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

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)
		Concentrate	Forage
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)

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.

Select Feedstuff (Concentrates and/or Forages)	Feedstuff	CP (g/g DM)	SolP (g/g CP)¹	SDP (g/g CP)²	k_d (/h)³	ADIP (g/g CP)⁴	DRUDP (g/g CP)⁵	NPCP (g/g SolP)⁶	ME (MJ/kg DM)⁷
Concentrate	Ammonium chloride	1.642	1.00	0.00		0.000	0.00	1.00	0
Concentrate	Apple pomace	0.063	0.25	0.61	0.035	0.315	0.00	1.00	10.42
Concentrate	Barley grain	0.138	0.25	0.70	0.350	0.050	0.00	0.29	12.72
Concentrate	Barley grain, rolled	0.124	0.3	0.61	0.23	0.04	0.05	0.29	12.72
Concentrate	Blood meal	0.955	0.10	0.61	0.019	0.010	0.28	0.00	10.00
Concentrate	Bone meal	0.132	0.18	0.48	0.072	0.000	0.34	0.00	16
Concentrate	Brewers spent grain	0.292	0.18	0.65	0.047	0.120	0.05	0.75	10.00
Concentrate	Canola meal	0.393	0.18	0.81	0.044	0.064	0	0.65	10.42
Concentrate	Casava chips (tapioca)	0.038	0.25	0.70	0.120	0.050	0.00	0.45	14.14
Concentrate	Chickpea	0.266	0.12	0.82	0.071	0.010	0.05	0.23	13.50
Concentrate	Coconut meal	0.213	0.28	0.65	0.087	0.030	0.04	0.75	11.34
Concentrate	Corn grain (ground)	0.094	0.24	0.73	0.049	0.032	0.00	0.73	13.31
Concentrate	Corn bran	0.119	0.45	0.49	0.070	0.005	0.06	0.80	12.27
Concentrate	Corn gluten meal	0.650	0.04	0.91	0.023	0.046	0.01	0.75	13.47
Concentrate	Cottonseed meal	0.449	0.26	0.56	0.068	0.040	0.15	0.40	11.34
Concentrate	Dried beet pulp	0.100	0.05	0.91	0.020	0.060	0.00	0.96	12.09
Concentrate	Faba bean seed	0.314	0.67	0.33	0.039	0.020	0.00	0.23	13.10
Concentrate	Feather meal	0.92	0.23	0.24	0.066	0.32	0.21	0.89	10.29
Concentrate	Fish meal	0.685	0.23	0.72	0.014	0.01	0.04	0	11.05
Concentrate	Grape skin cake	0.067	0.27	0.62	0.11	0.11	0	0.96	3.71
Concentrate	Groundnut cake	0.518	0.62	0.37	0.161	0.021	0.00	0.23	12.46
Concentrate	Lupin seed	0.345	0.30	0.67	0.261	0.034	0.00	0.68	11.80
Concentrate	Meat meal	0.576	0.35	0.40	0.060	0.032	0.22	0.27	11.34
Concentrate	Meat and bone meal	0.542	0.18	0.48	0.072	0.032	0.31	0.27	11.34
Concentrate	Molasses	0.085	0.74	0.26	0.032	0.000	0.00	1.00	10.88
Concentrate	Mustard oil cake	0.385	0.23	0.70	0.104	0.063	0.00	0.65	11.34
Concentrate	Oats	0.132	0.65	0.29	0.174	0.023	0.04	0.19	11.63
Concentrate	Palm kernel cake	0.194	0.24	0.7	0.07	0.097	0	0.75	12.09
Concentrate	Rice bran	0.155	0.33	0.49	0.050	0.026	0.16	0.80	10.59
Concentrate	Sorghum grain	0.116	0.19	0.79	0.055	0.086	0.00	0.33	12.38
Concentrate	Soybean hulls	0.141	0.23	0.72	0.062	0.072	0	0.72	12.09
Concentrate	Soybean meal	0.499	0.05	0.93	0.037	0.020	0.00	0.55	13.18
Concentrate	Soybean meal, formaldehyde treated	0.471	0.07	0.93	0.028	0.000	0.00	0.55	13.18
Concentrate	Soybean meal, heat-treated	0.463	0.09	0.91	0.02	0.01	0	0.84	13.18
Concentrate	Sunflower meal	0.284	0.42	0.53	0.292	0.049	0	1	10.23
Concentrate	Urea	2.880	1.00	0.00		0.000	0.00	1.00	0
Concentrate	Vetch bran	0.256	0.56	0.44	0.167	0.010	0.00	0.96	10.59
