The effect of different digestible lysine (dlys) levels on production performance and eggshell quality attributes in old lohmann brown hens (82 – 87 weeks)
Abstract:
The egg weight (EW) increases as the hen ages, but unfortunately, eggshell quality does not improve with increasing EW. Dietary changes can help control the increase EW, resulting in improved eggshell quality. This experiment aimed to deterMomine the effect of different digestive lysine (dLYS) levels on the production performance and eggshell quality of 82-87-week-old Lohmann Brown hens and identify the optimal level of dLYS intake to achieve an optimal production performance and the level of dLYS that can improve eggshell quality by modifying EW. A total of 240 Lohmann Brown hens were selected for the experiment (79-87 weeks). These were distributed in individual cages and 6 treatments with 40 replicates per treatment. The cages were divided into 40 blocks of 6 consecutive cages. In each block, the treatments were randomly distributed in the room. The treatments were 6 different diets with different dLYS levels (6.72, 6.40 (control diet (CON)), 6.08, 5.76, 5.44, 5.12 g/kg). The production performance and eggshell quality were evaluated, and the ideal dLYS was calculated by linear broken-line regression.
Modifying dLYS levels from 6.08 to 5.12 g/kg decreased a hen day egg production (HDEP) by 4.4%, and reduced egg mass (EM) by 3.2 g/d. Adjusting dLYS levels from 5.44 to 5.12 g/kg reduced 2.2 g the egg weight (EW). Changing dLYS levels from 6.40 to 5.44 g/kg increased the average feed daily intake (ADFI) by 5 g. The different dLYS levels did not affect the feed conversion ratio (FCR), but it showed a tendency (P = 0.074). Eggshell quality attributes were not affected by different dLYS levels. The optimal dLYS intake requirement was 713, 646, 626, and 627 mg/b/d to achieve an optimal HDEP, EW, EM, and FCR respectively. In conclusion, the results of this experiment can help the laying hen industry to determine the optimal dLYS for managing EW increase, keeping a good HDEP, EM, FCR, and maintaining eggshell quality in long-life laying hens.
Citación recomendada (normas APA)
Juan Felipe Morales Guarin, "The effect of different digestible lysine (dlys) levels on production performance and eggshell quality attributes in old lohmann brown hens (82 – 87 weeks)", Colombia:-, 2023. Consultado en línea en la Biblioteca Digital de Bogotá (https://www.bibliotecadigitaldebogota.gov.co/resources/3711913/), el día 2025-05-07.
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The effect of different digestible lysine (dlys) levels on production performance and eggshell quality attributes in old lohmann brown hens (82 – 87 weeks)
