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Arkansas Animal Science Department Report 2001
Table 2. Effects of halothane genotype and magnesium mica on performance of growing-finishing swine.
Halothane genotype a Magnesium mica (%)
Trait NN Nn 0.0 1.25 2.5
Starter phase (38.3 – 74.8 lb)
ADG (lb/d)
ADFI (lb/d)
F/G
1.36 ± 0.037
---
---
1.33 ± 0.031
---
---
1.43 ± 0.042
3.01 ± 0.066
2.11 y ± 0.041
1.32 ± 0.042
2.87 ± 0.066
2.17 y ± 0.041
1.28 ± 0.042
2.93 ± 0.066
2.30 x ± 0.041
Grower phase (74.8 – 150.0 lb)
ADG (lb/d)
ADFI (lb/d)
F/G
2.09 x ± 0.040
---
---
1.97 y ± 0.031
---
---
2.07 ± 0.042
5.13 ± 0.117
2.48 xy ± 0.031
2.02 ± 0.042
4.89 ± 0.117
2.41 y ± 0.031
1.96 ± 0.042
5.01 ± 0.117
2.55 x ± 0.031
Finisher phase (150.0 – 240.0 lb)
ADG (lb/d)
ADFI (lb/d)
F/G
1.98 x ± 0.046
---
---
1.86 y ± 0.037
---
---
1.89 ± 0.047
5.99 ± 0.099
3.18 ± 0.044
1.90 ± 0.047
5.99 ± 0.099
3.16 ± 0.044
1.92 ± 0.047
6.04 ± 0.099
3.15 ± 0.044
Overall (38.3 – 240.0 lb)
ADG (lb/d)
ADFI (lb/d)
F/G
Weights (lb)
Initial
Starter phase
Grower phase
Finisher phase
1.87 x ± 0.029
---
---
38.8 ± 0.37
75.8 ± 1.14
153.5 x ± 2.00
246.3 x ± 3.23
1.77 y ± 0.022
---
---
38.0 ± 0.29
74.0 ± 0.90
147.5 y ± 1.54
234.9 y ± 2.51
1.83 ± 0.026
4.98 ± 0.066
2.71 ± 0.023
38.3 ± 0.02
76.8 ± 1.19
153.8 x ± 1.65
242.7 ± 3.04
1.80 ± 0.026
4.87 ± 0.066
2.70 ± 0.023
38.4 ± 0.02
74.2 ± 1.19
149.6xy ± 1.65
238.6 ± 3.04
1.79 ± 0.026
4.95 ± 0.066
2.77 ± 0.023
38.3 ± 0.02
73.4 ± 1.19
146.6 y ± 1.65
236.8 ± 3.04
a NN = halothane-negative pigs and Nn = halothane-carrier pigs.
x,y Within a row and within a main effect, least-squares (±SE) means lacking a common superscript letter differ (P < 0.05)
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