I checked many papers to find the ideal relationship between protein and metabolizable energy in broilers feed. But, didn't get an exact answer. So, what is the exact way to adjust the protein level if the energy level will be changed in broilers ration (e.g. the manual guide for Ross-308 says the ME is 3000 kcal/kg in starter period. So if I want to to increase the requirements into 3025, how this could affect the protein level?)
I would prefer to use the level of digestible limiting amino acids, being much more reliable than the level of (crude) protein. So it all depends on feed composition, as digestibility can vary between different ingredients.
Dr. Kan, is there an exact ratio should be between amino acids and energy in the ration? for example Lysine/Energy? C.A. (Kees) Kan
Samar A Tolba As I am retired for many years already, I am not familiar with the latest data in this respect. However in the attached papers on studies with Ross 308 broilers carried out almost 20 years ago, you can see the figures we used at that time (which we considered optimal at the time) and the results obtained on those diets.
Interesting discussion, I wish to follow answers from experts!
Thank you for the question.
Using Ideal protein concept is much better and you can adjust the ratio between digestible AA in relation to lysine so lysine is your reference AA. in addition to that you should maintain essential amino acids to non-essential AA requirements. However, if you didnt adjust digestible AA requirements, this means that you will feed the bird high protein content and therfore,y ou will need higher energy requirements to get rid of excess nitrogen. Hope it helps!
Since developing birds consume feed primarily to meet their energy needs, the determining factor for the amount of feed consumed is the level of energy in food. The energy ratio: protein below the optimal level will lead to the consumption of amino acids for the purpose of energy production to meet the needs of the body, when there is a malfunction in the ratio. Between energy and protein above the optimal boundary will cause the bird to not get enough protein
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