Standardized ileal digestible lysine requirement of white commercial layers in peak egg production

Pastore, Silvana Marques; Gomes, Paulo Cézar; Viana, Gabriel da Silva; Silva, Eliane Aparecida da; Oliveira, Will Pereira de; Barbosa, Leonardo Valentino Soares; Fraga, Alícia Zem; Alves, Warley Júnior

doi:10.14393/bj-v34n1a2018-37205

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…Similarly, the optimum concentration of dLys observed in the current study are considerably higher than the concentration reported by some other researchers [5 dLys, 526 to 561 mg/b/d) for layers of similar age. Similar to the data of the present experiment, few studies [19][20][21] have reported higher Lys (752 to 876 mg/b/d) requirement during the initial production phase. The relatively higher requirements of the dLys observed in the present study compared to some of the earlier reports may partly be attributed to higher rate of production (95% vs 83% to 89%) and also FI (106 g vs 88.7 g to 100 g/b/d) in the present study.…”

Section: Discussionsupporting

confidence: 91%

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Graded concentrations of digestible lysine on performance of White Leghorn laying hens fed sub-optimal levels of protein

et al. 2021

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Objective: An experiment was conducted to study the effect of graded concentration of digestible lysine (dLys) on performance of layers fed diets containing sub-optimal level of protein.Methods: Five diets were formulated to contain graded concentrations of dLys (0.700%, 0.665%, 0.630%, 0.593%, and 0.563%), but similar levels of crude protein (15% CP), energy (10.25 MJ ME/kg) and other nutrients. A total of 3,520 hens (26 wk of age) with mean body weight of 1,215+12.65 g were randomly divided into 40 replicate groups of 88 birds in each and housed in an open sided colony cage house. Each diet was offered <i>ad libitum</i> to eight replicates from 27 to 74 wk of age. The performance was compiled at every 28 d and the data for each parameter were grouped into three phases, that is early laying phase (27 to 38 wk), mid laying phase (39 to 58 wk), and late laying phase (59 to 74 wk of age) for statistical analysis.Results: Egg production, egg mass and feed efficiency (feed required to produce an egg) were significantly improved by the dLys level during the early and mid laying phases but not during the late phase. Whereas feed intake was significantly reduced by dLys concentration during mid and late laying phases but not during early laying phase. The egg weight was not affected by dLys concentration in any of the three phases.Conclusion: Based on best fitted statistical models, dietary requirements of dLys worked out to be 0.685%, 0.640%, and 0.586% during early phase, mid phase, and late egg laying phase, respectively. The calculated requirement of dLys for the respective production phases are 727 mg/b/d during the early and mid laying phases and 684 mg/b/d during the late laying phase in diets containing 15% CP.

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Section: Discussionsupporting

confidence: 91%

“…The FI during the initial 2 periods was not affected by the AA concentration in diet. Another probable reason for higher dLys requirements suggested by Santos et al [20] and Pastore et al [21] could be due to strain variation (Isa Browen and Hy-Line W36) which are heavy in BW compared to the strain used in the current study.…”

Section: Discussionmentioning

confidence: 67%

Graded concentrations of digestible lysine on performance of White Leghorn laying hens fed sub-optimal levels of protein

et al. 2021

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“…(2016) indicated that the proportion of egg components depends primarily of age, with nutrient factors being of low relative interest. Pastore et al. (2018) suggested that Lys is used primarily to support egg production and only when in excess, this AA is used to modify the synthesis of the egg components, consistent with the results reported herein.…”

Section: Discussionsupporting

confidence: 88%

“…In fact, an intake of 690 mg Lys (equivalent to 593 mg DLys/d) was recommended by the NRC (1994) for brown-egg laying hens. More recently, the digestible Lys requirements for white laying hens have been estimated within a range of 540 mg/d ( Schutte and Smink, 1998 ; Bregendahl, 2008 ) to 856 mg/d ( Pastore et al., 2018 ). In fact, Lemme (2009) , Klein (2013) , and Van Krimpen et al.…”

Section: Introductionmentioning

confidence: 99%

Influence of the energy and digestible lysine contents of the diet on performance and egg quality traits of brown-egg laying hens from 19 to 59 weeks of age

