Dry matter intake and growth measurements
The results of DMI and growth measurements are summarized in Table 2. No differences in DMI (p=0.93) were found among the dietary treatment groups in the preweaning period (Table 2). However, calves those consumed calf starters had higher DMI compared to the control group. Greater DMI was observed when MOC in the starter was supplied, and the intake was 22.5% more than the control group. Calves fed SM, and MOCSM found almost similar quantities of DMI, which was 221 and 225 g/head/day, respectively. From the within-subjects test, it is indicated that there was a significant time effect (p<0.01) on the DMI of crossbred calves (Table 3). Furthermore, time significantly (p<0.01) impacted DMI in different groups in both linear and quadratic patterns (Table 4). The average BWG was found significantly different (p=0.02) in the control group than in the other three groups (Table 2). Feeding MOC improved BWG more significantly and was 1.73, 0.13, and 0.10 kg/day more than the control, SM and MOCSM groups. In the within-subjects test, the time effect was found to be significant (p≤0.01) on BWG (Table 3) both linearly (p<0.01) and quadratically (p=0.005) (Table 4).
Table 2. Dry matter intake, growth performance, and nutritional status indicators from calves fed control, mustard oil cake (MOC), soybean meal (SM), and a mixture of mustard oil cake and soybean meal (MOCSM) dietary groups
Parameters
|
Dietary groups
|
SEM
|
Between subjects-effects
P-value
|
Control
|
MOC
|
SM
|
MOCSM
|
DM intake and growth performance
|
DM intake (g/d)
|
195.05
|
238.98
|
220.87
|
224.27
|
49.43
|
0.93
|
BWG (kg) changes weekly
|
1.57b
|
3.33a
|
3.17a
|
3.20a
|
0.36
|
0.02
|
HGG (cm) changes weekly
|
1.58
|
2.06
|
1.94
|
1.97
|
0.14
|
0.17
|
BLG (cm) changes weekly
|
0.46a
|
1.51b
|
1.69b
|
1.60b
|
0.06
|
<0.01
|
WHG (cm) changes weekly
|
0.45a
|
1.74b
|
1.78b
|
1.82b
|
0.21
|
0.05
|
Nutritional status variables
|
Glucose (mmol/L)
|
6.20
|
5.34
|
6.95
|
6.64
|
0.91
|
0.63
|
Albumin (g/dL)
|
3.56b
|
4.72a
|
4.37ab
|
4.07ab
|
0.19
|
0.01
|
Serum urea (mg/dL)
|
15.42b
|
20.35a
|
18.87a
|
18.58a
|
0.43
|
<0.01
|
BUN (mg/dL)
|
7.21b
|
9.51a
|
8.82a
|
8.68a
|
0.19
|
<0.01
|
Calcium (mg/dL)
|
10.85b
|
13.63a
|
13.03ab
|
13.69a
|
0.55
|
0.02
|
Phosphorus (mg/dL)
|
5.03b
|
5.70a
|
5.84a
|
5.80a
|
0.15
|
0.01
|
|
|
|
|
|
|
|
|
|
|
DM, dry matter; BWG, body weight gain; HGG, heart-girth gain; BLG, body length gain; WHG, wither height gain; BUN, blood urea nitrogen; SEM, standard error of the mean. This means in a row with different superscripts (a, b) is statistically different.
Table 3. Tests of within subjects’ effects (sphericity assumed) on DM intake, growth performance and nutritional status of calves
Parameters
|
Source
|
F-value
|
P-value
|
DM intake
|
Time
Time × Group
|
47.57
0.47
|
<0.01
1.00
|
BWG
|
Time
Time × Group
|
8.35
1.35
|
<0.01
0.18
|
HGG
|
Time
Time × Group
|
4.18
1.53
|
0.001
0.10
|
BLG
|
Time
Time × Group
|
0.56
1.12
|
0.79
0.35
|
WHG
|
Time
Time × Group
|
2.36
1.29
|
0.03
0.22
|
Glucose
|
Time
Time × Group
|
2.13
2.04
|
0.15
0.12
|
Albumin
|
Time
Time × Group
|
16.97
1.99
|
<0.01
0.13
|
Serum urea
|
Time
Time × Group
|
26.09
3.64
|
<0.01
0.02
|
BUN
|
Time
Time × Group
|
26.07
3.63
|
<0.01
0.02
|
Calcium
|
Time
Time × Group
|
16.50
7.27
|
<0.01
0.001
|
Phosphorus
|
Time
Time × Group
|
17.36
3.27
|
<0.01
0.03
|
DM, dry matter; BWG, body weight gain; HGG, heart-girth gain; BLG, body length gain; WHG, wither height gain and BUN, blood urea nitrogen.
