Effects of dietary metabolizable energy levels and beak trimming on the performance, egg quality, and economic viability of layers

Performance and egg production of European quails fed with increasing levels of apparent metabolizable energy

“…Unlike studies found in the literature (Granghelli et al, 2019;Pinheiro et al, 2020), the feed conversion rate per dozen eggs increased linearly (p = 0.010; Table 4) with increasing levels of apparent metabolizable energy in the diets during the 129-to 156-day period, with increases of 0.0002 g dozen -1 occurring for each kcal increase in feed apparent metabolizable energy. In this period, the lowest levels of apparent metabolizable energy inclusion in the diets (2,700 kcal kg -1 ) provided the highest feed intake, the highest egg production, and the best feed conversion per dozen eggs (0.40 g dozen -1 ) (Table 4).…”

“…Energy is necessary for the maintenance of vital body functions, such as movement, regulation of body temperature, and synthesis of organic tissues. In addition, energy can also be stored or directed to production functions, such as egg production (Granghelli et al, 2019).…”

Effect of different energy, protein levels and their interaction on productive performance, egg quality, digestibility coefficient of laying Japanese quails

“…As a result, when the birds' energy needs are met, they stop feeding, enabling them to regulate their feed intake following the energy content of the feed ( da Silva Fonseca et al, 2021 ). Other poultry species, including ducks ( Granghelli et al, 2019 ) and laying hens ( Kang et al, 2018 ; Awad et al, 2022 ), have similarly observed reduced feed intake due to increased dietary energy.…”

High dietary energy decreased reproductive performance through increasing lipid deposition in Yangzhou geese at late laying stage

“…Diet with linoleic acid inclusion increased dietary energy and reduced hatchability of fertile eggs ( Fu et al, 2020 ). Researchers found that egg production was positively influenced by dietary ME levels in Novogen White layers at their early egg laying stage ( Granghelli et al, 2019 ). Due to the rapid increase of egg production rate, the increased energy level would be helpful for maintaining energy consumption required by egg production.…”