Scappaticcio

García²,

Fondevila

et al. 2021

Poultry Science

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The influence of nutrient density and standardized ileal digestible lys ( DLys ) content of the diet on egg production and egg quality traits, was studied in brown-egg laying hens from 19 to 59 wk of age. The experimental design was completely randomized with eight treatments arranged as a 2×4 factorial with two AMEn concentrations (2,680 and 2,780 kcal/kg) and four levels of DLys (0.68, 0.72, 0.76, and 0.80%). Each treatment was replicated nine times and the experimental unit was a cage with nine hens. Hen production, egg components (proportion of albumen, yolk, and shell), egg quality traits (Haugh units, egg shell strength, and incidence of broken, dirty, and shell-less eggs) were measured by period (28 d) and cumulatively. Data were analyzed as a completely randomized design with energy concentration, level of DLys, and their interactions as main effects. In addition, the effects of the level of DLys on the variables studied, were partitioned into its linear and quadratic components. No interactions between AMEn and DLys content of the diet were detected for any of the traits studied and therefore, only main effects are presented. An increase in the AMEn concentration of the diet from 2,680 to 2,780 kcal/kg increased energy intake ( P < 0.05) and egg weight ( P < 0.001) and improved feed conversion ratio ( P < 0.05). An Increase in DLys from 0.68 to 0.80% did not affect the number of eggs produced but increased linearly egg weight ( P < 0.01) and egg mass production ( P < 0.05). Diet did not affect egg quality. In conclusion, an increase in the AMEn content of the diet from 2,680 to 2,780 kcal/kg increased egg weight and improved feed efficiency. Laying hens require no more than 744 mg DLys/d (corresponding to 0.68% DLys) to optimize egg production. However, when the objective is to maximize egg weight, hens should consume at least 843 mg DLys/d (corresponding to 0.76% D Lys).

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“…Other authors have explored modeling Trp requirements based on the ratio to lysine using the linear broken line ( Bregendahl et al., 2008 ) or quadratic polynomial model ( Lima et al., 2012 ; Cardoso et al., 2014 ). The digestible Lys intake of the laying hens in this experiment was 800 mg/d, consistent with previous Lys requirement estimates for laying hen egg production and egg mass, 727 mg/d to 846 mg/d ( Pastore et al., 2018 ; Spangler et al., 2019 ). The estimates for Trp:Lys ratio in this experiment using the linear broken line were 17.1, 16.6, and 16.6 for egg production, egg mass, and feed efficiency, respectively.…”

Section: Resultssupporting

confidence: 90%

Tryptophan requirement of first-cycle commercial laying hens in peak egg production

et al. 2021

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An experiment was conducted to evaluate the digestible tryptophan (Trp) requirement of laying hens from 22 to 34 wk of age. A total of 252 Hy-line W-36 laying hens were selected at 16 wk of age and allocated by weight ( P = 0.90) to 7 dietary treatments resulting in 12 replicate cages of 3 birds for each treatment. A Trp-deficient basal diet was formulated using corn, corn gluten meal, and soybean meal for each of the 3 dietary phases and supplemented with synthetic L-Trp to provide 105, 119, 133, 147, 162, 176, and 190 mg digestible Trp on a daily basis over the experimental period. To adapt the hens to experimental diets, pullets were fed complete diets that contained increasing amounts of corn gluten meal. Hens received a controlled amount of feed daily based on feed intake expected under commercial conditions. Linear and quadratic broken-line, and quadratic polynomial models were used to estimate digestible Trp requirements based on hen-housed egg production (HHEP), egg mass (EM), and feed efficiency (FE). FE was calculated using EM and feed intake. Digestible Trp requirements were estimated to be 137, 183, and 192 mg/d for HHEP; 133, 180, and 183 for EM and 133, 177, and 173 for FE using linear broken-line, quadratic broken-line, and quadratic polynomial analysis, respectively. The quadratic broken line model in this experiment resulted in the best fit (R 2 ) for all parameters measured. Linear broken line estimates resulted in lower estimates that the other models, and HHEP resulted in higher estimated digestible Trp requirement than EM and FE.

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Standardized ileal digestible lysine requirement of white commercial layers in peak egg production

Cited by 6 publications

References 15 publications

Graded concentrations of digestible lysine on performance of White Leghorn laying hens fed sub-optimal levels of protein

Graded concentrations of digestible lysine on performance of White Leghorn laying hens fed sub-optimal levels of protein

Influence of the energy and digestible lysine contents of the diet on performance and egg quality traits of brown-egg laying hens from 19 to 59 weeks of age

Tryptophan requirement of first-cycle commercial laying hens in peak egg production

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