Crude protein and essential XXXX requirements in chicks during the first week posthatch.

@entity535 @entity1522 @entity376
1. This study examined optimal @entity376 and sulphur @entity535 supply in the first week posthatch in broilers and the relationship between essential @entity1522 and dietary crude protein during the first week posthatch on performance at 7 d and through marketing. 2. The optimal supply during the 7 d posthatch using a 230 g/kg crude protein diet for sulphur @entity1522 was 9.1 and for @entity376 was 10.3-10.8 g/kg with maximal body weight (BW) or feed efficiency as the criteria. 3. Feeding diets with crude protein content ranging from 200 to 260 g/kg with either constant amounts of essential @entity1522 at different crude protein levels or constant ratios of essential @entity1522 to crude protein resulted in enhanced performance at 7 but not at 4 d with high protein intake and proportionally increased essential @entity1522 . 4. Performance on diets with crude protein ranging from 160 to 280 g/kg, with constant ratios of essential @entity535 to crude protein, was much enhanced with the high crude protein diets at 7 d. All chicks were transferred to standard diets after 7 d and the BW advantage due to the balanced @entity535 -high crude protein diet remained through marketing. 5. Thus increasing essential @entity1522 in a constant ratio to crude protein enhanced performance during the 7 d posthatch.
