The relation between various energy parameters, chemical composition and digestibility of some pasture swards in a subtropical environment

1971 ◽  
Vol 11 (51) ◽  
pp. 397 ◽  
Author(s):  
H Jeffery
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Crude Protein ◽  
Dry Matter ◽  
Energy Content ◽  
Digestible Energy ◽  
Independent Variables ◽  
Energy Parameters ◽  
Normal Acid ◽  
Subtropical Environment

Results obtained from 45 sheep metabolism trials, involving 190 sheep periods, with 11 different pasture types were analyzed to determine equations for the prediction of energy content, energy digestibility and digestible energy content. Independent variables considered in the analyses were crude protein and normal acid fibre contents and dry matter, organic matter and normal acid fibre digestibilities. In all equations significant pasture type effects were detected. The importance of these effects are discussed with particular consideration of likely biases that may result and the errors of prediction associated with overall regressions. The regressions obtained in this study are compared with a number of others reported in the literature.

Energy values of whole lucerne (Medicago sativa) and of its stem and leaf fractions in immature and fully grown sheep

1985 ◽  
Vol 25 (4) ◽  
pp. 783 ◽  
Author(s):  
DE Margan ◽  
NM Graham ◽  
TW Searle
Keyword(s):  
Cell Wall ◽  
Organic Matter ◽  
Medicago Sativa ◽  
Crude Protein ◽  
Dry Matter ◽  
Energy Content ◽  
Metabolizable Energy ◽  
Published Data ◽  
Digestible Energy ◽  
Ad Libitum

Chopped lucerne hay (Medicago sativa) and a stem fraction derived from it were fed to two adult and two immature wethers ad libitum and at a level near maintenance. Energy, nitrogen, and carbon balances were measured during feeding and fasting. The hay contained 17% crude protein and 46% cell wall constituents (dry matter basis) and the stem, which was 53% of the total, contained 10% crude protein and 64% cell wall. Voluntary dry matter consumption rates of the hay (per kg 3/4) were 103 and 145 g/day by the adults and immatures, respectively; the corresponding values for the stem were 73 and 100 g/day. Maximum daily energy balances were 290-3 16 kJ/kg3/4 for the hay and approximately maintenance for the stem. With both ad libitum and restricted feeding, energy digestibility was higher for the hay (56- 63%) than for the stem fraction (45-51%). The metabolizable fraction of digestible energy was 78% at the low and 82% at the high level of feeding and tended to be greater with the stem than with the hay. At the lower feed intake, metabolizable energy was about 10 and 8 MJ/kg organic matter for whole lucerne and stem respectively. Net availability of metabolizable energy was 64 and 49% for maintenance and gain on the hay, compared with 53 and 34% on the stem. As estimated by difference, the energy values of leaf were: digestible energy, 76%; metabolizable energy, 77% of digestible energy or 12.4 MJ/kg organic matter; net availability of metabolizable energy, 78% for maintenance and 60% for gain. All these figures are for the adult sheep; the immature animals gave values that were lower to various degrees. Consideration of the present results together with published data for other samples of lucerne suggests that the use of equations based on study of grasses to predict the energy values of lucerne is likely to introduce significant bias. Equations for this limited set of data on lucerne are given, gross energy being related to crude protein content, metabolizable energy to crude fibre and net availability of metabolizable energy to metabolizable energy content.

Digestible energy of wheat and oat grains when fed to sheep

1971 ◽  
Vol 11 (53) ◽  
pp. 610 ◽  
Author(s):  
MC Nottle
Keyword(s):  
Organic Matter ◽  
Dry Matter ◽  
Energy Content ◽  
The Body ◽  
Wheat Grain ◽  
Crude Fibre ◽  
Digestible Energy ◽  
Dry Matter Digestibility ◽  
Gross Energy ◽  
Feeding Trials

