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Table 2 Daily protein intake of Dorper × thin-tailed Han crossbred ram lambs at ad libitum (AL) or restricted to 70% or 40% of AL intake1

From: Net protein and metabolizable protein requirements for maintenance and growth of early-weaned Dorper crossbred male lambs

 

Level of feed intake2

SEM

P 4

Items

AL

70%

40%

ADG, g

324.2a

189.1b

37.6c

19.3

<0.001

Initial SBW, kg

19.3

19.5

18.5

0.22

0.271

Final SBW, kg

29.9a

27.8a

20.4b

0.91

<0.001

OM intake, g/d

107.6a

84.2b

53.3c

4.37

<0.001

N intake, g/(kg SBW0.75 · d)

1.83a

1.43b

1.01c

0.08

<0.001

N retention, g/(kg SBW0.75 · d)

0.47a

0.29b

0.11c

0.03

<0.001

MP intake, g/(kg SBW0.75 · d)3

7.47a

7.49a

5.46c

0.18

<0.001

  1. 1ADG: average daily gain; SBW: shrunk body weight; MP: metabolizable protein
  2. 2Ad libitum or restricted to 70% or 40% of ad libitum of an identical diet
  3. 3Calculated from the ratio of MP supply to OM intake reported by Ma et al. [14]
  4. 4 a,b,cMeans bearing different superscripts differ (P < 0.05)
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Journal of Animal Science and Biotechnology

ISSN: 2049-1891