Estimates for rumen dry matter degradation of concentrates are higher, but not consistently, when evaluated based on in sacco as compared to in vitro methods
Publikation: Bidrag til bog/antologi/rapport › Konferencebidrag i proceedings › Forskning › fagfællebedømt
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Estimates for rumen dry matter degradation of concentrates are higher, but not consistently, when evaluated based on in sacco as compared to in vitro methods. / Sembach, Lasse Emil; Hansen, Hanne Helene; Dhakal, Rajan; Eriksson, T.; Nielsen, N.I.; Nielsen, Mette Olaf.
Proceedings of the 10th Nordic Feed Science Conference. Swedish University of Agricultural Sciences, 2019. s. 123-128 (Sveriges Lantbruksuniversitet. Institutionen foer Husdjurens Utfordring och Vaard. Rapport; Nr. 302).Publikation: Bidrag til bog/antologi/rapport › Konferencebidrag i proceedings › Forskning › fagfællebedømt
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TY - GEN
T1 - Estimates for rumen dry matter degradation of concentrates are higher, but not consistently, when evaluated based on in sacco as compared to in vitro methods
AU - Sembach, Lasse Emil
AU - Hansen, Hanne Helene
AU - Dhakal, Rajan
AU - Eriksson, T.
AU - Nielsen, N.I.
AU - Nielsen, Mette Olaf
PY - 2019
Y1 - 2019
N2 - NorFor – the Nordic feed evaluation system - currently bases estimates of ruminal crudeprotein and NDF degradation on data from the in sacco nylon bag technique. Thesedegradation profiles are fitted to an exponential model with an intercept as proposed byØrskov and McDonald (1979), where the intercept represents the soluble part of the substrate,while the asymptote is the potentially degradable part (Åkerlind et al., 2011). The in vitro gasproduction technique (IVGPT) is a method used to estimate fermentation kinetics of feeds, byincubating the feeds in buffered rumen fluid and measuring the gas produced over time(Theodorou et al., 1994). Cumulative gas production profiles have been related to dry matter(DM) degradation, by assuming a potentially degradable pool equal to the amount ofsubstrate degraded at the end-point of the fermentation and a constant yield factor of gas todegraded substrate (Dhanoa et al., 2000). The aim of this study was to examine whether DMdegradation estimated from mathematical models fitted to degradation profiles ofconcentrates obtained through the in sacco technique correspond to estimates by the rapidand less costly IVGPT.
AB - NorFor – the Nordic feed evaluation system - currently bases estimates of ruminal crudeprotein and NDF degradation on data from the in sacco nylon bag technique. Thesedegradation profiles are fitted to an exponential model with an intercept as proposed byØrskov and McDonald (1979), where the intercept represents the soluble part of the substrate,while the asymptote is the potentially degradable part (Åkerlind et al., 2011). The in vitro gasproduction technique (IVGPT) is a method used to estimate fermentation kinetics of feeds, byincubating the feeds in buffered rumen fluid and measuring the gas produced over time(Theodorou et al., 1994). Cumulative gas production profiles have been related to dry matter(DM) degradation, by assuming a potentially degradable pool equal to the amount ofsubstrate degraded at the end-point of the fermentation and a constant yield factor of gas todegraded substrate (Dhanoa et al., 2000). The aim of this study was to examine whether DMdegradation estimated from mathematical models fitted to degradation profiles ofconcentrates obtained through the in sacco technique correspond to estimates by the rapidand less costly IVGPT.
M3 - Article in proceedings
T3 - Sveriges Lantbruksuniversitet. Institutionen foer Husdjurens Utfordring och Vaard. Rapport
SP - 123
EP - 128
BT - Proceedings of the 10th Nordic Feed Science Conference
PB - Swedish University of Agricultural Sciences
ER -
ID: 228781881