In pen feeding trials with eight Merino wethers, digestion coefficients were estimated for rations of cereal chaff-wheat grain-oat grain mixture, and wheat grain and oat grain fed separately at two levels of intake. Digestion coefficients for wheat and oat grain fed at 675 g/day in a double crossover experiment were dry matter 89.4, 80.8 per cent, organic matter 90.1, 82.6 per cent, protein 82.3, 77.6 per cent, ether extract 84.1, 90.9 per cent, crude fibre 33.2, 59.9 per cent, nitrogen free extractives 93.2, 85.8 per cent, energy 88.1, 81.0 per cent, total digestible nutrients 91.6, 87.1 per cent, and starch equivalents 90.7, 85.7. When these grains were fed at 785 g/day there was about 10 per cent improvement in crude fibre digestibility for both grains and 1-2 per cent improvement for other estimations with oats but not with wheat. The gross energy content of the wheat and oat grains when fed at 675 g/day was 4407 and 4700 calories/g dry matter. The digestible energy of the wheat in calories/g dry matter and organic matter was 3869 � 30, 3933 � 30 and for oats 3791 � 59, 3910 � 61. When fed at 785 g/day these values for wheat were 3850 � 50,3911 � 51 and for oats 3796 � 34, 3913 � 51. A highly significant relationship was found between energy and dry matter digestibility which for wheat diets was Y = 1.074x 7.840. r = 0.993 (P<0.001), and for oats and the mixed diet of cereal chaff-oat grain-wheat grain, Y = 0.983x + 1.550. r = 0.996 (P<0.001) where Y = energy and X = dry matter digestibility and r = the coefficient of correlation. Because of the similar digestible energy content of, and the body weight gains of sheep on, these two grains it was concluded that under the present conditions these grains were equivalent weight for weight.

Gross energy levels in regrowths of six pasture species, and relations with digestibility and chemical composition

1974 ◽  
Vol 14 (66) ◽  
pp. 33 ◽  
Author(s):  
PJ Michell
Keyword(s):  
Chemical Composition ◽  
Lolium Perenne ◽  
White Clover ◽  
Crude Protein ◽  
Dry Matter ◽  
Energy Levels ◽  
Dactylis Glomerata ◽  
Digestible Energy ◽  
Dry Matter Digestibility ◽  
Gross Energy

Gross energy levels and energy digestibilities were determined on 80 single species pasture samples of known dry matter digestibility. Crude protein, ash and ether extract levels were also determined. The pastures consisted of regrowths of six species, Trifolium repens (White clover cv. Grasslands Huia), Lolium perenne x multiflorum (manawa ryegrass cv. Grasslands Manawa), Lolium (multiflorum x perenne) x L. perenne (ariki ryegrass cv. Grasslands Ari ki), Lolium perenne (perennial ryegrass cv. Tasmanian No. 1), Dactylis glomerata (currie cocksfoot cv. Currie) and Dactylis glomerata (apanui cocksfoot cv. Grasslands Apanui), harvested eight times between May 1969 and August 1970. The gross energy levels in pasture dry matter and pasture digestible organic matter were highest with white clover (means 4.64 and 4.98 K cal g-1) and lowest with the ryegrasses (4.50 and 4.80 K cal g-1). They were also higher in the winter (4.60 and 4.91), autumn (4.53 and 4.90) and spring (4.56 and 4.86), and lower in the summer (4.49 and 4.77). Relations between gross energy levels and chemical composition were weak. The strongest relation was with crude protein content (r = +0.41, P < 0.01). Relations of energy digestibility and digestible energy level in pasture dry matter, with dry matter digestibility had high correlations (r = +0.97, P < 0.01, and r = +0.92, P < 0.01) and were similar to previously published relations. However, seasonal differences occurred in both relations and, at low dry matter digestibilities, winter pasture had higher energy digestibilities and higher levels of digestible energy than spring-summer pasture. Species differences occurred in the latter relation and, at high dry matter digestibilities, white clover had higher levels of digestible energy than the grasses.

scholarly journals Comparative study of the nutritive values of the different varieties of rice straw

1970 ◽  
Vol 39 (1-2) ◽  
pp. 75-82 ◽  
Author(s):  
MM Rahman ◽  
MR Alam ◽  
MR Amin ◽  
NG Das
Keyword(s):  
Organic Matter ◽  
Rice Straw ◽  
Crude Protein ◽  
Dry Matter ◽  
Energy Content ◽  
Lignin Content ◽  
Metabolizable Energy ◽  
P Content ◽  
Acid Detergent Fibre ◽  
Key Words Rice

