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Effects of Endo-1,4-β-D-mannanase on growth performance and carcass characteristics of finishing pigs fed ractopamine HCl and marketed in a 3-cut strategy
A total of 1,138 pigs (TR4 x Fast x L02; initially 111.7 kg ± 0.4152 kg’s) were used in a 35-d study to determine the effects of endo-1, 4-β-D-mannanase (Hemicell® HT 1.5X, Elanco Animal Health, Greenfield, IN) on growth performance and carcass characteristics of finishing pigs fed ractopamine HCl (Paylean®, Elanco Animal Health, Greenfield, IN) and marketed in a 3-cut strategy. Pens of pigs were allotted to 1 of 2 dietary treatments with 18-19 pigs per pen and 30 replications per treatment. The two treatment diets utilized were a corn-soybean meal-based control diet containing 7.4 ppm of ractopamine HCl and the control diet with the addition of endo-1,4-β-D-mannanase (0.08 MU/kg). Pigs were marketed out of each pen on d 7, 21, and 35 with approximately 20, 30, and 50% of the beginning inventory removed at each marketing event, respectively. From d 0 to 7, there were no differences in growth performance between treatments. However, from d 7 to 21 and d 21 to 35, pigs fed the diet containing endo-1,4-β-D-mannanase had increased (P < 0.05) ADG and tended to have improved (P < 0.10) G:F compared to those fed the diet without. Overall, from d 0 to 35, pigs fed the diet containing endo-1, 4-β-D-mannanase tended (P < 0.10) to have increased ADG and improved G:F. Carcass data for pigs marketed on d 7 was not available for analysis. However, when carcass data for pigs slaughtered on d 21 and 35 was combined, pigs fed endo-1, 4-β-D-mannanase had increased (P< 0.05) carcass ADG and carcass yield. In conclusion, the addition of endo-1, 4-β-D-mannanase to finishing pig diets containing ractopamine may be useful in improving growth performance and carcass characteristics.
Item |
Control |
Control + 0.03% Hemicell |
SEM |
Probability, P < |
BW, kg |
|
|
|
|
d 0 |
112.1 |
111.2 |
0.43 |
0.132 |
Average at market |
140.1 |
139.8 |
0.37 |
0.492 |
|
|
|
|
|
ADG, kg |
1.06 |
1.09 |
0.014 |
0.066 |
G:F |
0.351 |
0.357 |
0.010 |
0.071 |
|
|
|
|
|
Carcass ADG, kg |
0.964 |
0.990 |
0.042 |
0.012 |
Carcass yield, % |
76.67 |
77.12 |
0.093 |
0.001 |
Keywords: finishing pig, ractopamine HCl, endo-1,4-β-D-mannanase