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NRC nutrient requirements table

 

From Nutrient Requirements of Sheep, Sixth Revised Edition (1985), Subcommittee on Sheep Nutrition, Committee on Animal Nutrition, Board on Agriculture, Nation Research Council, National Academy Press, Washington, D.C.  (posted with permission).

TABLE 2 Nutrient Concentration in Diets for Sheep (expressed on 100 Percent Dry Matter Basisa)

Body weight

Weight change per day

Energyb

Example diet proportions

         

TDNc

DE

ME

Concentrate

Forage

Crude protein

Calcium

Phosphorus

Vitamin A activity

Vitamin E activity

(kg)

(lb)

(g)

(lb)

%

(Mcal/kg)

(Mcal/kg)

%

%

%

%

%

(IU/kg)

(IU/kg)

Ewesd

Maintenance

70

154

10

0.02

55

2.4

2.0

0

100

9.4

0.20

0.20

2,742

15

Flushing-2 weeks prebreeding and first 3 weeks of breeding

70

154

100

0.22

59

2.6

2.1

15

85

9.1

0.32

0.18

1,828

15

Nonlactating-First 15 weeks gestation

70

154

30

0.07

55

2.4

2.0

0

100

9.3

0.25

0.20

2,350

15

Last 4 weeks gestation (130-150% lambing rate expected) or last 4-6 weeks lactation suckling singlese

70

154

180 (0.45)

0.40 (0.10)

59

2.6

2.1

15

85

10.7

0.35

0.23

3,306

15

Last 4 weeks gestation (180-225% lambing rate expected)

70

154

225

0.50

65

2.9

2.3

35

65

11.3

0.40

0.24

3,132

15

First 6-8 weeks lactation suckling singles or last 4-6 weeks lactation suckling twinse

70

154

-25 (90)

-0.06 (0.20)

65

2.9

2.4

35

65

13.4

0.32

0.26

2,380

15

First 6-8 weeks lactation suckling twins

70

154

-60

-0.13

65

2.9

2.4

35

65

15.0

0.39

0.29

2,500

15

Ewe Lambs

Nonlactating-First 15 weeks gestation

55

121

135

0.30

59

2.6

2.1

15

85

10.6

0.35

0.22

1,668

15

Last 4 weeks gestation (100-120% lambing rate expected)

55

121

160

0.35

63

2.8

2.3

30

70

11.8

0.39

0.22

2,833

15

Last 4 weeks gestation (130-175% Lambing rate expected)

55

121

225

0.50

66

2.9

2.4

40

60

12.8

0.48

0.25

2,833

15

First 6-8 weeks lactation suckling singles (wean by 8 weeks)

55

121

-50

0.22

66

2.9

2.4

40

60

13.1

0.30

0.22

2,125

15

First 6-8 weeks lactation suckling twins (wean by 8 weeks)

55

121

-100

-0.22

69

3.0

2.5

50

50

13.7

0.37

0.26

2,292

15

Replacement Ewe Lambsf

30

66

227

0.50

65

2.9

2.4

35

65

12.8

0.53

0.22

1,175

15

40

88

182

0.40

65

2.9

2.4

35

65

10.2

0.42

0.18

1,343

15

50-70

110-154

115

0.25

59

2.6

2.1

15

85

9.1

0.31

0.17

1,567

15

Replacement Ram Lambsf

40

88

330

0.73

63

2.8

2.3

30

70

13.5

0.43

0.21

1,175

15

60

132

320

0.70

63

2.8

2.3

30

70

11.0

0.35

0.18

1,659

15

80-100

176-220

270

0.60

63

2.8

2.3

30

70

9.6

0.30

0.16

1,979

15

Lambs Finishing-4 to 7 months oldg

30

66

295

0.65

72

3.2

2.5

60

40

14.7

0.51

0.24

1,085

15

40

88

275

0.60

76

3.3

2.7

75

25

11.6

0.42

0.21

1,175

15

50

110

205

0.45

77

3.4

2.8

80

20

10.0

0.35

0.19

1,469

15

Early Weaned Lambs-Moderate and rapid growth potentials

10

22

250

0.55

80

3.5

2.9

90

10

26.2

0.82

0.38

940

20

20

44

300

0.66

78

3.4

2.8

85

15

16.9

0.54

0.24

940

20

30

66

325

0.72

78

3.3

2.7

85

15

15.1

0.51

0.24

1,085

15

40-60

88-132

400

0.88

78

3.3

2.7

85

15

14.5

0.55

0.28

1,253

15

aValues in Table 2 are calculated from daily requirements in Table 1 divided by DM intake. The exception, vitamin E daily requirements /head, are calculated from vitamin E/kg diet x DM intake.

bOne kilogram TDN = 4.4 Mcal DE (digestible energy); ME (metabolizable energy) = 82% of DE. Because of rounding errors, values in Table 1 and Table 2 may differ.

cTDN calculated on following basis: hay DM, 55% TDN and on as-fed basis 50% TDN; grain DM, 83% TDN and on as-fed basis 75% TDN.

dValues are for ewes in moderate condition. Fat ewes should be fed according to the next lower weight category and thin ewes at the next higher weight category.

Once desired or moderate weight condition is attained, use that weight category through all production stages.

eValues in parentheses are for ewes suckling lambs the last 4-6 weeks of lactation.

fLambs intended for breeding; thus, maximum weight gains and finish are of secondary importance.

gMaximum weight gains expected.


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