Bang. J. Anim. Sci. 2010, 39(1&2): 75-82 This study was conducted to investigate the nutritional quality. The Dry matter (DM), Organic matter (OM), Crude protein (CP), Acid detergent fibre (ADF), Neutral detergent fibre (NDF), lignin, Ca and P contents of Pajam, Nijershail, Kablabadam, BR 11, BINA 5 and BRRI 29 varieties of rice straw varied from 92.21 to 93.05%, 81.21 to 86.24%, 3.49 to 5.10%, 41.38 to 46.32%, 72.16 to 77.57%, 4.3 to 6.97%, 0.10 to 0.245% and 0.046 to 0.146%, respectively. The OM content in Nijershail was significantly higher (P<0.01) than Kablabadam, BR 11, BRRI 29, Pajam and BINA 5, respectively. The variety BRRI 29 contained significantly higher (P<0.01) CP content (5.1%) than BINA 5, BR 11, Pajam, Nijershail and Kablabadam, respectively. Significantly (P<0.01) higher NDF content was found in BR 11 (77.57%) followed by Kablabadam, Nijershail, Pajam, BRRI 29 and BINA 5, respectively. Acid deter gut Fibre (ADF) content was significantly (P<0.05) higher in Nijershail (46.32%) than Kablabadam, BR 11, BINA 5, Pajam and BRRI 29, respectively. Significantly (P<0.01) higher lignin content was found in BRRI 29 (6.97%) compared to Kablabadam, BINA 5, Pajam, Nijershail and BR 11, respectively. The Ca content in Pajam and BR 11 was significantly (P<0.01) higher (0.245%) than Nijershail, BRRI 29, Kablabadam and BINA 5, respectively. BRRI 29 contained significantly (P<0.01) higher P content (0.146%) compared to BINA 5, Pajam, Nijershail, Kablabadam and BR 11, respectively. Organic Matter (OM) digestibility, and ME content in BRRI 29 was significantly (P<0.01) higher followed Nijershail, BINA 5, Pajam, Kablabadam and BR 11, respectively. Straw of BRRI 29 is expected to provide more nutrients, digestible organic nutrients and metabolizable energy to ruminants. Key words: Rice straw; Chemical composition; Energy content; Digestibility DOI: http://dx.doi.org/10.3329/bjas.v39i1-2.9679 Bang. J. Anim. Sci. 2010, 39(1&2): 75-82

The nutritive value of wheat and oat silages ensiled on three cutting dates

1993 ◽  
Vol 121 (2) ◽  
pp. 233-240 ◽  
Author(s):  
P. C. Garnsworthy ◽  
D. T. Stokes
Keyword(s):  
Organic Matter ◽  
Crude Protein ◽  
Dry Matter ◽  
Maximum Yield ◽  
Monitoring Period ◽  
Digestible Energy ◽  
The Third ◽  
Digestible Organic Matter ◽  
Dead Material ◽  
Digestible Crude Protein

SUMMARYThe production of biomass and its partitioning into stem, leaf, ear and dead material were monitored weekly in crops of wheat and oats from 16 May 1990, which corresponded approximately to ear emergence in the wheat, until ensilage on 29 June, 7 July and 19 July 1990 using the Ag-Bag system. An enzyme/inoculant additive was used on both crops on each ensilage date, although a portion of oats was ensiled without additive on the first two cutting dates, giving a total of eight silages. Changes in rumen degradability of dry matter were assessed for both crops throughout the monitoring period using the synthetic fibre bag technique. The digestibilities of gross energy, modified acid detergent fibre, organic matter and crude protein were determined in vivo using sheep.Over the total period of monitoring, the daily rates of increase in dry matter (DM) yield were 15·1 (± 1·6) and 16·5 (±1·9) g DM/m2 for wheat and oats respectively. From 29 June to 19 July the rates of increase were 11·3 (± 3·1) and 23·1 (±6·0) g DM/m2. The increase in weight of the ears accounted for almost all of this increase and, by the end of the monitoring period, the ears contributed approximately half of the dry matter of each crop. In both crops the portion of dead material was small until 19 July, when there was a rapid increase in the amount of dead stem. The DM content of both crops remained < 30% up to day 33 (18 June) but increased from c. 33% to c. 52% between days 53 and 65 (8–20 July). Rumen degradability of both crops decreased rapidly from c. 66% on 16 May until 16 June, when it was c. 56% for wheat and 55% for oats; it remained constant at these values thereafter.For silages made on the three successive ensilage dates, there was an increase in DM and starch contents but decreases in digestible energy, digestible fibre and digestible crude protein contents. Digestible organic matter was similar for the first two ensilage dates but lower in silage made on the third date.The use of an additive with the oat crop resulted in decreases in the digestible energy, digestible organic matter and digestible crude protein contents of the silages compared with untreated oats.Maximum yield of DM from wheat (18·6 t/ha) was obtained with the third cutting date, but optimum yield of energy (170 GJ/ha) and digestible crude protein (746 kg/ha) were found at the second cutting date. For oats, maximum yield of DM (17·3 t/ha) was again found with the third cut and maximum yield of energy (159 GJ/ha, untreated; 140 GJ/ha with additive) with the second cut. Digestible crude protein yield was greatest with the second cut of oats when no additive was used (708 kg/ha) but with additive it was greatest with the first cut (661 kg/ha).It was concluded that, under these conditions, the optimum date for ensilage of wheat or oats was 7 July and that the use of the additive was detrimental to the quality of the oat silage.

