The intake of nutrients is a function of the amount of feed eaten and the nutrient levels in the diet.
There are a number of factors that influence voluntary feed intake. These are discussed in the section on feed intake. Table 1 provides data on typical feed consumption and bodyweight for modern broiler chickens in relation to age and sex.
Table 1. Bodyweight and cumulative feed consumption for male and female broilers (g)
|MaleBodyweight||MaleCumulative Feed Intake||FemaleBodyweight||FemaleCumulative Feed Intake|
Source: Poultry CRC
Feeding strategies for broiler chickens will vary depending on the target market for the final product. Strategies for feeding broilers destined for the whole bird market will differ from strategies for broilers destined to be sold as pieces. Furthermore, the nutrient intake of fast growing broilers must be carefully controlled to prevent metabolic diseases such as ascites and leg weakness. Table 2 provides data on typical levels of selected nutrients for broiler diets.
Table 2. Examples of broiler diets
|Crude protein (%)||22-25||21-23||19-21|
|Total Arginine (%)||1.48||131||1.11|
|Digestible Arginine (%)||1.33||1.18||1.00|
|Total Lysine (%)||1.44||1.25||1.05|
|Digestible Lysine (%)||1.27||1.10||0.92|
|Total Methionine (%)||0.51||0.45||0.39|
|Digestible Methionine (%)||0.47||0.42||0.36|
|Total Methionine +Cystine (%)||1.09||0.97||0.83|
|Digestible Methionine +Cystine (%)||0.94||0.84||0.72|
|Total Threonine (%)||0.93||0.82||0.71|
|Digestible Threonine (%)||0.80||0.70||0.61|
|Total Trypophan (%)||0.25||0.22||0.19|
|Digestible Tryptophan (%)||0.22||0.19||0.17|
|Total Valine (%)||1.09||0.96||0.81|
|Digestible Valine (%)||0.94||0.83||0.70|
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