Wednesday, 14 November 2012

Nutrient requirements of meat chickens (broilers)

Nutrient requirements of meat chickens (broilers)


The intake of nutrients is a function of the amount of feed eaten and the nutrient levels in the diet.

Feed consumption and body weight

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)
Age
(weeks)
Male
Bodyweight
Male
Cumulative Feed Intake
Female
Bodyweight
Female
Cumulative Feed Intake
0400400
1170150165145
2450480420460
386511207801030
41410202012501825
52250320017502830
62700450023004020
73350600028005400
83900740033006800
94400880037008200
Source: Poultry CRC

Nutrient levels for broiler diets


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
NutrientsStarterGrowerFinisher
Age fed0-1011-2425-slaughter
Crude protein (%)22-2521-2319-21
ME (MJ/kg)12.6013.3013.50
ME (kcal/kg)301031753225
Total Arginine (%)1.481311.11
Digestible Arginine (%)1.331.181.00
Total Lysine (%)1.441.251.05
Digestible Lysine (%)1.271.100.92
Total Methionine (%)0.510.450.39
Digestible Methionine (%)0.470.420.36
Total Methionine +Cystine (%)1.090.970.83
Digestible Methionine +Cystine (%)0.940.840.72
Total Threonine (%)0.930.820.71
Digestible Threonine (%)0.800.700.61
Total Trypophan (%)0.250.220.19
Digestible Tryptophan (%)0.220.190.17
Total Valine (%)1.090.960.81
Digestible Valine (%)0.940.830.70
Calcium (%)1.00.900.85
Available
phosphorous (%)
0.500.450.42
Sodium (%)0.160.160.16
Source: Ross Broiler Management Manual 







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