scholarly journals Chemical composition and in vitro digestibility of some range plants

2021 ◽  
pp. 094-098
Author(s):  
Musa Tibin Musa Ahmed
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Protein Content ◽  
Crude Protein ◽  
Dry Matter ◽  
In Vitro Digestibility ◽  
Maturity Stage ◽  
Legume Species ◽  
Significant Difference

This study was carried out to determine chemical composition and in vitro dry matter and organic matter digestibility of range plant species of the area. Samples were collected from range lands at full maturity stage, dried under shade and subjected to chemical analysis and dry matter and organic matter in vitro digestibility for Vigna sunhum, Andropogan gayanus, Pennisetum Pedicelatum, Shoenfeldia gracilis and Stylothanis flavicans were determined. The data was analyzed via analysis of variance and differences among means were determined using Least Significant Difference (LSD) test. The results showed that the legumes (Vigna sunhum and Stylothanis flavicans) were significantly higher (P≤0.01) in their crude protein content and the percentage of crude protein respectively was 13.4% and 10.00% while the grasses were significant (P≤0.05) higher in Crude Fibre (CF), ash, Acid Detergent Fibers (ADF) and Neutral Detergent Fibers (NDF). Crude fiber % values were 41.78, 43.37 and 46.07% for Pennisetum Pedicelatum, Andropogan gayanus and Shoenofeldia gracilis, respectively. The acid detergent values were 53.85, 47.74 and 53.39 for the three weeds. (P≤0.05), while the ratio of neutral detergent was significantly higher (P≤.05) in grasses than in the two legume species; 87.22, 82.35 and 88.99% for the three grasses respectively. Similarly higher in vitro dry matter and organic digestibility coefficients were obtained from legume species than grasses. The study concluded that, the studied grasses were higher in fiber content and lower in their protein content but, legumes grasses (Vigna sunhum, Pennisetum Pedicelatum and Stylothanis flavicans) had high nutritive value and in vitro digestibility which may provide ruminants with the needed protein and energy.

The effect of concentrate level on the intake of grass silages by ewes in late pregnancy

1989 ◽  
Vol 48 (1) ◽  
pp. 109-120 ◽  
Author(s):  
R. J. Orr ◽  
T. T. Treacher
Keyword(s):  
Organic Matter ◽  
Crude Protein ◽  
Dry Matter ◽  
Late Pregnancy ◽  
Metabolizable Energy ◽  
Fresh Weight ◽  
Replacement Rate ◽  
Digestible Energy ◽  
Concentrate Level

ABSTRACTIn two experiments, six silages were offered either alone or with constant daily levels of a barley-based concentrate (450 or 900 g fresh weight per ewe) to Finn Dorset ewes carrying between one and four foetuses in the last 6 weeks of pregnancy. The silages (SI to S3, experiment 1 and S4 to S6, experiment 2) had dry matter (DM) concentrations of 256, 190, 278 and 294, 216, 201 g/kg fresh weight and crude protein (CP) concentrations of 106, 164, 212 and 119, 148, 194 g/kg DM. Mean metabolizable energy (ME) concentrations of the silages (digestible energy × 0·81), in weeks 16 and 20, were 9·2, 10·3, 12·0 and 8·8, 10·9, 11·0 MJ/kg DM. Total ME intakes were 12·6, 13·5, 18·6 and 14·5, 15·1, 16·8 MJ/day in week 16 of gestation and were 11·6, 11·2, 17·2 and 12·2, 11·8, 13·3 MJ/day in week 20. Total ME intakes were increased by offering higher levels of concentrates and for levels of 0, 450 or 900 g/day these were 12·3, 14·8, 17·9 MJ/day in week 16 and 9·6, 12·8, 15·5 MJ/day in week 20. Intakes were similar for ewes carrying twins or multiples in experiment 1, but in experiment 2, intakes by ewes with twins or multiples were proportionately 0·97 and 0·85 of those for ewes with singles. Replacement rates of forage by concentrates were —0·09, —0·08, —0·60 and —0·06, —0·25, —0·38 g silage organic matter (OM) per g concentrates OM for silages SI to S3 and S4 to S6. Only on silage S6 did the replacement rate differ significantly from zero.

