Neutral detergent fiber increases endogenous ileal losses but has no effect on ileal digestibility of amino acids in growing pigs.
Two experiments were conducted to determine the effect of neutral detergent fiber (NDF) on endogenous amino acids and protein ileal losses; and also apparent ileal digestibility (AID), and standardized ileal digestibility (SID) of amino acids and crude protein. Sixteen barrows were fed four protein-free diets containing graded NDF levels in Experiment 1. NDF was a mixture of sugarcane bagasse and corn leaves (SBCL). Twenty-four barrows were fed diets with soybean protein concentrate (SPC) or casein as protein sources and SBCL or corncobs (CC) as NDF sources in Experiment 2. In Experiment 1, a linear increase (P < 0.05) in endogenous amino acid and protein ileal losses was observed with increased NDF levels, except for arginine, histidine, methionine and proline. In Experiment 2, protein (P < 0.001) and NDF (P < 0.01) sources significantly affected AID of dry matter, which was higher in casein diets (71.7%) and CC diets (70.7%). Protein and NDF sources significantly affected (P < 0.05) SID of crude protein, which was higher in casein diets (92.8%) and CC diets (92.7%). NDF source had no effect (P > 0.05) on SID of amino acids. Overall, this study showed that NDF increased endogenous amino acid and protein ileal losses, but did not affect ileal digestibility of amino acids.
Centro Nacional de Investigación Disciplinaria en Fisiología Animal-Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias, Ajuchitlán, Colón Querétaro, México.
Gerardo
G
Mariscal-Landín
Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Santiago de Querétaro, Querétaro, México.
Tércia Cesária
TC
Reis de Souza
Master Science Thesis, Facultad de Estudios Superiores Cuautitlán-UNAM. Actual Position, Alltech de México, México.
Alejandro
A
Bayardo Uribe
D000596:Amino Acids / Q000378:metabolism*; D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D004032:Diet / Q000662:veterinary*; D004043:Dietary Fiber / Q000494:pharmacology; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion / Q000502:physiology*; D007082:Ileum / Q000502:physiology*; D008297:Male; D011506:Proteins / Q000378:metabolism*; D013552:Swine / Q000254:growth & development* / Q000378:metabolism*
D000596:Amino Acids; D004043:Dietary Fiber; D004044:Dietary Proteins; D011506:Proteins
NDF; amino acids; endogenous losses; ileal digestibility; pig