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Synopsis
Three trials, involving 1812 five‐week‐old broilers fed four different practical‐type experimental diets, were conducted in order to determine the lysine requirement of broilers during their finishing period (5 to 10–11 weeks of age).
The lysine requirement for the 5–8 week period can be summarised as 0.92 per cent of the diet, or about 3.0 g/Mcal ME when expressed as a function of energy. The corresponding values for the 8–10 week period are 0.76 per cent and 2.5 g respectively.
On the basis of dietary protein, the requirements are 4.9 per cent up to 5 weeks of age (one trial only), 5.0 per cent during the 5 to 8 week period and 4.8 per cent after 8 weeks of age, as long as the kcal (ME) per kg/per cent protein ratios during these periods approximate 146, 167 and 190 respectively. It seems, therefore, that the lysine requirement does not change appreciably with age when it is expressed in terms of dietary protein, although the level of the latter is reduced with subsequent stages of growth, provided that the C/P ratios fall within the conventionally applied ranges.
Notes
Contribution from the Volcani Institute of Agricultural Research, Bet Dagan, Israel. 1969 series, no. 1566‐E.