scholarly journals Nutritive value and digestibility of macronutrients from sheep and alpaca skin hydrolysates as a new alternative in juvenile rainbow trout (Oncorhynchus mykiss) feeding

2020 ◽  
Vol 23 (1) ◽  
Author(s):  
Marcelino Jorge Araníbar-Araníbar ◽  
Bernardo Roque-Huanca ◽  
Harnold Segundo Portocarrero-Prado ◽  
Francisco Halley Rodríguez-Huanca ◽  
María del Pilar Blanco-Espezúa ◽  
...  
Keyword(s):  
Organic Matter ◽  
Rainbow Trout ◽  
Crude Protein ◽  
Dry Matter ◽  
Nutritive Value ◽  
Stocking Density ◽  
Quality Parameters ◽  
Apparent Digestibility ◽  
Digestible Energy ◽  
Juvenile Rainbow Trout

Abstract Background The protein source from fish meal is very important in trout feeding, but it is expensive and very scarce. Alternative nutrient sources are required to achieve sustainability as trout production rapidly grows in Peru. The objective of this research was to determine the proximate chemical composition and the apparent digestibility coefficient (ADC) of dry matter, organic matter, crude protein, crude fat, and digestible energy of hydrolyzed sheep (HSS) and alpaca (HSA) skins in juvenile rainbow trout. Methods A total of 450 fishes were randomly distributed in nine digestibility tanks, with 60.0 ± 1.32 g of initial weight and 6.4 kg/m3 of stocking density. The water quality parameters were as follows: pH 8.4, temperature 11.5 °C, and dissolved oxygen 6.2 mg/l. The skin hydrolysates were treated at 130 °C with 15 psi pressure for 120 min. Fish were fed a reference diet and an experimental diet containing 70% reference diet and 30% skin hydrolysate. The ingredients of the diets were mixed and then extruded at 95 °C with 4-mm diameter (Extruder Khal® EE800). The ADC was determined by the indirect method using insoluble ash as a non-digestible marker. Results The ADC in HSS and HSA was similar for dry matter (67.7 vs 69.1%), organic matter (66.9 vs 68.2%), crude protein (70.4 vs 70.1%), and digestible energy (3.35 vs 3.24 Mcal/kg DM), but crude fat values were different (12.3 vs 48.0%; p < 0.001, respectively). Conclusion The hydrolyzed sheep and alpaca skins had a high content of macronutrients with an acceptable apparent digestibility of nutrients, making them a viable alternative to improve the nutritive value of more economical feeds for rainbow trout feed.

scholarly journals Comparative study on the biomass yield, chemical composition and in-sacco dry matter degradability of different cultivars of triticale fodder

2012 ◽  
Vol 41 (1) ◽  
pp. 24-28
Author(s):  
MK Zannat ◽  
MR Alam ◽  
NR Sarker ◽  
KS Huque ◽  
MRI Khan ◽  
...  
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Crude Protein ◽  
Dry Matter ◽  
Biomass Yield ◽  
Neutral Detergent Fibre ◽  
Fodder Production ◽  
P Content ◽  
Acid Detergent Fibre ◽  
In Sacco

