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Traditionally, diet nutrient concentrations decrease over time, with the notable exception of the need for more calcium. Thus, diet protein and amino acid expressed as a percent of the diet or as a ratio to energy decline as the bird progresses through the laying cycle. However this traditionally approach is now being questioned in nutrient [...]
The layer’s peak energy needs are most likely met at around 35 – 40 weeks of age, when daily egg mass output is maximized. However, the layer quite precisely adjusts its intake according to needs for energy, and so variable energy needs are accommodated by change in feed intake.
Most Leghorn strains will now commence egg [...]
Diet formulation and feeding management are now critical aspects of growing pullets to the onset of sexual maturity. Age at maturity is advancing by around one day per year, and this is especially true for many strains of brown egg pullets. The traditional concern with early maturity has been too many small eggs. There seems [...]
Adult breeder hens must be continued on some type of restricted feeding program. After 22 weeks of age, regardless of rearing program, all birds should be fed daily. Because energy intake is the major factor controlling egg production, then it is critical that feed intake be adjusted according to energy density of the diet. Protein [...]
Immature pullets and roosters must be managed so as to achieve the desired uniform weight at the time of photostimulation, which is usually around 22 – 24 weeks of age. Growth and uniformity are influenced by feeding program and, to a lesser extent, by feed formulation. Within reason, it is possible to achieve the desired [...]