Effective rumen degradability and intestinal indigestibility of individual amino acids in solvent-extracted soybean meal (SBM) and xylose-treated SBM (SoyPass®) determined in situ

Harstad, Odd Magne; Prestløkken, Egil

doi:10.1016/s0377-8401(99)00114-5

Cited by 50 publications

(47 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Additional evidence of this hypothesis was the significant increase (P < 0.05) observed in the concentration of amino acids between the original feed and its insoluble fraction at zero time (90.0 vs. 95.8 g/16 g N; ESD = 0.77). The similar potentially degradable fraction (b) obtained for TAA and CP is in agreement with the results of Harstad and Prestløkken [9] and it shows that this fraction should be mainly composed of true protein. The degradation rate of this fraction recorded to be higher for TAA than for CP seems to indicate a faster degradation of proteins.…”

Section: Discussionsupporting

confidence: 90%

“…Cozzi et al [4] only studied the essential amino acids and recorded an apparent higher degradability for histidine, arginine and lysine in agreement with the present results. In the same manner, the degradation of branchedchain amino acids, lower than that of TAA showed in this study was also observed in many works [5,9,13,20,27] carried out with punctual incubations. from the rumen with the liquid phase of a part of the soluble proteins.…”

Section: Discussionsupporting

confidence: 87%

“…The results of Susmel et al [30] and Harstad and Prestløkken [9] showed lower degradability values for CP (54% and 52.2%, respectively) and TAA (50% and 53.3%, respectively) than those of the present work. In spite of these lower degradability values, the variability between individual amino acids (in relation to the value of TAA) was, respectively, 2.5 and 2 times higher than in our study.…”

Section: Discussioncontrasting

confidence: 69%

“…The bags were incubated in two incubation series, on different days, for periods of 2, 4, 8, 16 and 24 h. All the bags of each incubation series were placed simultaneously in the rumen just before animals were offered the first meal of the morning (9:00 h). The specifications of the bags and incubations are in agreement with those of the INRA (14,9 vs. 20,8 % ; P < 0,01), pendant que la fraction insoluble potentiellement dégradable a résultée similaire (79,0 vs. 79,2 %). Au contraire, le taux de dégradation a été supérieur pour les AAT (11,5 vs. 8,4 % .…”

Section: Methodssupporting

confidence: 72%

“…Most published results only refer to a few incubation times [5,8,13,16,20,27,32]. However, studies that measured degradability values are limited [4,9,30], and only that of Harstad and Prestløken [9] provided full information about degradation. The aim of the present experiment was to measure the in situ degradation characteristics and the effective degradability of amino acids from SBM, using 15 N as a microbial marker for correcting microbial contamination of feed residues.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Rumen effective degradability of amino acids from soybean meal corrected for microbial contamination

et al. 2000

View full text Add to dashboard Cite

-Rumen degradation kinetics and effective degradability of individual amino acids, total analysed amino acids (TAA) and crude protein (CP) of soybean meal were measured on four rumencannulated wethers using the nylon bag technique. Microbial contamination of the incubated residues was corrected using a continuous 15 N intraruminal infusion and isolated solid associated bacteria as a reference sample. TAA showed a lower soluble fraction (14.9 vs. 20.8%; P < 0.01), a similar insoluble-degradable fraction (79.0 vs. 79.2%) and a higher degradation rate (11.5 vs. 8.4% . h -1 ; P < 0.05) than CP. As a consequence, effective degradability was similar for TAA and CP (74.7 vs. 75.7%). Degradability values of individual amino acids varied moderately (range: ±6% of TAA degradability). Valine, isoleucine, leucine, alanine, aspartic acid and tyrosine showed significantly lower degradability than TAA, while the opposite effect was observed for histidine, threonine and glutamic acid. Degradability of individual amino acids was related to their soluble fraction (r = 0.877; P < 0.001).amino acids degradability / soybean meal / microbial contamination Résumé -Dégradabilité ruminale, corrigée par la contamination microbienne, des acides aminés du tourteau de soja. Les cinétiques de dégradation ruminale et la dégradabilité théorique des acides aminés individuels, des acides aminés totaux analysés (AAT) et des matières azotées totales (MAT) du tourteau de soja ont été établies par la méthode des sachets de nylon sur quatre béliers fistulés dans le rumen. Les résultats ont été corrigés en fonction de la contamination microbienne des résidus, moyennant l'infusion en continu de 15 N dans le rumen et l'emploi comme référence d'un échantillon de bactéries adhérentes isolées du rumen. Les AAT ont été moins solubles que les MAT Reprod. Nutr. Dev. 40 (2000) 579-586 579

show abstract

Section: Discussionsupporting

confidence: 90%