Essential amino acid recommendations for Isa Brown layers during peak and post peak production

Assessment of four different dietary amino acid profiles recommended for ISA Brown layer hens: A validation study

“… 1 Mean values are based on 2 eggs per replicate and 8 replicates per treatment at each time point. 2 Established by linear broken-line (LBL) and quadratic broken-line (QBL) models from previous study ( Macelline et al., 2022 ). 3 Recommended by Evonik AMINOHen.…”

“…Four recommended EAAP ( Table 1 ) for peak (20 to 44 weeks of age or phase Ⅰ) and post peak (44 to 75 weeks of age or phase Ⅱ) production were used to formulate the experimental diets. The four dietary EAAP tested included: (1) and (2) the recommendation established by LBL and QBL models, respectively, from our previous studies ( Macelline et al., 2022 ), (3) the recommendation by AMINOHen (Evonik) and (4) the recommendation by breeder ( Hendrix Genetics, 2020 ).…”

“… Item, mg/hen per day Lys Met + Cys Thr Val Ile Trp Peak of production (20 to 44 weeks of age) LBL models 2 713 (100) 606 (85) 512 (72) 587 (82) 654 (92) 150 (21) QBL models 2 891 (100) 820 (92) 572 (64) 692 (78) 757 (85) 193 (22) AMINOHen 3 831 (100) 756 (91) 582 (70) 731 (88) 665 (80) 174 (21) ISA Brown 4 850 (100) 740 (87) 595 (70) 750 (88) 680 (80) 191 (22) Post peak production (44 to 75 weeks of age) LBL models 2 688 (100) 562 (82) 459 (67) 603 (88) 567 (82) 153 (22) QBL models 2 861 (100) 691 (80) 607 (70) 726 (84) 751 (87) 191 (22) AMINOHen 3 810 (100) 740 (91) 570 (70) 710 (88) 650 (80) 170 (21) ISA Brown 4 815 (100) 710 (87) 570 (70) 715 (88) 650 (80) 180 (22) 1 The ideal ratios (%) are shown in parentheses. 2 Established by linear broken-line (LBL) and quadratic broken-line (QBL) models from previous study ( Macelline et al., 2022 ). …”

“…Recently, we determined the requirements of Lys, Met + Cys, Thr, Trp, Ile and Val for maximal egg mass in ISA Brown layers for peak and post peak production phases ( Macelline et al., 2022 ). Data on egg production and egg mass were used to predict AA requirements by fitting LBL and QBL models, and then calculating the ratios relative to Lys.…”

The impact of digestible lysine and sulfur amino acids on eggshell quality and egg weight control in old ISA brown hens during 62 to 74 wk

“…The optimal dTSAA requirement for achieving the highest EW (63.27 g) and egg mass (59.12 g/bird/d) was estimated to be 589 mg/bird/d and 583 mg/bird/d, respectively, when the average dLYS intake was 652 mg/bird/d ( Figure 1 ). The estimation for dTSAA requirement for optimum egg production performance has been reported ranged from 621 ( Macelline et al, 2021 ) to 565 mg/bird/d ( Macelline et al, 2022 ). The variations in amino acid requirements can be attributed to various experimental conditions, including breed, age, housing system, basal diet, statistical model, and the chosen production criteria ( Akbari Moghaddam Kakhki et al, 2016 ) ( Figure 2 ).…”