier target BW curve reaching the Standard 21 wk BW at 18 wk (High). Hens were photostimulated at either 18 wk (18WK) or 21 wk (21WK) with a 16L:8D photoschedule. Age at first egg (AFE) and individual egg production to 55 wk were recorded. Differences were reported as significant if P ≤ 0.05. The AFE was decreased and maturation interval between photostimulation and AFE was shorter for hens on the High BW treatment compared to the Standard BW treatment (178.1 vs. 194.7 d and 41.8 vs. 58.2 d, respectively). Hens on the 21WK treatment had a decreased AFE compared to the 18WK treatment (177.0 d vs. 195.9 d) and their maturation interval was shorter (30.0 d vs. 69.9 d). The CV for AFE was higher in the 18WK treatment compared to the 21WK treatment (28.2% vs. 11.2%). Total egg production was higher for hens on the High BW treatment compared to the Standard BW treatment (129.4 vs. 92.8, respectively). Total egg production was higher for hens on the 21WK treatment compared to the 18WK treatment (138.4 vs. 83.8, respectively). Egg weight of Standard BW × 18WK hens was lower compared to High BW × 18WK hens. Current recommended breeder BW may be too low for optimal sexual maturation after photostimulation. It is concluded that even when BW variation is minimized, photostimulation at 18 wk of age is not recommended.

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Age related changes in laying pattern and egg weight of different laying hen genotypes

Cited by 22 publications

References 19 publications

Evaluation of Factors Affecting Productivity and Profitability of Lohmann Brown Layers in A Semi-Arid Environment

Evaluation of Factors Affecting Productivity and Profitability of Lohmann Brown Layers in A Semi-Arid Environment

Early training of hens: effects on the animal distribution in an aviary system

Early photostimulation at the recommended body weight reduced broiler breeder performance

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