NDF degradability of hays measured in situ and in vitro

Spanghero, M.; Boccalon, S.; Gracco, Luisa; Grüber, L.

doi:10.1016/s0377-8401(02)00327-9

Cited by 42 publications

(23 citation statements)

References 14 publications

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“…Diet as total mixed ration (TMR) was given to sheep in two equal portions at 08:00 and 18:00 h. The polyester bag size for determination of DM disappearance was 12 × 19 cm, with a pore size of 50 µm. All samples were dried and milled through a 4.0-mm sieve (Spanghero et al, 2003;Yalchi and Kargar 2010). Then, 5 g of each sample was put in the nylon bags and incubated in the rumen for 2, 4, 12, 24, 48, 72 and 96 h. All bags were inserted at the same time, just before the morning feeding (08:00 h).…”

Section: Methodsmentioning

confidence: 99%

Determination of digestibility of almond hull in sheep

Yalchi¹

2011

Afr. J. Biotechnol.

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A study was conducted to determine the chemical composition and digestibility of almond hull using invitro, sacco and vivo methods. Chemical compositions of almond hull and alfalfa hay were determined. The crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of almond hull were lower than those of alfalfa hay but the non fibrous carbohydrate (NFC) was more than that of alfalfa hay (3.5 times) (P < 0.01). The dry matter disappearance of almond hull for all incubation times using in sacco method was greater than that of alfalfa hay (P < 0.01). To measure in vivo digestibility, four mature Moghani sheep of live weight (39 ± 3 kg mean±SD) were used in a 2 × 2 change over design. Diets consisted of a basal diet (alfalfa hay) and a mixed diet (alfalfa hay 70% + almond hull 30%). Invitro and vivo dry matter digestibilities of almond hull were 585.8 and 645.0 gkg -1 , respectively. There was no difference between in vivo dry and organic matter digestibility of alfalfa hay and mixed diet but were significantly affected in the case of CP and NDF (P < 0.01). In general, almond hull had low CP but greater NFC content as well as greater digestibility in sheep.

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Section: Methodsmentioning

confidence: 99%

Determination of digestibility of almond hull in sheep

Yalchi¹

2011

Afr. J. Biotechnol.

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“…Crude protein concentrations for the calibration samples were calculated as 6.25 times the total N concentration determined using a LECO FP-428 N analyzer (LECO Corporation). Calibration for IVTD was determined through a 48-h in vitro digestion, followed by washing with a neutral detergent fiber solution, as described by Spanghero et al (2003). A Daisy incubator and an ANKOM 200 Fiber Analyzer were used for this assay (ANKOM Technology,).…”

Section: Forage Measurementsmentioning

confidence: 99%

Nitrogen Fertilization Rates Influence Stockpiled Tall Fescue Forage through Winter

et al. 2017

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Tall fescue [Lolium arundinaceum (Schreb.) Darbyish.] can be autumn stockpiled to extend the grazing season. The objectives of this study were to determine (i) optimum mid‐August N fertilization rate for stockpiled yield with or without red clover (Trifolium pratense L.), (ii) if mid‐August N applications affect the persistence of red clover in a mixed sward, (iii) how N fertilization rates affect total ergot alkaloids (TEA) in November, and (iv) if N fertilization rates and harvest months affect nutritive value through winter. At the University of Missouri Forage Systems Research Center near Linneus, MO, five N fertilization rates were applied in mid‐August and forage was harvested the following November through March. Dry matter yield, crude protein (CP), and in vitro true digestibility (IVTD) were determined for each sampling date. Each November, TEA were measured from tall fescue‐only plots. Red clover densities were determined each June. Stockpiled yields increased with increasing N fertilization rates up to 168 kg N ha−1. Red clover neither impaired nor improved stockpiled forage yield. Red clover densities decreased linearly as N fertilization rate increased the previous August. Sward type affected nutritive value minimally. Losses in CP and IVTD through winter averaged 20 and 60 g kg−1, respectively, over the 4 yr. Application of 56 kg N ha−1 provided forage with CP concentrations that would support nonlactating beef cows. Fertilization rates of ≥112 kg N ha−1 resulted in November TEA concentrations that are toxic to grazing livestock. For optimum stockpiled forage yields, forage should be fertilized with <112 kg N ha−1 and grazed before January.

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“…Thus, IVNDFD explained 94% of the variability in ISNDFD values (Figure 1). In cattle, Spanghero et al [36] found a similar relationship, but on the contrary, the IVNDFD values were on average 19% higher than the effective in situ degradability of NDF. Robinson et al also reported higher IVNDFD than ISNDFD values at 48 h [37].…”

Section: Resultsmentioning

confidence: 91%

Ruminal Degradability and Summative Models Evaluation for Total Digestible Nutrients Prediction of Some Forages and Byproducts in Goats

Rosendo

Freitez

López

2013

ISRN Veterinary Science

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In in vitro true dry matter degradability (IVTDMD), in situ dry matter degradability, and neutral detergent fiber degradability, both in vitro (IVNDFD) and in situ (ISNDFD) techniques were used with crossbred goats to determine dry matter and neutral detergent fiber (NDF) ruminal degradability in eight forages and four industrial byproducts. Total digestible nutrients (TDN) content obtained with five different summative models (summative equations) were studied to compare the precision of estimates. All these models included digestible fractions of crude protein, ether extract, and nonfiber carbohydrates that were calculated from chemical composition, but digestible NDF (dNDF) was obtained from IVNDFD (IVdNDF), ISNDFD (ISdNDF), or by using the Surface Law approach. On the basis of the coefficient of determination (R 2) of the simple lineal regression of predicted TDN (y-axes) and observed IVTDMD (x-axes), the precision of models was tested. The predicted TDN by the National Research Council model exclusively based on chemical composition only explains up to 41% of observed IVTDMD values, whereas the model based on IVdNDF had a high precision (96%) to predict TDN from forage and byproducts fiber when used in goats.

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NDF degradability of hays measured in situ and in vitro

Cited by 42 publications

References 14 publications

Determination of digestibility of almond hull in sheep

Determination of digestibility of almond hull in sheep

Nitrogen Fertilization Rates Influence Stockpiled Tall Fescue Forage through Winter

Ruminal Degradability and Summative Models Evaluation for Total Digestible Nutrients Prediction of Some Forages and Byproducts in Goats

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