Modeling egg production as a means of optimizing dietary nutrient contents for laying hens

Sakomura, Nilva Kazue; Reis, Matheus de Paula; Ferreira, Nayara Tavares; Gous, R. M.

doi:10.1093/af/vfz010

Cited by 13 publications

(7 citation statements)

References 30 publications

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“…This figure was used to calculate the proportion of energy contained in EO, versus the energy intake. The value used per g of EO is in reasonable agreement with the values of 8.4, 7.5, 8.66 and 10 kJ/g of egg output proposed by Emmans [ 37 ], NRC [ 33 ], Chwalibog [ 38 ] and Sakomura, Reis, Ferreira and Gous [ 39 ], respectively. The model generated was extremely strong (r 2 = 0.987), with AME n intake and EO being highly significant.…”

Section: Discussionsupporting

confidence: 86%

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The Impact of Genotype and Age on Energy and Protein Utilization in Individually Housed Brown Laying Hens

Kleyn

Chrystal²,

Ciacciariello

2021

Animals

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Responses to dietary energy and protein levels were compared between two egg-laying genotypes. Individually housed hens of a historic strain (HS) and a modern strain (MS) were compared. In Experiment 1 (Exp.1), four levels of true metabolizable energy, corrected for zero nitrogen retention (TMEn) and four levels of total lysine, were offered from 30 to 40 weeks of age. In Experiment 2 (Exp.2), three levels of apparent metabolizable energy, corrected for zero nitrogen retention (AMEn) and four levels of standardized ileal digestible lysine (SID Lys), were fed from 20 to 30 weeks of age. A randomized factorial block design (4 × 4 Exp.1 and 3 × 4 Exp.2) was applied. Energy utilization for egg output (EO) did not differ (NS), and both strains maintained a constant kJ intake (NS). The efficiency of SID Lys utilization for EO differed, with the MS being the more efficient (p < 0.034). A single model could be used to predict feed intake, using BW, EO, AMEn and SID Lys (r = 0.716). In conclusion, it is unlikely that the requirements of modern layer strains have increased. However, feeding programs should be adjusted for economic reasons and are dependent upon achievable feed intake under particular circumstances.

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Section: Discussionsupporting

confidence: 86%

“…In this experiment, the SID Lys requirement per gram EO was 14.2 mg/g. This is somewhat higher than the value of 9.45 [ 43 ] but more in line with Rostagno, Albino, Hannas, Donzele, Sakomura, Perazzo, Saraiva, de Abreu, Rodrigues, de Oliveira, Barreto and Brito [ 39 ] of 12.4 mg/g.…”

Section: Discussionsupporting

confidence: 76%

The Impact of Genotype and Age on Energy and Protein Utilization in Individually Housed Brown Laying Hens

Kleyn

Chrystal²,

Ciacciariello

2021

Animals

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“…Over the years, many adjustments to the feed composition of laying hens have been made depending on various factors, including production goal, strain, age, egg weight ( EW ), production system, etc. ( Sakomura et al., 2019 ). Recently, some alternative dietary ingredients have been tested to decrease the EP cost without adverse effects on egg laying performance.…”

Section: Introductionmentioning

confidence: 99%

The effects of lignocellulose supplementation on laying performance, egg quality parameters, aerobic bacterial load of eggshell, serum biochemical parameters, and jejunal histomorphological traits of laying hens

Sözcü

İpek

2020

Poultry Science

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This study was performed to investigate the effects of lignocellulose supplementation ( LS ) on performance parameters, egg quality, aerobic bacterial load of eggshell, serum biochemical parameters, and jejunal histomorphological traits of laying hens between 18 and 38 wk of age. A total of 640 pullets at 16 wk of age were allotted to 4 treatment groups as 0 kg (control, CONT ), 0.5 kg, 1 kg, and 2 kg LS per ton of feed. Body weight ( BW ), daily feed intake, egg production ( EP ), egg weight ( EW ), and efficiency of feed utilization ( EF ) were determined as the mean of each 3-wk period between 18 and 38 wk of age. Laying hens in the 1 kg LS group had a higher BW mean (1632.1 g, P < 0.001). The highest mean value of EP and EW were observed in 1 kg LS group (81.8% and 57.3 g, respectively), whereas the lowest values were found in the 2 kg LS group (78.6% and 54.4 g, respectively, P < 0.001). The mean of EF was the lowest in the 1 kg LS group (2.72, P < 0.001). There was a decline in eggshell breaking strength and eggshell thickness in the 2 kg LS, when compared with the 0.5 and 1 kg LS groups ( P < 0.001). The total aerobic bacterial load of the eggshell was the lowest in the 1 kg LS group (4.7 log 10 cfu/mL). The level of aspartate amino transferase and alanine amino transferase showed an increment in both the CONT and 2 kg LS groups ( P < 0.001). The high level of LS (2 kg per ton of feed) caused a decline in the levels of IgY, IgA and IgM, when compared to the 0.5 and 1 kg LS groups ( P < 0.001). Laying hens in 0.5 and 1 kg LS groups had longer villus height (1335.9 μm) in the jejunum than the others ( P < 0.001). These findings showed that the 1 kg LS per ton of feed improved EP and EW, eggshell quality, immunoglobulin levels and intestinal morphology, and decreased the total aerobic bacterial load.

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“…The average egg weight was increased with increasing GML levels in the diet likely due to the increase in ADFI in this study. After laying hens reach sexual maturity, the increase in feed intake mainly contributes to the increase of egg weight, instead of just increasing their body weight ( Sakomura et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Effects of dietary supplementation of glycerol monolaurate on laying performance, egg quality, antioxidant capacity, intestinal morphology and immune function in late-phase laying hens

Wang,

Li,

Wen

et al. 2024

Poultry Science

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Modeling egg production as a means of optimizing dietary nutrient contents for laying hens

Cited by 13 publications

References 30 publications

The Impact of Genotype and Age on Energy and Protein Utilization in Individually Housed Brown Laying Hens

The Impact of Genotype and Age on Energy and Protein Utilization in Individually Housed Brown Laying Hens

The effects of lignocellulose supplementation on laying performance, egg quality parameters, aerobic bacterial load of eggshell, serum biochemical parameters, and jejunal histomorphological traits of laying hens

Effects of dietary supplementation of glycerol monolaurate on laying performance, egg quality, antioxidant capacity, intestinal morphology and immune function in late-phase laying hens

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