E de la Garza Institute for Goat Research Langston University
DairyFiberMeatCurrent Research Langston University Research Building
Goat Menu
 

extension
extension
research
other
library
quiz
search
about
contact
faculty

bar  
      

Metabolizable Protein (MP) Intake Based on Estimates of Ruminally Undegraded Protein (UIP) and Microbial Protein Synthesis

Show/hide all text (hiding text will display calculator only)

In the other calculation procedures, a simple method has been used to convert requirements for MP into CP. This method involves the assumption that the conversion varies between 0.64 and 0.8 (i.e., 1 g CP is equivalent to between 0.64 and 0.8 g MP) for diets with CP being 100 to 0% degraded in the rumen. For most practical purposes when the dietary CP level is near the requirement, this should be adequate. However, it is more appropriate to base MP intake on the two major origins of amino acids absorbed in the small intestine (i.e., ruminally undegraded true protein and microbial true protein synthesized in the rumen and flowing to the small intestine). This is probably more important for instances in which diets very high in CP are consumed.

To use this method, characteristics of CP in the diet or individual feedstuffs in the diet are needed. Values for feedstuffs used by Luo et al. (2004a,b) and Nsahlai et al. (2004) are shown below. The dietary proportions are then used to determine average dietary values for these different characteristics. Other required inputs are dry matter (DM) intake, dietary concentrations of forage and concentrate, ME concentrations in forage and concentrate, and body weight (BW). The calculator is set up for input of the average concentrations in concentrate and forage. If mixtures of feedstuffs are used, the proportions of individual feedstuffs will need to be considered to derive average concentratins to be entered below. For mixtures with a large number of different ingredients, use of a spreadsheet might be a consideration. The calculator is set up so that more than one concentrate and more than one forage can be selected, with composition values being entered into the table below. However, this calculator is fitted with a pop-up window entitled "Input Selected Feed Ingredients Percentages to Determine Concentrate and Forage Values". After selecting feed ingredients, click on this button and enter the dietary levels of the various feedstuffs, then click on the "Calculate" button in the pop-up window and average concentrate and forage values will appear in the table below.

Example

Let's assume the following:
 
Body weight = 40 kg
DM intake = 1 kg
Concentrate = sorghum grain CP degradation characteristics, with a ME concentration of 12.38 MJ/kg DM, at 50% of the diet
Forage = bermudagrass hay CP degradation characteristics, with a ME concentration of 7.41 MJ/kg DM, at 50% of the diet
1. Enter BW (kg)
2. Enter DM intake (kg)
ConcentrateForage
3. Enter total dietary CP concentration (fraction, e.g., 0.12 or divide % DM by 100)
4. Enter soluble CP (g/g total CP)
5. Enter intact protein slowly degradable in the rumen (g/g total CP)
6. Enter rate of degradation of SDP (/h)
7. Enter acid detergent insoluble CP (g/g total CP)
8. Enter ruminally undegraded but intestinally digestible protein (g/g total CP). Calculated as the difference between total CP and the sum of SolP, SDP and ADIP
9. Enter non-protein CP (g/g SolP)
10. Enter dietary percentages of concentrate and forage (DM basis)
11. Enter ME concentration in concentrate/forage (MJ/kg)
To convert from English to metric system,
enter your values here.
They will be automatically entered into the table to the left.
BW
(lbs)
DM intake
(lbs)

To estimate the dietary ME concentration, often feed tags list the Total Digestible Nutrient (TDN) concentration. Likewise, most commercial feed laboratories estimate the TDN concentration based on various analyses, such as for crude protein and fiber fractions.

The ME concentration can be calculated with these simple formulas:
ME (MJ/kg) = TDN (%) × 0.15104 and
ME (Mcal/kg) = TDN (%) × 0.0361.

Enter TDN (%)
ME (MJ/kg)
ME (Mcal/kg)

Our example results in MP intake of 72.2 g or 7.22% of DM intake. Since the UIP concentration is 42.6% based on the formula: conversion of CP to MP = 0.64 + (% UIP 0.16), the predicted conversion of CP to MP is 0.708, which is very close to the value estimated from this example by dividing MP intake by total CP intake (i.e., 0.706).

