Historically the calculation of energy needs has been of little concern; layers have generally been permitted to determine their own level of feed consumption and rations were formulated for the other required nutrients accordingly.
For example, if a flock is naturally consuming 104.3 gms/ bird/ day (23 pounds/ 100/ day) and it is determined that a daily intake of 0.345 grams of methionine is optimal, then the feed would be formulated to contain 0.33 percent methionine (0.345 divide by 104.3 times 100).
The other nutrients are calculated similarly.
Although this approach is adequate under normal conditions, there may be situations when birds are unable to consume enough feed and thus not enough energy to maintain optimum production. Then it becomes necessary to manipulate energy intake by using higher energy feed ingredients and/ or by utilising other means to stimulate feed intake.
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Article made possible through the contribution of Hy-Line International.