Response of Laying Hens to Different Dietary Lysine Intakes

Bustany, Zuhair Al; Elwinger, K.

doi:10.1080/00015128709436541

Cited by 18 publications

(4 citation statements)

References 21 publications

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“…Higher requirements were reported by Uzu and Larbier (1985): 800 mg/bird per day and Al Bustany and Elwinger (1987): 820 mg/bird per day. This variation can be assigned to genetic and environmental differences.…”

Section: Introductionmentioning

confidence: 55%

“…The estimate, considering 100% of the maximum value, is in accordance with the result of 1023 mg/bird per day obtained by Al Bustany and Elwinger (1987) to express the E max of laying hens using the same mathematical model. The equivalence between the optimum intake for the BL þQP and RM correlate with the estimate of 700 mg/bird per day Lys, which was found by Nathanael and Sell (1980), to maximize EM and the efficiency of utilization.…”

Section: Optimum Lysine Intakementioning

confidence: 94%

“…As stated, the differences are related to the variability in the population. Al Bustany and Elwinger (1987), when using the QP model, concluded that the economically feasible level of Lys intake was between 766 and 956 mg/bird per day.…”

Section: Optimum Economic Lysine Intakementioning

confidence: 98%

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Lysine requirements of laying hens

et al. 2015

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Section: Introductionmentioning

confidence: 55%

Section: Optimum Lysine Intakementioning

confidence: 94%

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Lysine requirements of laying hens

et al. 2015

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“…Studies have also shown that a specific AA deficiency, such as lysine and sulfur containing AA decreases feather condition. Al Bustani and Elwinger (1987) demonstrated a significant improvement in plumage condition when dietary lysine intake was increased from 485 to 587 mg h −1 d −1 in a low protein diet. A similar AA response on plumage condition was also reported by Elwinger et al (2002) when the lysine and methionine + cysteine levels in organic diets were increased from 5.9 and 5.1 to 8.7 and 6.7 g kg −1 , respectively.…”

Section: Feather Scorementioning

confidence: 99%

Assessing the response of hen weight, body composition, feather score, egg quality, and level of excreta nitrogen content to digestible balanced protein intake of laying hens

et al. 2018

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Ideally balanced dietary protein is critical for laying hen egg production and feed efficiency, but also affects other important characteristics. This research was designed to study the nonegg production and feed intake response of Lohmann-LSL Lite hens to 550, 625, 700, 775, and 850 mg d−1 of amino acid balanced digestible lysine (Dlys) from 27 to 66 wk of age. Data collection included hen weight (HW), feather scoring, tissue weights, egg specific gravity, egg component weights, and excreta nitrogen (N) content. The experiment was a completely randomized design and level of significance was fixed at P ≤ 0.05. Hen weight (quadratic, Q), pectoralis muscle (absolute, % – Q), and abdominal fat (absolute – linear, L; % – Q) increased with increasing Dlys intake. Although gastrointestinal segment weights and lengths were affected by Dlys intake, interpretation of results was confounded by other aspects of diet composition. Hen feather score (L) and excreta N content (Q) increased, and egg shell quality (L) decreased with increasing Dlys intake. Absolute egg component weights increased with Dlys intake, but effects on proportional weights were Q and relatively minor. In conclusion, balanced Dlys intake affected a variety of practical nonproduction characteristics in laying hens.

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Are practice recommendations for the prevention of feather pecking in laying hens in non-cage systems in line with the results of experimental and epidemiological studies?

Jung

Knierim

2018

Applied Animal Behaviour Science

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Feather pecking (FP) in laying hens is an important animal welfare problem in practice, despite extensive research and increasing sources of advice for farmers. We aimed to give an overview over results from experimental and epidemiological studies. We included noncage systems, covering the rearing and laying phase. The investigated factors were categorised into those with either good, contentious or no evidence regarding preventive effects on FP. Moreover, we wanted to know to what extent recommendations for farmers are based on this scientific evidence. We extracted 62 potential preventive factors from 88 experimental and 21 epidemiological studies. 17 factors during rearing, and 32 factors during the laying phase significantly affected the risk to develop FP or plumage damage (PD). Factors were counted as significant if other studies found no or at most one opposite result. Seven factors during rearing and 16 factors during laying were confirmed by more than one study, with no or at most one opposite result. Provision of dry litter on the floor and sufficiently high perches during rearing and laying or a high use of the free range area during the laying phase were among these influencing factors. In the reviewed 15 practice recommendations, almost all of these factors have been taken up, although no recommendation comprises all factors and most miss more than the half of them. This leaves ample room for improvement of the recommendations. On the other hand, they altogether recommend 15 contentious as well as eight non-significant or 12 not yet investigated factors for which further scientific investigation is necessary. Keywords: Laying hens; Feather pecking; Plumage damage; Recommendations 'damaging feather pecking' or 'plumage damage' were included. In addition, reference lists of retrieved papers were searched for further studies. Recommendations were sought using the internet search engine 'Google' with the keywords 'laying hens' and 'feather pecking' which were used in combination with 'recommendations', 'management guidelines' or 'references'. Also, the German keywords 'Federpicken' and 'Legehennenhaltung' were applied in combination with 'Empfehlungen', 'Prävention', 'Managementempfehlungen', or 'Haltungsempfehlungen'. Selection criteria for the recommendations were that they must be freely available, that they covered rearing, placement or the laying period and that they are related to non-cage systems.

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Response of Laying Hens to Different Dietary Lysine Intakes

Cited by 18 publications

References 21 publications

Lysine requirements of laying hens

Lysine requirements of laying hens

Assessing the response of hen weight, body composition, feather score, egg quality, and level of excreta nitrogen content to digestible balanced protein intake of laying hens

Are practice recommendations for the prevention of feather pecking in laying hens in non-cage systems in line with the results of experimental and epidemiological studies?

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