Intake, retention time in the rumen and microbial protein production of Bos indicus steers consuming grasses varying in crude protein content

2010 ◽  
Vol 50 (6) ◽  
pp. 444 ◽  
Author(s):  
T. Panjaitan ◽  
S. P. Quigley ◽  
S. R. McLennan ◽  
T. Swain ◽  
D. P. Poppi
Keyword(s):  
Protein Content ◽  
Retention Time ◽  
Crude Protein ◽  
Bos Indicus ◽  
Crude Protein Content ◽  
Microbial Protein ◽  
Neutral Detergent Fibre ◽  
Tropical Forage ◽  
Ryegrass Hay ◽  
The Difference

Feed intake, rumen function, microbial protein (MCP) production and the efficiency of MCP production were determined in steers fed four different forage hays varying markedly in crude protein content. Low quality tropical forage (speargrass and Mitchell grass) hays had lower crude protein content, higher neutral detergent fibre content and lower digestibility than a medium quality tropical forage (pangola grass) hay and a temperate forage (ryegrass) hay. Steers fed speargrass and Mitchell grass hays had lower MCP production (80 and 170 g MCP/day, respectively) and efficiency of MCP production [78 and 79 g MCP/kg digestible organic matter (DOM), respectively] than steers fed pangola grass (328 g MCP/day; 102 g MCP/kg DOM) and ryegrass (627 g MCP/day; 135 g MCP/kg DOM) hays, which was directly related to the supply of DOM and rumen degradable protein. Intake was greatest for ryegrass hay, followed by pangola grass, Mitchell grass and speargrass hays [17.6, 15.6, 10.1 and 5.5 g DM/kg W.day, respectively]. The retention time of DM in the rumen was 72.1, 47.7, 28.6 and 19.1 h for speargrass, Mitchell grass, pangola grass and ryegrass hays, respectively, with a similar trend apparent for the retention time of neutral detergent fibre, lignin, chromium-EDTA and ytterbium labelled digesta. The difference in the protein : energy ratio of absorbed substrates (measured as efficiency of MCP production) did not appear to account for all the differences in intake, nor did a purely physical mechanism.

Evaluation of a long-established silvopastoral Brachiaria decumbens system: plant characteristics and feeding value for cattle

2019 ◽  
Vol 70 (9) ◽  
pp. 814 ◽  
Author(s):  
Marina A. Lima ◽  
Domingos S. C. Paciullo ◽  
Fabyano F. Silva ◽  
Mirton J. F. Morenz ◽  
Carlos A. M. Gomide ◽  
...  
Keyword(s):  
Protein Content ◽  
Crude Protein ◽  
Nutritive Value ◽  
Production Systems ◽  
Crude Protein Content ◽  
Brachiaria Decumbens ◽  
Dairy Heifers ◽  
Feeding Value ◽  
Signal Grass ◽  
The Difference

One of the main challenges of using a silvopastoral system (SPS) is maintaining pasture and animal productivity over time. Our objective was to compare the productive characteristics and nutritive value of signal grass (Brachiaria decumbens cv. Basilisk) and the liveweight gain of dairy heifers in a SPS and open pasture (OP, signal grass under full sunlight) during the rainy seasons of four experiments between 2003 and 2016, which characterised systems from their 6th to 19th years after establishment in south-eastern Brazil when analysed together. The experimental design was a randomised complete block in a 2 × 4 factorial scheme (two production systems (SPS and OP) and four experiments (2003–2004, 2004–2007, 2011–2014 and 2014–2016)). From the 7th year onwards, the progressive reduction of photosynthetically active radiation negatively impacted the productive characteristics of the SPS pasture. Total forage mass was reduced by 19% in SPS compared with the OP in 2004–2007, 38% in 2011–2014 and 31% in 2014–2016. Crude protein content was 23% and 30% higher in the SPS than in the OP in 2011–2014 and 2014–2016, respectively. However, during the study period (until the 19th year), the liveweight gain of heifers was similar between systems since the higher crude protein content available in SPS contributed to improved forage nutritional value. From the 17th to the 19th year, weight gain per area was lower in the SPS compared with the OP (169 vs 199 kg ha–1), although the difference between systems was small. Signal grass presents a high degree of phenotypic plasticity in response to changes in shade levels, which gives this species a high potential for use in SPS.

The apparent digestibility of crude protein by the ruminant: III. The application of the general equation to rations containing urea

1957 ◽  
Vol 48 (3) ◽  
pp. 384-386 ◽  
Author(s):  
M. H. French
Keyword(s):  
Protein Content ◽  
General Equation ◽  
Crude Protein ◽  
Dry Matter ◽  
Ammonium Salts ◽  
Apparent Digestibility ◽  
Crude Protein Content ◽  
Microbial Protein ◽  
Urea Nitrogen

The digestibility of the crude-protein equivalent (N × 6·25) of rations containing urea conforms with the general equation, y = 70 log x − 15, correlating the dry-matter crude-protein content (x) with its coefficient of digestibility (y), irrespective of whether the urea nitrogen is absorbed as ammonium salts or converted to microbial protein prior to digestion.