Concentrate	Wheat bran	0.173	0.34	0.63	0.200	0.081	0.00	0.75	10.59
Concentrate	Wheat middlings	0.185	0.4	0.54	0.15	0.03	0.03	0.75	13.39
Forage	Acacia macracantha leaves	0.224	0.30	0.62	0.030	0.021	0.07	0.90	1.66
Forage	Alfalfa hay	0.183	0.25	0.65	0.290	0.180	0.00	0.92	9.08
Forage	Alfalfa meal	0.192	0.28	0.66	0.067	0.125	0.00	1.00	9.25
Forage	Barley hay	0.125	0.22	0.60	0.080	0.093	0.09	0.93	8.74
Forage	Barley straw	0.043	0.47	0.27	0.12	0.257	0	0.95	6.07
Forage	Barley straw, urea treated	0.07	0.7	0.2	0.08	0.098	0	0.98	6.07
Forage	Bermudagrass hay	0.100	0.37	0.52	0.080	0.088	0.03	0.25	7.41
Forage	Casava peel silage	0.058	0.14	0.39	0.070	0.080	0.39	1.00	13.02
Forage	Chickpea straw	0.085	0.30	0.35	0.053	0.177	0.17	0.00	7.43
Forage	Clover hay	0.178	0.39	0.5	0.14	0.067	0.05	0.96	8.33
Forage	Corn silage	0.087	0.51	0.3	0.044	0.091	0.09	1	10.88
Forage	Corn stalks	0.041	0.20	0.66	0.040	0.136	0.00	0.95	9.96
Forage	Cottonseed hulls	0.041	0.30	0.35	0.053	0.177	0.17	0.00	6.36
Forage	Dehydrated alfalfa pellets	0.192	0.28	0.66	0.07	0.13	0	1	9.25
Forage	Flemingia macrophylla leaves	0.112	0.13	0.13	0.002	0.017	0.73	0.96	10.78
Forage	Gliricidia leaves	0.183	0.29	0.45	0.074	0.250	0.01	1.00	10.78
Forage	Grass hay	0.133	0.37	0.52	0.081	0.09	0.03	0.02	8.92
Forage	Grass hay, mixed	0.106	0.37	0.5	0.09	0.1	0.03	0.05	7.43
Forage	Grass silage	0.14	0.63	0.31	0.13	0.058	0.09	1	9.48
Forage	Groundnut (peanut) hulls	0.078	0.23	0.76	0.050	0.087	0.00	0.00	2.22
Forage	Guatemala grass	0.087	0.23	0.68	0.020	0.089	0.00	0.25	7.43
Forage	Guinea grass	0.094	0.06	0.57	0.073	0.089	0.28	0.25	7.43
Forage	Krishnachura leaves	0.145	0.18	0.60	0.028	0.200	0.02	0.92	10.78
Forage	Leucaena leaves	0.269	0.30	0.62	0.030	0.021	0.07	0.90	10.78
Forage	Mulberry (Morus alba) leaves	0.208	0.20	0.50	0.026	0.200	0.10	0.92	11.34
Forage	Napier grass	0.078	0.46	0.52	0.110	0.022	0.00	0.02	6.88
Forage	Oat hay	0.058	0.35	0.53	0.043	0.103	0.02	0.93	8.03
Forage	Oat/sorghum hay	0.093	0.32	0.53	0.05	0.1	0.06	0.94	8.18
Forage	Oaten chaff	0.091	0.35	0.53	0.04	0.07	0.05	0.93	5.31
Forage	Orchardgrass hay	0.130	0.25	0.69	0.110	0.061	0.00	0.96	8.16
Forage	Paragrass (Brachiaria mutica) hay	0.092	0.09	0.70	0.054	0.110	0.10	0.95	6.13
Forage	Peanut hay	0.171	0.39	0.50	0.140	0.099	0.02	0.96	8.36
Forage	Rhodesgrass hay	0.066	0.28	0.53	0.050	0.167	0.02	0.96	8.36
Forage	Rice straw (NaOH treated)	0.035	0.36	0.37	0.067	0.292	0.00	0.95	6.50
Forage	Rice straw (urea treated)	0.035	0.11	0.66	0.034	0.138	0.09	0.95	6.50
Forage	Rice straw	0.053	0.41	0.42	0.023	0.168	0.00	0.95	5.57
Forage	Sesbania grandiflora leaves	0.208	0.11	0.79	0.183	0.100	0.01	0.96	9.30
Forage	Sorghum-sudan hay	0.094	0.28	0.53	0.050	0.128	0.06	0.95	8.49
Forage	Sugar beet pulp silage	0.1	0.05	0.91	0.02	0.06	0	0.96	7.62
Forage	Sugar cane bagasse	0.030	0.03	0.49	0.049	0.315	0.17	0.96	4.83
Forage	Wheat straw	0.048	0.09	0.51	0.014	0.292	0.10	0.95	6.19
Mineral/Vitamin Supplement	Mineral/Vitamin Supplement	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0