The Role iNDF in the Regulation of Feed Intake and  the Importance of Its Assessment in Subtropical Ruminant Systems (the Role of iNDF in the Regulation of Forage Intake)

Harper, Karen; McNeill, David

doi:10.3390/agriculture5030778

Cited by 92 publications

(70 citation statements)

References 46 publications

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“…To better reflect the rumen scenario, it seems logical to reinoculate in vitro cultures with ruminal fluid plus buffer at regular intervals. Reinoculation of ruminal fluid at 120 h for long-digesting feeds has been recommended by multiple sources (Vogel et al, 1999;Raffrenato and Van Amburgh, 2010;Harper and McNeill, 2015).…”

Section: Comparison Of In Vitro Long Digestion Methods and Digestion mentioning

confidence: 99%

Comparison of In Vitro Long Digestion Methods and Digestion Rates for Diverse Forages

et al. 2019

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Unreliable measures of undigested neutral detergent fiber (uNDF) can influence animal nutrition and performance when balancing diets based on flawed forage quality estimates. Two common techniques for in vitro long digestions are the conventional flask method and the ANKOM filtration bag procedure. An ANKOM filter bag has been developed (F58) with an 8‐ to 10‐μm pore size, decreasing the chance of losing particles during neutral detergent fiber (NDF) procedure, but it has not been evaluated for use with in vitro digestions. Our objective was to compare ANKOM F58 bags with F57 bags and the conventional flask method for in vitro long digestions. Analyses incorporated 24 forage samples representing a broad range of temperate and tropical grasses and legumes. A commercial laboratory analyzed the same samples using the conventional flask procedure. Separate analyses evaluated the effect of Na2SO3 for ANKOM F57 and F58 methods and the effect of ruminal fluid plus buffer refreshing at 2‐d intervals with ANKOM F57. Undigested NDF at 240 h on an organic matter basis (uNDF240om) values between methods were different from one another, but rate calculations derived from uNDF240om values were not different. Method pore size was highly correlated (r = −0.993) with uNDF240om values. Results showed that refreshing ruminal inoculum plus buffer at 2‐d intervals for ANKOM F57 and the addition of Na2SO3 during the analysis of ash‐free NDF on an organic matter basis (aNDFom) after ANKOM F57 and F58 in vitro digestions both had significant effects on lowering uNDF240om values.

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Section: Comparison Of In Vitro Long Digestion Methods and Digestion mentioning

confidence: 99%

Comparison of In Vitro Long Digestion Methods and Digestion Rates for Diverse Forages

et al. 2019

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“…The indigestible fraction of NDF (INDF) is not available to rumen microbes and contributes no usable energy to the animal. In newer versions of mechanistic feed evaluation models, INDF is being evaluated to improve the prediction of total NDF digestibility and the accuracy of balancing ruminant diets (Harper and McNeill 2015). This research suggests that selection pressure by plant breeders for increased NDFD may result in new or improved barley forage varieties that allow producers to select varieties with enhanced nutritional qualities, as well as agronomic qualities.…”

Section: Introductionmentioning

confidence: 99%

A nutritional evaluation of common barley varieties grown for silage by beef and dairy producers in western Canada

Nair

Christensen

et al. 2016

Can. J. Anim. Sci.

