Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of lay
This study aimed to determine the effects of dietary ME and BW restriction on layer pullet sexual maturation, carcass composition and reproductive organs. Two trials were conducted: a precision feeding (PF) (Experiment 1) and a conventional (CON) experiment (Experiment 2). Experiment 1 was a 2 × 4 f...
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Elsevier
2025-01-01
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| Series: | Poultry Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0032579124012185 |
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| author | Thiago L. Noetzold Jo Ann Chew Douglas R. Korver René P. Kwakkel Laura Star Martin J. Zuidhof |
| author_facet | Thiago L. Noetzold Jo Ann Chew Douglas R. Korver René P. Kwakkel Laura Star Martin J. Zuidhof |
| author_sort | Thiago L. Noetzold |
| collection | DOAJ |
| description | This study aimed to determine the effects of dietary ME and BW restriction on layer pullet sexual maturation, carcass composition and reproductive organs. Two trials were conducted: a precision feeding (PF) (Experiment 1) and a conventional (CON) experiment (Experiment 2). Experiment 1 was a 2 × 4 factorial arrangement with two feed allocation (FA) levels: meal every visit (MEV) or restricted to the lower limit of Lohmann Brown-Lite recommended BW; and three dietary ME levels: Low, Standard (Std), and High (2,600, 2,800, and 3,000 kcal/kg, respectively); the fourth treatment enabled birds to choose from the three diets (Choice). Experiment 2 was a 2 × 3 factorial arrangement with two FA levels: ad libitum or restricted to the lower limit of the strain recommended BW; and three dietary ME levels: Low, Std, and High. In Experiment 1, age at first egg (AFE), BW at first egg (BWFE), and carcass composition estimations were recorded. In Experiment 2, age at 50 % of egg production (A50), BW at 50 % of egg production (BW50), and chemical carcass composition were determined. Weight of reproductive organs were measured only in Experiment 2. Data were submitted to ANOVA on each experiment with the two main effects and age as fixed factors. Differences were reported where P ≤ 0.05. The BWFE and BW50 were greater in the MEV- and ad libitum-fed compared to the feed restricted birds in Experiments 1 and 2, respectively. Carcass lean and fat percentage were greater and lower in the feed restricted compared to the MEV- and ad libitum-fed pullets at 20 and 18 wk of age, respectively. Carcass fat percentage around photostimulation age (18 and 20 wk) was greater in the High ME compared to the Low ME fed pullets. Large yellow follicles (number and weight) and ovary (weight and percentage) were greater in ad libitum-fed compared to feed restricted birds. In conclusion, pullets fed greater dietary ME increased fat deposition and feed restricted birds had delayed sexual maturation. |
| format | Article |
| id | doaj-art-d8528901c89249b3814fd43efe7b3a35 |
| institution | Kabale University |
| issn | 0032-5791 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Poultry Science |
| spelling | doaj-art-d8528901c89249b3814fd43efe7b3a352025-01-22T05:40:48ZengElsevierPoultry Science0032-57912025-01-011041104640Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of layThiago L. Noetzold0Jo Ann Chew1Douglas R. Korver2René P. Kwakkel3Laura Star4Martin J. Zuidhof5Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2P5; Corresponding author.Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2P5Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2P5Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2P5; Department of Animal Sciences, Animal Nutrition Group, Wageningen University, 6700 AH Wageningen, The NetherlandsSchothorst Feed Research, Meerkoetenweg 26, 8218 NA Lelystad, The Netherlands; Department of Applied Research, Aeres University of Applied Sciences, De Drieslag 4, 8251 JZ Dronten, The NetherlandsDepartment of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2P5This study aimed to determine the effects of dietary ME and BW restriction on layer pullet sexual maturation, carcass composition and reproductive organs. Two trials were conducted: a precision feeding (PF) (Experiment 1) and a conventional (CON) experiment (Experiment 2). Experiment 1 was a 2 × 4 factorial arrangement with two feed allocation (FA) levels: meal every visit (MEV) or restricted to the lower limit of Lohmann Brown-Lite recommended BW; and three dietary ME levels: Low, Standard (Std), and High (2,600, 2,800, and 3,000 kcal/kg, respectively); the fourth treatment enabled birds to choose from the three diets (Choice). Experiment 2 was a 2 × 3 factorial arrangement with two FA levels: ad libitum or restricted to the lower limit of the strain recommended BW; and three dietary ME levels: Low, Std, and High. In Experiment 1, age at first egg (AFE), BW at first egg (BWFE), and carcass composition estimations were recorded. In Experiment 2, age at 50 % of egg production (A50), BW at 50 % of egg production (BW50), and chemical carcass composition were determined. Weight of reproductive organs were measured only in Experiment 2. Data were submitted to ANOVA on each experiment with the two main effects and age as fixed factors. Differences were reported where P ≤ 0.05. The BWFE and BW50 were greater in the MEV- and ad libitum-fed compared to the feed restricted birds in Experiments 1 and 2, respectively. Carcass lean and fat percentage were greater and lower in the feed restricted compared to the MEV- and ad libitum-fed pullets at 20 and 18 wk of age, respectively. Carcass fat percentage around photostimulation age (18 and 20 wk) was greater in the High ME compared to the Low ME fed pullets. Large yellow follicles (number and weight) and ovary (weight and percentage) were greater in ad libitum-fed compared to feed restricted birds. In conclusion, pullets fed greater dietary ME increased fat deposition and feed restricted birds had delayed sexual maturation.http://www.sciencedirect.com/science/article/pii/S0032579124012185Egg-type pulletsSexual maturationBody compositionOvary morphologyFeeding strategy |
| spellingShingle | Thiago L. Noetzold Jo Ann Chew Douglas R. Korver René P. Kwakkel Laura Star Martin J. Zuidhof Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of lay Poultry Science Egg-type pullets Sexual maturation Body composition Ovary morphology Feeding strategy |
| title | Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of lay |
| title_full | Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of lay |
| title_fullStr | Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of lay |
| title_full_unstemmed | Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of lay |
| title_short | Effects of metabolizable energy intake and body weight restriction on layer pullets: 2 - Body composition and onset of lay |
| title_sort | effects of metabolizable energy intake and body weight restriction on layer pullets 2 body composition and onset of lay |
| topic | Egg-type pullets Sexual maturation Body composition Ovary morphology Feeding strategy |
| url | http://www.sciencedirect.com/science/article/pii/S0032579124012185 |
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