Meat Production in a Feedlot System of Zebu—Holstein Steers and Heifers with Dairy Genetics: Productive and Biological Analyses
Table 2
Intake in kg and g/kg live weight and nutrient digestibility in % of DM intake of steers and heifers with dairy origins in a feedlot.
Item
Sex
Period (days)
RSD
value
S
H
30
60
90
120
Sex
Period
LIN
Quad
CUB
Intake (kg/day)
DM
8.18
7.55
7.59
8.02
7.60
8.27
0.88
0.058
0.366
0.619
0.278
0.705
0.177
OM
7.87
7.27
7.32
7.72
7.29
7.95
0.85
0.058
0.364
0.619
0.300
0.667
0.169
CP
0.67
0.62
0.61
0.66
0.63
0.69
0.07
0.067
0.181
0.633
0.109
0.755
0.129
apNDF
2.05
1.87
2.13
2.23
2.22
1.26
0.22
0.040
<0.001
0.480
<0.001
<0.001
<0.001
EE
0.04
0.05
0.05
0.05
0.05
0.05
0.06
0.387
0.651
0.550
0.214
0.454
0.577
DOM1
5.48
5.01
4.87
5.39
5.08
5.65
0.65
0.054
0.133
0.554
0.069
0.928
0.116
TDNI
5.54
5.05
4.92
5.44
5.13
5.69
0.50
0.058
0.364
0.619
0.300
0.0339
0.166
DEI*
24.3
22.2
21.7
23.9
22.5
25.0
2.88
0.051
0.140
0.556
0.079
0.900
0.110
MEI*
18.5
18.2
17.8
19.6
15.5
20.5
3.85
0.831
0.046
0.338
0.519
0.255
0.015
FE*
0.12
0.11
0.16
0.10
0.11
0.10
1.51
0.190
<0.001
0.205
0.003
0.016
0.003
Intake (g/kg live weight)
DM
22.4
23.9
25.3
23.8
22.8
20.8
1.40
<0.001
<0.001
0.202
<0.001
0.607
0.455
OM
21.5
23.0
24.3
22.8
21.9
20.0
1.34
<0.001
<0.001
0.204
<0.001
0.692
0.487
apNDF
5.70
6.07
7.09
6.61
6.67
3.17
0.36
<0.001
<0.001
0.105
<0.001
<0.001
<0.001
Digestibility (% DM intake)
OM
69.6
68.8
66.4
69.7
69.6
70.9
2.58
0.418
<0.001
0.813
0.005
0.295
0.239
CP
66.2
63.0
65.9
65.5
61.1
65.9
5.12
0.097
0.198
0.825
0.623
0.166
0.113
apNDF
44.1
40.6
45.1
43.6
44.6
36.1
7.02
0.172
0.062
0.519
<0.001
0.186
0.285
EE
70.48
69.71
68.03
70.79
69.53
72.04
0.96
0.058
0.364
0.619
0.0240
0.0094
0.481
Sex (S = steer, H = heifer); 1DOM = digestible organic matter obtained through multiplication of intake and its digestibility; RSD = residual standard deviation; = effect of the interaction between sex and period; LIN = linear effect; QUAD = quadratic effect; CUB = cubic effect; *DEI and MEI in Mcal/d; FE = feed efficiency.
