Table 1 Fecal and urinary N content and C and N balance of Nellore cattle fed with sources of rumen undegradable protein during the finishing phase in feedlots.

From: Effects of rumen undegradable protein sources on nitrous oxide, methane and ammonia emission from the manure of feedlot-finished cattle

Variables

Treatments1

SEM2

p value

SM

BSM

CGM

RDP vs. RUP

BSM vs. CGM

Chemical composition

Feces

      

N, g kg−1 DM

33.6

33.2

34.9

0.5

0.444

0.012

C, g kg−1 DM

409.7

413.0

410.4

3.9

0.695

0.637

C/N

12.2

12.4

11.7

0.1

0.658

0.009

Urine

N, g kg−1 DM

5.1

6.1

5.6

0.8

0.419

0.669

C, g kg−1 DM

8.2

10.8

8.8

1.5

0.382

0.186

C/N

1.5

1.8

1.4

0.1

0.632

 < 0.001

N balance

N, g day−1

Intake

223.1

209.8

204.6

10.4

0.224

0.724

Fecal excretion

86.4

89.6

82.4

5.5

0.952

0.358

Urinary excretion

83.4

75.8

77.8

5.8

0.391

0.659

Total excretion

169.8

165.4

160.2

9.3

0.548

0.691

Total retention

53.3

44.3

44.4

5.4

0.194

0.995

N, % intake

Fecal N

38.7

42.7

39.8

1.2

0.101

0.097

Urinary N

37.6

36.0

38.5

2.3

0.913

0.450

N retention

23.7

21.2

21.7

2.2

0.428

0.886

N, % excretion

Urine

51.3

54.5

51.2

1.9

0.521

0.227

Feces

48.7

45.5

48.8

1.9

0.521

0.227

  1. 1SM = manure of animals fed soybean meal as a source of rumen degradable protein (RDP), BSM = manure of animals fed by-pass soybean meal as a source of rumen undegradable protein (RUP), CGM = manure of animals fed corn gluten meal as a source of RUP; 2SEM = standard error of the mean. Animal considered as an experimental unit (n = 9).
Back to article page