Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phase
This study investigated the effects and interactions among diets formulated to have high starch-to-lipid ratios (S:L), amino acid density [indicated as % digestible lysine (DigLys)], and AME on growth performance and carcass characteristics of heat stressed broilers. A {3,3} simplex lattice design w...
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Elsevier
2025-02-01
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| Series: | Poultry Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0032579124013075 |
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| author | Dilshaan Duhra Denise Beaulieu Tory Shynkaruk Juliano C. de Paula Dorigam Rose Whelan Karen Schwean-Lardner |
| author_facet | Dilshaan Duhra Denise Beaulieu Tory Shynkaruk Juliano C. de Paula Dorigam Rose Whelan Karen Schwean-Lardner |
| author_sort | Dilshaan Duhra |
| collection | DOAJ |
| description | This study investigated the effects and interactions among diets formulated to have high starch-to-lipid ratios (S:L), amino acid density [indicated as % digestible lysine (DigLys)], and AME on growth performance and carcass characteristics of heat stressed broilers. A {3,3} simplex lattice design was used to assess relative effects and generate predictive models. Three basal finisher diets were formulated to have the highest S:L ratio (Basal A; 20:1), DigLys (Basal B; 1.30 %), or AME (Basal C; 3300 kcal/kg). These diets were blended at levels of 0.00, 0.33, 0.67, or 1.00 to produce 10 finisher diets. The mixtures allowed varying S:L ratios (4:1 to 20:1), DigLys (0.80 to 1.30 %), and AME (2800 to 3300 kcal/kg) content of diets. sex-separated (n = 6,864) Ross 708 broiler chicks were placed in separate rooms (5 male and 4 female) with a pen stocking density of 31 kg/m2. Sex-specific starter and grower diets were fed until d 21. The rooms were maintained at 21°C during d 21 to 27. From d 27 to 32, the birds were subjected to cyclical heat stress, with 12 h of 31°C followed by 12 h of 21°C, with a minimum RH of 50 %. BW and feed residual weights were measured on d 21, 27, and 32, then used to calculate BW gain (BWG) and feed-to-gain ratios (F:G). On d 33, 20 birds per treatment per sex were slaughtered to determine carcass characteristics. Under these conditions (d 21 to 32), maximum male BWG of 926 g was estimated to occur when fed a diet comprised of 42.2 % Basal B and 57.8 % Basal C with a S:L ratio of 4:1, AME of 3089 kcal/kg, and 1.01 % DigLys. Diet did not influence female BWG during heat stress. Although a practical recommendation was not possible for optimal breast meat yield (% live weight) and F:G ratios, the results, indicated that increasing DigLys would improve these parameters under heat stress. |
| format | Article |
| id | doaj-art-966a43ee0ada4f7f8d1b9c346c9a6152 |
| institution | Kabale University |
| issn | 0032-5791 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Poultry Science |
| spelling | doaj-art-966a43ee0ada4f7f8d1b9c346c9a61522025-01-06T04:08:30ZengElsevierPoultry Science0032-57912025-02-011042104729Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phaseDilshaan Duhra0Denise Beaulieu1Tory Shynkaruk2Juliano C. de Paula Dorigam3Rose Whelan4Karen Schwean-Lardner5College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan S7N 5A8, CanadaCollege of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan S7N 5A8, CanadaCollege of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan S7N 5A8, CanadaEvonik Operations GmbH, Hanau-Wolfgang, Essen 63457, GermanyEvonik Operations GmbH, Hanau-Wolfgang, Essen 63457, GermanyCollege of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan S7N 5A8, Canada; Corresponding author.This study investigated the effects and interactions among diets formulated to have high starch-to-lipid ratios (S:L), amino acid density [indicated as % digestible lysine (DigLys)], and AME on growth performance and carcass characteristics of heat stressed broilers. A {3,3} simplex lattice design was used to assess relative effects and generate predictive models. Three basal finisher diets were formulated to have the highest S:L ratio (Basal A; 20:1), DigLys (Basal B; 1.30 %), or AME (Basal C; 3300 kcal/kg). These diets were blended at levels of 0.00, 0.33, 0.67, or 1.00 to produce 10 finisher diets. The mixtures allowed varying S:L ratios (4:1 to 20:1), DigLys (0.80 to 1.30 %), and AME (2800 to 3300 kcal/kg) content of diets. sex-separated (n = 6,864) Ross 708 broiler chicks were placed in separate rooms (5 male and 4 female) with a pen stocking density of 31 kg/m2. Sex-specific starter and grower diets were fed until d 21. The rooms were maintained at 21°C during d 21 to 27. From d 27 to 32, the birds were subjected to cyclical heat stress, with 12 h of 31°C followed by 12 h of 21°C, with a minimum RH of 50 %. BW and feed residual weights were measured on d 21, 27, and 32, then used to calculate BW gain (BWG) and feed-to-gain ratios (F:G). On d 33, 20 birds per treatment per sex were slaughtered to determine carcass characteristics. Under these conditions (d 21 to 32), maximum male BWG of 926 g was estimated to occur when fed a diet comprised of 42.2 % Basal B and 57.8 % Basal C with a S:L ratio of 4:1, AME of 3089 kcal/kg, and 1.01 % DigLys. Diet did not influence female BWG during heat stress. Although a practical recommendation was not possible for optimal breast meat yield (% live weight) and F:G ratios, the results, indicated that increasing DigLys would improve these parameters under heat stress.http://www.sciencedirect.com/science/article/pii/S0032579124013075Amino acidBroilerGrowth performanceMeat yieldEnergy |
| spellingShingle | Dilshaan Duhra Denise Beaulieu Tory Shynkaruk Juliano C. de Paula Dorigam Rose Whelan Karen Schwean-Lardner Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phase Poultry Science Amino acid Broiler Growth performance Meat yield Energy |
| title | Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phase |
| title_full | Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phase |
| title_fullStr | Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phase |
| title_full_unstemmed | Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phase |
| title_short | Maximizing the performance of heat stressed broilers by optimizing starch-to-lipid ratios, digestible amino acid, and metabolizable energy during the finisher phase |
| title_sort | maximizing the performance of heat stressed broilers by optimizing starch to lipid ratios digestible amino acid and metabolizable energy during the finisher phase |
| topic | Amino acid Broiler Growth performance Meat yield Energy |
| url | http://www.sciencedirect.com/science/article/pii/S0032579124013075 |
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