Journal of Animal Science and Biotechnology

Table 3 In situ protein degradability and intestinal availability of N from soybean meals (SBM) from China and the United States

From: In Vitro assessment of the nutritive value of expanded soybean meal for dairy cattle

	SBM made in China			United States SBM
Item	C-sSBM	C-eSBM	C-ff-eSB	US-sSBM	US-meSBM	SEM¹
n	5	14	2	2	2
N remaining in situ, g/g
0 h	0.909^a	0.897^a	0.768^b	0.878^ab	0.808^b	0.016
4 h	0.691	0.710	0.630	0.669	0.691
8 h	0.511^ab	0.516^ab	0.485^b	0.439^b	0.603^a
16 h	0.219^c	0.293^bd	0.300^bc	0.218^cd	0.444^a
24 h	0.112^c	0.134^c	0.223^b	0.056^c	0.356^a
48 h	0.014^b	0.014^b	0.072^ab	0.006^ab	0.113^a
In situ N kinetics
B pool, g/g	0.934^a	0.921^a	0.785^c	0.906^ab	0.811^bc	0.013
Kd, h^-1	0.0857^a	0.0762^a	0.0697^a	0.0942^a	0.0386^b	0.0031
RUP, g/g²
Kp = 0.04/h	0.305	0.326	0.328	0.279	0.420	0.013
Kp = 0.06/h	0.392	0.414	0.402	0.361	0.499	0.015
Kp = 0.08/h	0.458	0.479	0.455	0.424	0.552	0.015
Three-step procedure³
16-hour RUP, g/g	0.236^b	0.263^b	0.315^ab	0.178^b	0.434^a	0.019
Intestinal digestion, g/g	0.832	0.827	0.846	0.832	0.843	0.0033
Total availability, g/g	0.199^b	0.220^b	0.269^ab	0.148^b	0.374^a	0.016

Within a row, products not sharing a common superscript are significantly different (P < 0.05)
C-sSBM, solvent SBM made in China; C-eSBM, expanded SBM made in China; C-ff-eSB, full-fat expanded soybeans made in China; US-sSBM, United States solvent SBM; US-meSBM, United States mechanically extracted SBM; N, nitrogen; B pool, potentially degraded fraction; Kd, degradation rate of B pool; RUP, ruminally undegraded protein; Kp, ruminal passage rate
¹ Standard error of the mean for n = 14. To obtain SEM for n = 5, multiply by 1.67; to obtain SEM for n = 2 multiply by 2.65
² Calculated as: B × (Kp/(Kp+Kd))
³ Calsamiglia and Stern [12]

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ISSN: 2049-1891

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