View Full Table | Close Full ViewTable 1.

Effect of timing of growth implant administration on performance of newly received beef calves

 
Treatment1
SEM P-value
Item Control IMP0 IMP14 IMP28
BW, kg
    Initial2 200.9 203.6 203.2 204.5 2.7 0.79
    Day 14 218.2 223.6 218.2 222.3 3.1 0.52
    Day 28 232.3 239.1 230.9 236.4 3.2 0.25
    Day 423 246.4 253.2 248.6 249.5 4.9 0.61
    Day 634 255.5 263.6 261.4 263.6 3.9 0.36
    Day 915 285.9a 304.5b 300.0b 301.8b 4.1 0.10
    Final BW6 313.2a 333.2b 329.5b 335b 4.2 <0.01
ADG, kg/d
    D 0 to 14 1.24 1.41 1.09 1.24 0.12 0.16
    D 14 to 28 1.00 1.12 0.92 1.04 0.12 0.27
    D 28 to 42 1.01 0.99 1.26 0.93 0.30 0.34
    Receiving ADG7 1.08 1.17 1.09 1.07 0.10 0.28
    D 42 to 63 0.43a 0.53ab 0.60b 0.64b 0.18 0.01
    D 63 to 91 1.09a 1.43b 1.38b 1.40b 0.33 <0.01
    D 91 to 120 0.96a 1.01a 1.05a 1.18b 0.09 <0.01
    Pasture ADG8 0.85a 1.02b 1.04bc 1.10c 0.05 <0.01
    Overall ADG9 0.93a 1.08b 1.05b 1.09b 0.02 <0.01
a–cLeast squares means within a row with differing superscripts differ (P < 0.05).
1Control = no growth implant administered; IMP0 = growth implant administered on d 0; IMP14 = growth implant administered on d 14; IMP28 = growth implant administered on d 28.
2Average BW of steers on d –1 and 0 of receiving period.
3Body weight of steers at the end of the receiving period.
4Body weight of steers on d 21 after receiving.
5Body weight of steers on d 49 after receiving.
6Average BW of steers on d 119 and 120.
7Average daily gain of steers from d 0 to 42.
8Average daily gain of steers from d 42 to 120.
9Average daily gain of steers from d 0 to 120.



View Full Table | Close Full ViewTable 2.

Effect of timing of growth implant administration on health of newly received beef calves

 
Treatment1
SEM P-value
Item Control IMP0 IMP14 IMP28
Bovine respiratory disease treatment, %
    Treated once 89.7 96.0 93.8 98.4 8.7 0.52
    Treated twice 24.1 12.4 25.8 27.8 12.9 0.30
    Treated thrice 1.1 0.5 1.6 2.3 2.8 0.69
Days to first treatment 1.2 1.2 1.6 1.3 0.23 0.66
1Control = no growth implant administered; IMP0 = growth implant administered on d 0; IMP14 = growth implant administered on d 14; IMP28 = growth implant administered on d 28.



View Full Table | Close Full ViewTable 3.

Overall effects of timing of growth implant administration on hematology of newly received beef calves sampled on d 0, 14, 28, and 42

 
Treatment1
SEM P-value
Item Control IMP0 IMP14 IMP28 Treatment Day Treatment × day
Total white blood cells,2 ×103/μL 9.98 10.02 8.88 10.20 0.081 0.61 <0.001 0.09
Neutrophils,2 ×103/μL 1.60 1.82 1.60 1.57 0.098 0.69 0.64 0.95
Neutrophils,2 % 17.1 18.4 20.1 16.5 0.09 0.41 0.03 1.00
Lymphocytes, ×103/μL 6.84 7.28 6.25 7.71 0.72 0.52 <0.001 0.57
Lymphocytes, % 66.2 66.2 64.8 69.0 3.57 0.87 <0.001 0.98
Neutrophil:lymphocyte2 0.35 0.34 0.40 0.30 0.14 0.55 0.01 0.96
Monocytes, ×103/μL 1.07 1.17 1.07 1.09 0.06 0.57 0.01 0.06
Monocytes, % 11.6 12.4 12.7 11.8 1.35 0.93 <0.001 0.20
Eosinophils,2 ×103/μL 0.08 0.09 0.10 0.08 0.26 0.92 <0.001 0.98
Eosinophils,2 % 0.9 0.9 1.3 0.8 0.20 0.34 <0.001 0.86
Red blood cells, ×106/μL 10.2 10.2 10.2 10.0 0.28 0.98 <0.001 0.93
Hemoglobin, g/100 mL 12.6 12.5 12.7 12.4 0.27 0.89 <0.001 0.99
Hematocrit, % 36.3 35.9 36.5 35.7 0.71 0.87 <0.001 0.98
Platelets,2 ×103/μL 689 635 655 679 0.10 0.93 <0.001 0.02
1Control = no growth implant administered; IMP0 = growth implant administered on d 0; IMP14 = growth implant administered on d 14; IMP28 = growth implant administered on d 28.
2Data were log transformed before statistical analysis. Reported least squares means are the geometric means; the SEM is for the log transformed data.



View Full Table | Close Full ViewTable 4.

Main effect of sampling day on hematology of newly received beef calves

 
Day
SEM Contrasts, P-value
Item 0 14 28 42 Linear Quadratic Cubic
Total white blood cells,1 ×103/μL 8.58a 9.19a 11.63b 9.93b 0.06 <0.001 0.005 0.08
Neutrophils,1 ×103/μL 1.85 1.50 1.51 1.74 0.14 0.74 0.22 0.92
Neutrophils,1 % 23.2b 17.5ab 13.7a 18.7ab 0.14 0.10 0.03 0.59
Lymphocytes, ×103/μL 5.26a 6.52a 9.26b 7.03ab 0.71 0.001 <0.001 0.17
Lymphocytes, % 57.9a 65.5ab 78.2b 64.6ab 4.05 0.02 <0.001 0.26
Neutrophil:lymphocyte1 0.51b 0.40ab 0.21a 0.33ab 0.23 0.02 0.10 0.32
Monocytes, ×103/μL 1.09b 0.98a 1.20b 1.13b 0.05 0.12 0.71 0.004
Monocytes, % 13.6b 12.2ab 9.6a 13.3b 1.08 0.26 <0.001 0.24
Eosinophils,1 ×103/μL 0.04a 0.09b 0.14b 0.11b 0.21 <0.001 0.001 0.96
Eosinophils,1 % 0.5a 1.1b 1.3b 1.2b 0.19 <0.001 0.007 0.73
Red blood cells, ×106/μL 10.6b 10.0a 10.0a 10.0a 0.15 <0.001 <0.001 0.16
Hemoglobin, g/100 mL 12.8b 12.2a 12.5b 12.6b 0.16 0.44 0.001 0.007
Hematocrit, % 37.9c 35.0a 35.5ab 36.1b 0.43 0.005 <0.001 0.004
Platelets,1 ×103/μL 529a 969c 675b 563a 0.06 0.46 <0.001 <0.001
a–cLeast squares means within a row with differing superscripts differ (P ≤ 0.05).
1Data were log transformed before statistical analysis. Reported least squares means are the geometric means; the SEM is for the log transformed data.