Two studies were conducted to assess the effect of dietary protein reduction on N utilization, N excretion, and @entity5066 digestibility in growing @entity1707 . The objective was to determine whether @entity1707 fed diets with a reduced CP concentration could maintain the same N retention as @entity1707 fed an adequate diet. The second objective was to test whether reducing dietary CP concentration decreases @entity5066 digestibility. In each study, six barrows were allotted to one of six dietary treatments in a Latin square design. Treatments consisted of four @entity4336 - @entity1460 meal-based diets containing 15, 12, 9, and 6% CP, a casein-based diet containing 15% CP, and a protein-free diet. Crystalline @entity5066 were included in the 12, 9, and 6% CP diets. The indispensable:dispensable @entity5066 ratio was maintained at 45:55 with the addition of @entity4650 to the 9 and 6% CP diets. The casein-based and protein-free diets were used to determine endogenous total tract N and ileal @entity5066 losses. In the first study, total N losses and N absorbed decreased linearly (P < 0.001) as dietary CP concentration decreased from 15 to 6%. Both a linear (P < 0.001) and a quadratic (P < 0.05) decrease in N retention were found with decreasing dietary CP concentration. @entity1568 retained as a percentage of intake and absorbed increased (P < 0.001) as dietary CP concentration was reduced from 15 to 6%. In the second study, six barrows were surgically fitted with a T-cannula at the terminal ileum to determine ileal @entity5066 digestibility. For all dispensable and most indispensable @entity5066 , apparent and standardized ileal digestibility increased linearly (P 0.01, and for @entity369 , P < 0.05) as dietary CP concentration decreased. These results indicate that dietary CP concentration can be decreased from 15 to 12% with crystalline @entity5066 supplementation to meet an ideal @entity5066 profile without adversely affecting N retention, and that decreasing dietary CP concentration from 15 to 6% increases both dispensable and indispensable @entity5066 ileal digestibility.

XXXX balance and ileal amino acid digestibility in growing @entity1707 fed diets reduced in protein concentration.

@entity1707 :: ('9823', 'Species') :: ['pigs'] @entity5066 :: ('MESH:C566236', 'Disease') :: ['AA'] @entity1568 :: ('MESH:D009584', 'Chemical') :: ['Nitrogen'] @entity4336 :: ('381124', 'Species') :: ['corn'] @entity4650 :: ('CHEBI:16015', 'Chemical') :: ['L-glutamic acid'] @entity1460 :: ('3847', 'Species') :: ['soybean'] @entity369 :: ('CHEBI:29016', 'Chemical') :: ['arginine']
@entity1568 :: (MESH:D009584,Chemical) :: ['Nitrogen']
