scholarly journals The effect of the chemical composition of maize plant lignin on the digestibility of maize stalk in the rumen of cattle

1973 ◽  
Vol 29 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Nadia F. Cymbaluk ◽  
A. J. Gordon ◽  
T. S. Neudoerffer
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Lignin Content ◽  
Ground Tissue ◽  
Maize Silage ◽  
Lignin Concentration ◽  
Normal Maize ◽  
Grass Hay ◽  
Acid Detergent Fibre ◽  
Organic Matter Digestibility

1. Digestibility of maize stalk from Troyer Reid (Tr) maize and its isogenic mutant (bm1) was studied by suspending nylon bags containing ground tissue in the rumen of a fistulated steer. The animal was given a grass hay–concentrate (5:3) diet or a maize silage–grass hay–concentrate (4:1:3) diet.2. The digestibility of the organic matter of the mutant maize stalk was greater than that of the normal maize stalk.3. Adaptation of the rumen to maize silage increased the organic-matter digestibility of the maize stalk.4. Lignin content was determined by two methods, namely organic matter insoluble in 72% sulphuric acid (method of the Association of Official Agricultural Chemists, 1960) (AOAC-lignin) and the organic matter lost from the ligno-cellulose complex (represented by acid-detergent fibre) by oxidation with potassium permanganate. The AOAC-lignin concentration was twice the permanganate-lignin concentration, but the amount of lignin estimated by both methods showed a significant negative relation to organic-matter digestibility. The AOAC-lignin concentration was greater in Tr than in bm1 maize but the permanganate-lignin concentration in Tr was slightly lower than in bm1.5. There was an irregular relationship between the amount of lignin extractable with dimethylformamide (DMF) and digestibility of organic matter due to the solution of some of the DMF-lignin during digestion. The loss of lignin was greater from the mutant maize stalk tissue than from the parent maize stalk tissue.6. The chemical composition of DMF-lignin determined by analysis showed a significant correlation between the syringealdehyde, p-hydroxybenzaldehyde and vanillin concentrations, and digestibility of organic matter.7. Higher concentrations of both phenolic aldehydes and acids were found in the less digestible Tr material than in the bm1 stalk tissue.

scholarly journals Chemical, nutritive, fermentation profile and gas production of citrus pulp silages, alone or combined with maize silage

2020 ◽  
Vol 50 (1) ◽  
pp. 161-169
Author(s):  
İ Ülger ◽  
S.B. Beyzi ◽  
M Kaliber ◽  
Y Konca
Keyword(s):  
Organic Matter ◽  
Nutrient Content ◽  
Gas Production ◽  
Metabolizable Energy ◽  
Maize Silage ◽  
Crude Fibre ◽  
Citrus Pulp ◽  
Acid Detergent Fibre ◽  
Organic Matter Digestibility

Quality attributes of citrus pulp silages that were ensiled alone and combined with maize silage were determined. Fresh samples of lemon, orange and tangerine pulps, maize plants and their combinations were fermented in glass jars for 90 days at about 20 - 25 °C. Treatments included i) 100% maize silage as control (MS); ii) 100% lemon pulp silage (LPS); iii) 100% orange pulp silage (OPS); iv) 100% tangerine pulp silage (TPS); v) 50% LPS and 50% maize silage (LPS + MS); vi) 50% OPS and 50% MS; and vii) 50% TPS and 50% maize silage (TPS + MS). The pH differed among treatment groups. The highest and lowest pH values were recorded for MS group and the OPS + MS group, respectively (3.84 vs. 3.51). The highest dry matter (DM), crude fibre (CF), neutral detergent fibre (NDF), acid detergent fibre (ADF) and hemicellulose (HEM) were observed for MS (P <0.01). Citrus pulp silages alone had significantly greater total digestible nutrients (TDN), organic matter (OM) and non-fibre carbohydrate (NFC) values than MS and the combined silages (P <0.01). Maize silage had higher lactic acid (LA) (101.2 g/kg DM) and acetic acid (AA) (49.3 g/kg DM) concentrations than the citrus groups (P <0.05). In vitro gas production (TG), methane (CH4), metabolizable energy (ME) and organic matter digestibility (OMD) of the silages were similar (P >0.05). Thus, citrus pulps can be ensiled in spite of their moisture content. However, to increased DM and nutrient content, the citrus pulps should be ensiled with 50% maize. Keywords: fermentation metabolites, methane production, organic matter digestibility

scholarly journals Changes in the nutritive value and aerobic stability of corn silages inoculated with Bacillus subtilis alone or combined with Lactobacillus plantarum