Nitrogen fertiliser effects on nutritive characteristics of perennial ryegrass during late autumn, and mid- and late winter in western Victoria

2002 ◽  
Vol 42 (5) ◽  
pp. 541 ◽  
Author(s):  
J. L. Jacobs ◽  
F. R. McKenzie ◽  
G. A. Kearney
Keyword(s):  
Protein Content ◽  
Perennial Ryegrass ◽  
Crude Protein ◽  
Dry Matter ◽  
Water Soluble ◽  
Nitrate Content ◽  
Crude Protein Content ◽  
Nitrogen Fertiliser ◽  
Neutral Detergent Fibre ◽  
Metabolisable Energy

A study determined the effects of differing rates of nitrogen fertiliser [0 (N0), 25 (N1), 50 (N2) and 75�kg N/ha (N3)] during late autumn (T1) and mid- (T2) and late (T3) winter on the nutritive characteristics of perennial ryegrass over a 28-day period after each application. All nitrogen applications were made to pastures with a post-grazed residual mass (dry matter) of 1400 kg/ha. Changes in metabolisable energy followed similar patterns for all treatments within a given period. Metabolisable energy was highest in T1, ranging from 11.8 to 13.1 MJ/kg dry matter, followed by T2 (11.5-12.3 MJ/kg dry matter) and T3 (10.6-11.5 MJ/kg dry matter). Changes in crude protein for all treatments at each application time were similar, irrespective of rate of nitrogen application. At the commencement of treatment application times, the existing crude protein content (%DM) was highest in N3 (T1�19, T2 23, T3 22), followed by N2 (T1 18, T2 21, T3 21), N1 (T1 17, T2 20, T3 20) and N0 (T1 16, T2 17, T3 18). During both T1 and T2, neutral detergent fibre content decreased by 4 percentage units and increased by a similar amount during T3. Generally, neutral detergent fibre content (%DM) was highest during T3 (53-58%), followed by T2 (45-54%) and T1 (43-49%). Water-soluble carbohydrate content (%DM) increased during all treatment periods with the highest level observed during T1 (18-31%) followed by T2 (3-14%) and T3 (1-6%). Nitrate content (measured as nitrate-nitrogen) decreased throughout T1, primarily due to dry conditions, while during T2, levels for N3 and N2 were significantly (P<0.05) higher than for N1 and N0 following nitrogen fertiliser application. During T3, nitrate content increased for all treatments throughout the 28-day period, with highest nitrate levels being observed during T3. The effect of applied nitrogen on mineral content was variable within and across treatment periods. The study indicates that nitrogen fertiliser did not affect metabolisable (apart from N3 elevating metabolisable energy during T3), neutral detergent fibre or water-soluble carbohydrate contents of perennial ryegrass during the 28 days after nitrogen application, but increased crude protein content. Also, nitrogen fertiliser elevated nitrate content in perennial ryegrass. While the elevated nitrate content observed may result in subclinical effects, these levels are not considered fatal for dairy cows. Crude protein content was generally above 20% of dry matter throughout the study and close to 30% of dry matter for short periods during T2. Minimising the effect of excess nitrogen ingested by the grazing animal may require appropriate supplementation of low crude protein containing feeds such as cereal grains. It is argued that the effects of rain and temperature, which impact on soil nitrogen mineralisation, may have a greater influence on perennial ryegrass nitrate content than nitrogen fertiliser.

scholarly journals Agronomic bases of precision barley production

2012 ◽  
pp. 217-220
Author(s):  
Juliana Molnárová
Keyword(s):  
Protein Content ◽  
Crude Protein ◽  
Positive Impact ◽  
Research Station ◽  
Crude Protein Content ◽  
Soil Cultivation ◽  
Yield And Quality ◽  
Multifactor Experiment ◽  
Multifactor Analysis ◽  
The Difference

To ascertain the importance of individual preciosion factors in achieving yield and quality of malting barley, we established a multifactor experiment at the research station of the Slovak University of Agriculture in Nitra in 2009 and 2010. Four variants of fertilization, 2 ways of soil cultivation and four varieties 'Bojos’, 'Kangoo’, 'Marthe’ and 'Xanadu’ were observed. From the quality indicators the nitrogen content (%) was observed. The results were statistically analyzed by using a multifactor analysis of variance by using Statistica 8, the program Statgraphics. The difference between years was statistically significant (1.87 t ha-1) in favour of 2010. The difference was also significant between the varieties 'Bojos’ and ’Kangoo’(1.07 t ha-1), respectively. 'Martha’ and 'Xanadu’ as well as 'Kangoo’ (0.56 resp. 0.33 t ha-1). Conventional soil cultivation incomparison with a minimalization technology, demonstrated a  tatistically insignificant increase of yield. Significant differences were obtained between the variants of fertilization. Treatment by using Condit (b-var.) showed a very positive impact in climatic favorable year (2010) with a yield result of 7.42 t ha-1. In comparison with an untreated control, the difference in yield was 0.89 t ha-1. A significant increase of yield was achieved by using the combination of solid fertilizer with foliar fertilizer (LAV + Hakofyt, var.c) 0.47 t ha-1. The crude protein content was statistically influenced by a variety and year. In 2009, the crude protein content was above average (12.38%). Significantly lower attributes were achieved in 2010 (9.90%). From the studied/observed varieties the lowest crude protein content was showed by a variety 'Kangoo’ (1.68%).