Select Feedstuff
(Concentrates and/or Forages)
Feedstuff CP

(g/g DM)

SolP

(g/g CP)1

SDP

(g/g CP)2

kd (/h)3 ADIP

(g/g CP)4

DRUDP

(g/g CP)5

NPCP

(g/g SolP)6

ME (MJ/kg DM)7
ConcentrateAmmonium chloride 1.642 1.00 0.00   0.000 0.00 1.00 0
ConcentrateApple pomace 0.063 0.25 0.61 0.035 0.315 0.00 1.00 10.42
ConcentrateBarley grain 0.138 0.25 0.70 0.350 0.050 0.00 0.29 12.72
ConcentrateBarley grain, rolled0.1240.30.610.230.040.050.2912.72
ConcentrateBlood meal 0.955 0.10 0.61 0.019 0.010 0.28 0.00 10.00
ConcentrateBone meal 0.132 0.18 0.48 0.072 0.000 0.34 0.00 16
ConcentrateBrewers spent grain 0.292 0.18 0.65 0.047 0.120 0.05 0.75 10.00
ConcentrateCanola meal0.3930.180.810.0440.06400.6510.42
ConcentrateCasava chips (tapioca) 0.038 0.25 0.70 0.120 0.050 0.00 0.45 14.14
ConcentrateChickpea 0.266 0.12 0.82 0.071 0.010 0.05 0.23 13.50
ConcentrateCoconut meal 0.213 0.28 0.65 0.087 0.030 0.04 0.75 11.34
ConcentrateCorn grain (ground) 0.094 0.24 0.73 0.049 0.032 0.00 0.73 13.31
ConcentrateCorn bran 0.119 0.45 0.49 0.070 0.005 0.06 0.80 12.27
ConcentrateCorn gluten meal 0.650 0.04 0.91 0.023 0.046 0.01 0.75 13.47
ConcentrateCottonseed meal 0.449 0.26 0.56 0.068 0.040 0.15 0.40 11.34
ConcentrateDried beet pulp 0.100 0.05 0.91 0.020 0.060 0.00 0.96 12.09
ConcentrateFaba bean seed 0.314 0.67 0.33 0.039 0.020 0.00 0.23 13.10
ConcentrateFeather meal0.920.230.240.0660.320.210.8910.29
ConcentrateFish meal0.6850.230.720.0140.010.04011.05
ConcentrateGrape skin cake0.0670.270.620.110.1100.963.71
ConcentrateGroundnut cake 0.518 0.62 0.37 0.161 0.021 0.00 0.23 12.46
ConcentrateLupin seed 0.345 0.30 0.67 0.261 0.034 0.00 0.68 11.80
ConcentrateMeat meal 0.576 0.35 0.40 0.060 0.032 0.22 0.27 11.34
ConcentrateMeat and bone meal0.5420.180.480.0720.0320.310.2711.34
ConcentrateMolasses 0.085 0.74 0.26 0.032 0.000 0.00 1.00 10.88
ConcentrateMustard oil cake 0.385 0.23 0.70 0.104 0.063 0.00 0.65 11.34
ConcentrateOats0.1320.650.290.1740.0230.040.1911.63
ConcentratePalm kernel cake0.1940.240.70.070.09700.7512.09
ConcentrateRice bran 0.155 0.33 0.49 0.050 0.026 0.16 0.80 10.59
ConcentrateSorghum grain 0.116 0.19 0.79 0.055 0.086 0.00 0.33 12.38
ConcentrateSoybean hulls0.1410.230.720.0620.07200.7212.09
ConcentrateSoybean meal 0.499 0.05 0.93 0.037 0.020 0.00 0.55 13.18
ConcentrateSoybean meal, formaldehyde treated 0.471 0.07 0.93 0.028 0.000 0.00 0.55 13.18
ConcentrateSoybean meal, heat-treated 0.4630.090.910.020.0100.8413.18
ConcentrateSunflower meal0.2840.420.530.2920.0490110.23
ConcentrateUrea 2.880 1.00 0.00   0.000 0.00 1.00 0
ConcentrateVetch bran 0.256 0.56 0.44 0.167 0.010 0.00 0.96 10.59
ConcentrateWheat bran 0.173 0.34 0.63 0.200 0.081 0.00 0.75 10.59
ConcentrateWheat middlings0.1850.40.540.150.030.030.7513.39
ForageAcacia macracantha leaves 0.224 0.30 0.62 0.030 0.021 0.07 0.90 1.66
ForageAlfalfa hay 0.183 0.25 0.65 0.290 0.180 0.00 0.92 9.08
ForageAlfalfa meal 0.192 0.28 0.66 0.067 0.125 0.00 1.00 9.25
ForageBarley hay 0.125 0.22 0.60 0.080 0.093 0.09 0.93 8.74
ForageBarley straw0.0430.470.270.120.25700.956.07
ForageBarley straw, urea treated0.070.70.20.080.09800.986.07
ForageBermudagrass hay 0.100 0.37 0.52 0.080 0.088 0.03 0.25 7.41
ForageCasava peel silage 0.058 0.14 0.39 0.070 0.080 0.39 1.00 13.02
ForageChickpea straw 0.085 0.30 0.35 0.053 0.177 0.17 0.00 7.43
ForageClover hay0.1780.390.50.140.0670.050.968.33
ForageCorn silage0.0870.510.30.0440.0910.09110.88
ForageCorn stalks 0.041 0.20 0.66 0.040 0.136 0.00 0.95 9.96
ForageCottonseed hulls 0.041 0.30 0.35 0.053 0.177 0.17 0.00 6.36
ForageDehydrated alfalfa pellets0.1920.280.660.070.13019.25
ForageFlemingia macrophylla leaves 0.112 0.13 0.13 0.002 0.017 0.73 0.96 10.78
ForageGliricidia leaves 0.183 0.29 0.45 0.074 0.250 0.01 1.00 10.78
ForageGrass hay0.1330.370.520.0810.090.030.028.92
ForageGrass hay, mixed0.1060.370.50.090.10.030.057.43
ForageGrass silage0.140.630.310.130.0580.0919.48
ForageGroundnut (peanut) hulls 0.078 0.23 0.76 0.050 0.087 0.00 0.00 2.22
ForageGuatemala grass 0.087 0.23 0.68 0.020 0.089 0.00 0.25 7.43
ForageGuinea grass 0.094 0.06 0.57 0.073 0.089 0.28 0.25 7.43
ForageKrishnachura leaves 0.145 0.18 0.60 0.028 0.200 0.02 0.92 10.78
ForageLeucaena leaves 0.269 0.30 0.62 0.030 0.021 0.07 0.90 10.78
ForageMulberry (Morus alba) leaves 0.208 0.20 0.50 0.026 0.200 0.10 0.92 11.34
ForageNapier grass 0.078 0.46 0.52 0.110 0.022 0.00 0.02 6.88
ForageOat hay 0.058 0.35 0.53 0.043 0.103 0.02 0.93 8.03
ForageOat/sorghum hay0.0930.320.530.050.10.060.948.18
ForageOaten chaff0.0910.350.530.040.070.050.935.31
ForageOrchardgrass hay 0.130 0.25 0.69 0.110 0.061 0.00 0.96 8.16
ForageParagrass (Brachiaria mutica) hay 0.092 0.09 0.70 0.054 0.110 0.10 0.95 6.13
ForagePeanut hay 0.171 0.39 0.50 0.140 0.099 0.02 0.96 8.36
ForageRhodesgrass hay 0.066 0.28 0.53 0.050 0.167 0.02 0.96 8.36
ForageRice straw (NaOH treated) 0.035 0.36 0.37 0.067 0.292 0.00 0.95 6.50
ForageRice straw (urea treated) 0.035 0.11 0.66 0.034 0.138 0.09 0.95 6.50
ForageRice straw 0.053 0.41 0.42 0.023 0.168 0.00 0.95 5.57
ForageSesbania grandiflora leaves 0.208 0.11 0.79 0.183 0.100 0.01 0.96 9.30
ForageSorghum-sudan hay 0.094 0.28 0.53 0.050 0.128 0.06 0.95 8.49
ForageSugar beet pulp silage0.10.050.910.020.0600.967.62
ForageSugar cane bagasse 0.030 0.03 0.49 0.049 0.315 0.17 0.96 4.83
ForageWheat straw 0.048 0.09 0.51 0.014 0.292 0.10 0.95 6.19
Mineral/Vitamin SupplementMineral/Vitamin Supplement 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