Table 4. Tests of within subjects’ contrast on DM intake, growth performance, and nutritional status
Parameters
|
P-value for time
|
P-value for time × dietary group
|
Linear
|
Quadratic
|
Linear
|
Quadratic
|
DM intake
|
<0.01
|
<0.01
|
0.87
|
0.87
|
BWG
|
<0.01
|
0.005
|
0.04
|
0.58
|
HGG
|
0.02
|
0.57
|
0.54
|
0.65
|
BLG
|
0.57
|
0.86
|
0.58
|
0.15
|
WHG
|
0.05
|
0.28
|
0.48
|
0.94
|
Glucose
|
0.34
|
0.06
|
0.17
|
0.22
|
Albumin
|
0.001
|
0.01
|
0.11
|
0.33
|
Serum urea
|
0.001
|
<0.01
|
0.09
|
0.01
|
BUN
|
0.001
|
<0.01
|
0.09
|
0.01
|
Calcium
|
0.001
|
0.15
|
0.004
|
0.11
|
Phosphorus
|
0.001
|
0.04
|
0.02
|
0.74
|
DM, dry matter; BWG, body weight gain; HGG, heart-girth gain; BLG, body length gain; WHG, wither height gain and BUN, blood urea nitrogen.
No effect was found on HGG among the groups (p=0.17), but a higher gain (2.06 cm) was observed in the MOC group. The within-subjects test indicated that the time effect was significant (p=0.001) on HGG and linearly influenced (p=0.023) by time. The dietary effects of three calf starters on BLG were found unchanged but significantly differed from the control diet (p≤0.01). Time and the interaction of time and group had no significant effects on BLG (Table 3). We found a significant difference (p=0.05) in WHG among the diets with different protein sources but calves that consumed MOCSM protein source had the highest WHG (1.82 cm).
Effects of diets on blood metabolites
Table 2 shows the effects of calf starters on blood metabolites in calves during the pre-weaning period. The calves fed the control, MOC, SM, and MOCSM diets had no influence on blood glucose concentrations (p=0.63). As depicted in Table 2, serum albumin level was noticeably (p=0.01) higher in the MOC group than in the control group and was statistically similar to SM and MOCSM groups. The within-subjects effects on albumin exposed that time had a significant (p<0.01) impact on albumin concentration in calves (Table 3) and time influenced albumin concentration in both linear (p=0.001) and quadratic (p=0.01) patterns. However, serum albumin level was not influenced (p>0.05) by the interaction effects of time and diets (Table 4).
Overall, serum urea and BUN concentrations were significantly (p<0.01) lower in the control group (15.42 and 7.21 mg/dL) than that of MOC (20.35 and 9.51 mg/dL), SM (18.87 and 8.82 mg/dL), and MOCSM (18.58 and 8.68 mg/dL) fed calves. The concentrations of serum urea and BUN increased in calves’ blood both linearly (p=0.001) and quadratic (p<0.01) manners with the advancement over time (Tables 3 and 4). The time and diet interaction effect (p=0.02) significantly impacted urea and BUN concentrations (Table 3). Blood serum calcium concentrations of dietary groups (MOC, SM, and MOCSM) varied significantly (p=0.02) from 2.18-2.84 mg/dL from the control group. In the case of phosphorus, treatment groups, MOC, SM, and MOCSM dietary groups variation was 0.67-0.81 mg/dL from the control group (Table 2). The within-subjects test revealed that time has a statistically significant (p<0.01) effect on the calves' serum calcium levels. Likewise, the effect of time and diet interaction on calcium levels was linearly significant (p<0.01, Tables 3 and 4). The time and time X diet interaction influenced blood serum phosphorus concentration. In addition, the within-subjects contrast test showed a linear (p=0.004) interaction effect of dietary groups over time on calf phosphorus values (Table 4).