Effects of growth-stage-based alfalfa harvest on weed encroachment and resultant quality

1999 ◽  
Vol 79 (2) ◽  
pp. 243-247 ◽  
Author(s):  
J. R. Moyer ◽  
J. Fraser ◽  
L. M. Rode ◽  
A. K. Topinka
Keyword(s):  
Protein Content ◽  
Key Words ◽  
Crude Protein ◽  
Growth Stage ◽  
Vegetative Stage ◽  
Crude Protein Content ◽  
Neutral Detergent Fibre ◽  
Yield And Quality ◽  
Acid Detergent Fibre ◽  
Cutting Management

Growth-stage-based alfalfa harvest treatments were imposed on a 2-yr-old Beaver alfalfa stand in 1992 to determine the effect of harvest treatments on yield and quality. By 1993, alfalfa cut at the vegetative stage or prebud stage contained 25% dandelions by weight. At these stages weeds lowered crude protein content in the total forage relative to pure alfalfa. Weed contents were similar and less than 1% by weight in forage cut at prebloom and later stages. Crude protein and fibre contents were similar in total forage and pure alfalfa at prebloom and later stages. Key words: Acid detergent fibre, crude protein, cutting management, dandelion, growth stage, neutral detergent fibre

Optimization of Medium for Bioconversion Extruded Apple Pomace into Microbial Protein

2021 ◽  
Author(s):  
Zhe Yang ◽  
Min Zhang ◽  
Lijun Jiang ◽  
Wenjing Suo ◽  
Yuxin Deng ◽  
...  
Keyword(s):  
Protein Content ◽  
Crude Protein ◽  
Nitrogen Sources ◽  
Geotrichum Candidum ◽  
Apple Pomace ◽  
Crude Protein Content ◽  
Microbial Protein ◽  
Microbial Utilization ◽  
True Protein ◽  
Extrusion Technology

Abstract The medium compositions such as carbon and nitrogen sources, moisture content and inorganic salt affected the microbial protein (MP) production. Imbalance of carbon-nitrogen ratio in apple pomace (AP) limited the microbial utilization. Hence, those conditions must be optimized to achieve maximum MP. In this work, AP was pretreated by extrusion technology to obtain extruded apple pomace (EAP). Subsequently, the medium compositions were optimized using Plackett-Burman design (PBD) and Box-Behnken design (BBD). PBD determined four significant factors (bran, glucose, packing quantity (PQ), water to material ratio (W/M)) out of the eight variables. The BBD results showed that optimal true protein content (10.42%), effective viable count (1.94×109 CFU/g) and crude protein content (18.73%) were achieved at bran 16.22%, glucose 8.09%, PQ 9.88 g and W/M 1.56. Compared with AP, the true protein and crude protein content of optimal fermented EAP (FEAP) were increased by 152% and 216%, respectively. According to fluorescence microscopy, the cellulose of AP was little effected by extrusion technology while was mostly degraded by mixed strains (Aspergillus niger, Candida utilis, Geotrichum candidum and Lactic acid bacteria). Combination of extrusion and fermentation, the medium compositions were optimized to promote the bioconversion of AP into MP feed.

The Role of the Operation Regime in Wastewater Treatment with Duckweed

1987 ◽  
Vol 19 (1-2) ◽  
pp. 97-105 ◽  
Author(s):  
Gideon Oron ◽  
Andre de-Vegt ◽  
Dan Porath
Keyword(s):  
Protein Content ◽  
Retention Time ◽  
Crude Protein ◽  
Dry Weight ◽  
Treated Wastewater ◽  
Secondary Treatment ◽  
Crude Protein Content ◽  
Protein Rich ◽  
Outdoor Experiments

The results of outdoor experiments with Lemnaqibba (a duckweed species) grown in mini-ponds proved to be highly competitive in comparison with other existing secondary treatment methods. The treated wastewater is at an acceptable level and can be reused for agricultural irrigation. The duckweed biomass, with a crude protein content of over 30% of dry weight, may be used as a protein rich alternative fodder. The ease of duckweed harvesting makes the potential treatment system even more economically attractive. Operational regime was controlled by the retention time and wastes depth. Retention time was in the range of 3 to 10 days, while the depths examined were 20 cm and 30 cm. The results indicate that shortening the retention time was associated with increase in protein content and did not affect the yield very much. The duckweed yield (dry basis) in the deep ponds (30 cm) was very similar to the 20 cm ponds, viz. around 14 g /m2 per day.

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