1SolP = Soluble CP (g/g total CP).
2SDP = Slowly degradable protein (g/g total CP).
3kd = rate of degradation of SDP (/h).
4ADIP = acid detergent insoluble CP (g/g total CP).
5DRUDP = ruminally undegraded but intestinally digestible protein (g/g total CP). Calculated as the difference between total CP and the sum of SolP, SDP, and ADIP.
6NPCP = non-protein CP (g/g SolP). Derived from NRC (1996).
7ME = Metabolizable energy (MJ/kg)

    

MP intake (g):
MP intake (% DM):

Sources used in this calculation method are:

Luo, J., A. L. Goetsch, I. V. Nsahlai, T. Sahlu, C. L. Ferrell, F. N. Owens, M. L. Galyean, J. E. Moore, and Z. B. Johnson. 2004. Metabolizable protein requirements for maintenance and gain of growing goats. Small Ruminant Research 53:309-326.

Nsahlai, I. V., A. L. Goetsch, J. Luo, Z. B. Johnson, J. E. Moore, T. Sahlu, C. L. Ferrell, M. L. Galyean, and F. N. Owens. 2004. Metabolizable protein requirements of lactating goats. Small Rum. Res. 53:327-337.

NRC. 1996. Nutrient Requirements of Beef Cattle (7th Revised Edn.) National Academy Press, Washington, DC.