2016 ◽  
Vol 56 (11) ◽  
pp. 1867 ◽  
Author(s):  
Erika C. Lara ◽  
Fernanda C. Basso ◽  
Flávia B. de Assis ◽  
Fernando A. Souza ◽  
Telma T. Berchielli ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacillus Subtilis ◽  
Chemical Composition ◽  
Lactobacillus Plantarum ◽  
Corn Silage ◽  
In Vitro Digestibility ◽  
Aerobic Stability ◽  
Organic Matter Digestibility ◽  
Corn Plants

Chemical composition, fermentation characteristics, in vitro digestibility and aerobic stability were evaluated in corn silage inoculated with microbial additives in two different experiments. Inoculant treatments (untreated, Bacillus subtilis and B. subtilis combined with Lactobacillus plantarum) were applied to fresh forages. Chopped corn plants (2B655 Hx) were ensiled in laboratory silos for periods of 7, 14, 21 and 63 days to evaluate the fermentation parameters. The experimental silos were weighed to determine gas losses. After the ensiling period, the silage was sampled to determine chemical composition and in vitro organic matter digestibility. To evaluate aerobic stability, chopped corn plants (AG‐1051) were ensiled in laboratory silos that were opened after 96 days of ensiling. The silage was placed in different buckets containing data loggers. The silage was sampled after 0, 4, 8 and 12 days of exposure to air to evaluate the microbial populations and pH. The data were analysed as a completely randomised design using a mixed repeated-measures model in the MIXED procedure of SAS. To evaluate each treatment relative to the fermentation times, a regression analysis using the PROC REG procedure of SAS was applied. A significance level of P < 0.05 was used. Inoculation with both strains increased lactic acid concentration, whereas the use of B. subtilis alone or combined with L. plantarum improved in vitro apparent organic matter digestibility. In the B. subtilis and B. subtilis combined with L. plantarum silages, moulds and yeasts decreased, and aerobic stability was improved. Inoculation with B. subtilis alone or combined with L. plantarum improved the nutritional value and aerobic stability of corn silage.

scholarly journals The effect of the stage of maturity of alfalfa (Medicago sativa L.) on the chemical composition and in sacco digestibility

2008 ◽  
Vol 56 (1) ◽  
pp. 55-64 ◽  
Author(s):  
Petr Doležal ◽  
Jiří Skládanka
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Negative Correlation ◽  
Crude Protein ◽  
Fibre Content ◽  
Crude Fibre ◽  
Nitrogenous Substances ◽  
Organic Matter Digestibility ◽  
Crude Fibre Content ◽  
In Sacco

The influence of the stage of maturity of alfalfa on the chemical composition and in sacco digestibility was studied in a laboratory experiment. Alfalfa plants were analysed in 8 vegetation stages harvested in regular intervals before the beginning of bud setting until the fall of blossoms. The contents of nitrogenous substances, fat, crude fibre, ADF, NDF, Ca, P, Na, K and Mg were determined in the samples, and using the in sacco method also the organic matter digestibility in the rumen. Further we assessed the energy content and calculated the N−free extractives (BNLV) value. In some stages the chemical changes were monitored in the whole plant. It was discovered that during vegetation there was a statistically significant increase in the crude fibre content and in the ADF and NDF fractions and a reduction in nitrogenous substances. A strong negative correlation was detected between the stage of maturity of alfalfa and content of crude protein and net energy for lactation (r = −0.97 and r = −0.92, respectively). In the individual stages of vegetation the differences in the content of nitrogenous substances, fibre and fat were statistically significant (P < 0.05). The statistically highest content of crude protein (28.97%) was detected in the first stage before bud setting and the lowest (11.97%) in the stage after the fall of blossoms. Later vegetation also had a stronger depressive effect on the content of fat and NEL. The organic matter digestibility (P < 0.05) was the lowest in alfalfa in the last stage of sampling (62.6%) when it reached a mere 85.99% of the digestibility at the beginning of bud setting. The highest organic matter digestibility (72.80%) was detected in a sample of young alfalfa prior to bud setting. In the experiment we confirmed a strong and negative correlation (r = −0.97) between the crude fibre content and organic matter digestibility. The correlation was also strong between the stage of maturity of alfalfa and the content of magnesium (Mg).

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