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This study evaluated the nutritional and neutral detergent fiber digestibility (NDFD) characteristics of seven barley varieties (‘Conlon’, ‘CDC Copeland’, ‘CDC Cowboy’, ‘Falcon’, ‘Legacy’, ‘AC Metcalfe’, and ‘Xena’) grown for silage. Commercial samples (n = 80) harvested at the mid-dough stage were collected over 2 years (2012 and 2013). Average pH and dry matter (DM) content were 4.05% ± 0.17% and 36.8% ± 4.1%, respectively. ‘Falcon’ and ‘AC Metcalfe’ had higher (P < 0.05) CP relative to ‘CDC Copeland’ and ‘Xena’, with intermediate values for the other varieties. Acid (ADF) and neutral (NDF) detergent fiber contents were higher (P < 0.05) for ‘CDC Cowboy’ relative to ‘Conlon’. Starch was higher (P < 0.05) for ‘Legacy’ and ‘Conlon’ than ‘CDC Cowboy’, with intermediate values for other varieties. Legacy had a greater (P < 0.05) 6-h NDFD while ‘CDC Cowboy’ had a greater (P < 0.05) 30-h NDFD. Indigestible NDF (INDF; % NDF) was greater (P < 0.05) for ‘AC Metcalfe’ relative to ‘CDC Cowboy’ and ‘Falcon’. These results indicate that barley varieties vary with respect to chemical composition and NDFD and INDF contents. Selection for higher 30-h NDFD could result in improvements in DM and DE intake and performance of growing beef cattle.

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“…The NDF and ADF contents are other commonly used measures to assess feed quality. An NDF content below 35.5% would be considered good quality, while above 46% would be considered poor [38]. In this study, an NDF value below the threshold was observed in M. stenopetala, S. sesban, and L. leucocephala.…”

Section: Chemical Compositionmentioning

confidence: 49%

Methane Emissions from Ruminant Livestock in Ethiopia: Promising Forage Species to Reduce CH4 Emissions

et al. 2019

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This paper assesses the ability of fodder plants to reduce methane (CH 4 ) emissions while simultaneously improving animal productivity in Ethiopia. Enteric CH 4 emissions from ruminants in Ethiopia increased by 12% or ≈ 6197 Gg CO 2 -eq. in 2017 compared to the year 2011. In this study, six tropical multipurpose forages (Leucaena leucocephala (Lam.) de Wit, Moringa stenopetala (Bak.f.) Cuf., Sesbania sesban (L.) Merr., Cajanus cajan (L.) Millsp., Crotalaria juncea L., and Lablab purpureus L.(Sweet)) and maize stover were characterized in terms of chemical composition, in vitro CH 4 production, and CH 4 concentration (%). The objective was to identify forages with low CH 4 production potential but with adequate forage quality. The forages differed significantly in chemical composition and in enteric CH 4 emission. The dry matter (DM), ash, crude protein (CP), neutral detergent fibre (NDF), acid detergent fibre (ADF), and acid detergent lignin (ADL) ranged between 89.4-95.4%, 6.08-12.5%, 3.3-30.7%, 20.4-76.0%, 10.8-44.8, and 2.9-14.1%, respectively. All forage plants, except maize stover, contained high CP content above a threshold value (i.e., 7%). Cajanus c. generates the lowest amount of CH 4 (32.83 mL/0.2 g DM incubated). CH 4 concentration (%) was used as a potential indicator to determine the capacity of a plant to lower CH 4 production. Among the studied species, L. purpureus showed the highest CH 4 reduction potential (16%) followed by C. juncea (23.45%), M. stenopetala (24.2%), and L. leucocephala (25.5%). M. stenopetala was the most frequently preferred by the farmers followed by C. juncea and L. leucocephala. We concluded that M. stenopetala, C. juncea, and L. leucocephala can be promoted as valuable feed resources for ruminants while simultaneously reducing CH 4 emissions.

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The Role iNDF in the Regulation of Feed Intake and the Importance of Its Assessment in Subtropical Ruminant Systems (the Role of iNDF in the Regulation of Forage Intake)

Cited by 92 publications

References 46 publications

Comparison of In Vitro Long Digestion Methods and Digestion Rates for Diverse Forages

Comparison of In Vitro Long Digestion Methods and Digestion Rates for Diverse Forages

A nutritional evaluation of common barley varieties grown for silage by beef and dairy producers in western Canada

Methane Emissions from Ruminant Livestock in Ethiopia: Promising Forage Species to Reduce CH4 Emissions

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