An experiment was conducted to determine the biomass yield, chemical composition and in-sacco dry matter (DM) degradability of 10 cultivars (WRF-7, TSN-111, TYT-03, TYT-05, TYT-06, TYT-08, TYT-12, ITYN-10, ITYN-14 and ITYN-15) of triticale fodder. The fresh yield of different cultivars of triticale was ranged from 5.03 to 6.85 (t/ha). The organic matter (OM), crude protein (CP), acid detergent fibre (ADF), neutral detergent fibre (NDF), calcium (Ca) and phosphorus (P) contents of different cultivars of triticale were found 89.62 to 91.78 %, 21.34 to 25.99 %, 23.09 to 29.99 %, 46.77 to 50.80 %, 0.42 to 0.61 % and 0.33 to 0.41 %, respectively. The yield of DM and CP of different cultivars of triticale were varied from 0.77 to 1.44 (t/ha) and 0.193 to 0.351 (t/ha), respectively. Among different triticale cultivars the highest OM and CP contents were found in TYT-12 (91.78 %) and ITYN-10 (25.99 %), respectively. The highest NDF and ADF contents were found in ITYN-14 (50.80 %) and TYT-05 (29.99 %), respectively among different cultivars. The contents of Ca and P in ITYN-10 (0.61 %) and ITYN-14 (0.41 %), respectively were found to be the highest among the cultivars. Potential DM degradability observed in different cultivars of triticale was higher in ITYN-14 and TYT-05 (84.81 and 81.88 %, respectively) compared to others and relatively poor degradability was found in TSN-111 and TYT-03 (60.74 and 61.35 %, respectively). Therefore, it may be concluded that, the cultivar ITYN-10 will be the promising one due to comparatively higher fresh yield, organic matter (OM), crude protein (CP), neutral detergent fibre (NDF), calcium (Ca) and phosphorus (P) content and less acid detergent fibre (ADF) fraction cultivated for fodder production in Bangladesh.http://dx.doi.org/10.3329/bjas.v41i1.11972 

NEAR INFRARED REFLECTANCE SPECTROSCOPY FOR PREDICTING FORAGE COMPOSITION AND VOLUNTARY CONSUMPTION AND DIGESTIBILITY IN CATTLE AND SHEEP

1986 ◽  
Vol 66 (1) ◽  
pp. 103-115 ◽  
Author(s):  
E. S. REDSHAW ◽  
R. D. WEISENBURGER ◽  
G. W. MATHISON ◽  
L. P. MILLIGAN
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Near Infrared ◽  
Energy Content ◽  
Neutral Detergent Fiber ◽  
Infrared Reflectance ◽  
Near Infrared Reflectance ◽  
Digestible Energy ◽  
Voluntary Intake ◽  
Cattle And Sheep

Near infrared reflectance spectroscopic (NIR) measurements were made on 82 samples of legume (alfalfa and clover), grass (brome, timothy, reed canary grass and meadow foxtail) and legume-grass mixtures using a Neotec model 6100 scanning monochromator. Data on the forages, used for establishing NIR calibrations for predictive relationships and appraising them, were chemical composition and measurements of digestibility and voluntary consumption for cattle and sheep. The primary wavelengths selected by multiple regression techniques were similar to those obtained by other researchers for crude protein, acid and neutral detergent fiber, calcium and phosphorus. Similar primary wavelengths were selected for prediction of digestibility and voluntary intake (g kg−0.75) of forages for cattle and sheep, but those selected for voluntary intake on the basis of percentage of body weight differed between animal species. The wavelengths which best predicted animal intake and digestibility in our trials differed from those reported by other researchers. Crude protein, acid detergent fiber, neutral detergent fiber, lignin, acid detergent insoluble nitrogen, calcium, phosphorus and ash concentrations in forage were predicted with standard errors of 1.0, 2.2, 2.9, 1.1, 0.07, 0.15, 0.02, and 1.2%, respectively. The accuracy of predictions for these chemical constituents was similar to that reported by other workers. Digestible energy content, dry matter digestibility, voluntary intake and digestible energy intake of hays by cattle were predicted with standard errors of prediction of 0.59 MJ kg, 2.4%, 7.6 g DM kg−0.75, and 79 kJ kg−0.75, respectively. Corresponding values for sheep were 0.96, 4.4, 6.3 and 128. The quantitative importance of variability in animal data in the calibration of the NIR procedure was discussed. This variability accounted for about one-half of the variability of NIR prediction of voluntary DM and digestible energy intake of cattle. This proportion was reduced to approximately one-quarter and one-sixth for digestibility of dry matter and digestible energy content of feed, respectively. Key words: Cattle, sheep, forages, near infrared reflectance spectroscopy, nutritive value

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