757
The effects of standardized ileal digestible lysine level with or without tribasic copper chloride on growth performance, carcass characteristics, and fat quality in finishing pigs
A total of 1,248 pigs (initially 28.9 kg BW) were used in a 120-d study to determine the effects of added tribasic copper chloride (TBCC; IntelliBond C; Micronutrients, Indianapolis, IN) and increasing standardized ileal digestible Lys on growth performance, carcass characteristics, liver Cu concentration, and carcass fat quality in finishing pigs. Pens of pigs were allotted to 1 of 6 dietary treatments, balanced on average pen weight in a randomized complete block design with 26 pigs per pen and 8 replications per treatment. Treatments were arranged in a 3×2 factorial with main effects of SID Lys (85, 92.5, and 100% of the estimated requirement) and added Cu (0 or 150 ppm) from TBCC. All diets were corn-soybean meal-based with 30% distiller’s dried grains with solubles, 15% bakery meal and 17 ppm Cu from CuSO4 provided from the trace mineral premix. There were no TBCC × SID Lys interactions observed for growth performance or liver Cu concentrations. Increasing SID Lys increased (P< 0.01) ADG, G:F and final BW (Table 1). Pigs fed 150 ppm TBCC tended (P<0.10) to have increased ADG, G:F and final BW. Liver Cu concentrations were greater (P<0.01) in pigs fed TBCC and tended to decrease (quadratic; P<0.09) as SID Lys increased. In pigs fed TBCC, jowl fat iodine value (IV) calculated from the fatty acid analysis of all 3 fat layers, increased with increasing SID Lys but not in pigs fed diets without TBCC (Lys × TBCC interaction; P<0.03). In summary, SID Lys did not influence the response to TBCC is this experiment.
Table 1. Dietary SID lys level with or without tribasic copper chloride in finishing pigs. |
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|
TBCC, ppm |
Probability, P <1 |
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|
0 |
150 |
|
SID Lys |
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SID Lys, % |
85.0 |
92.5 |
100.0 |
85.0 |
92.5 |
100.0 |
TBCC |
Linear |
Quadratic |
d 120 BW, kg |
122.8 |
125.4 |
126.2 |
123.7 |
125.8 |
129.0 |
0.07 |
0.01 |
0.76 |
|
|
|
|
|
|
|
|
|
|
ADG, kg |
0.80 |
0.81 |
0.82 |
0.80 |
0.82 |
0.84 |
0.10 |
0.01 |
0.74 |
ADFI, kg |
2.18 |
2.20 |
2.19 |
2.19 |
2.19 |
2.23 |
0.65 |
0.23 |
0.95 |
G:F |
0.365 |
0.370 |
0.373 |
0.365 |
0.374 |
0.380 |
0.09 |
0.01 |
0.58 |
|
|
|
|
|
|
|
|
|
|
Liver Cu, ppm |
13 |
13 |
12 |
33 |
33 |
26 |
0.01 |
0.18 |
0.09 |
Jowl IV2 |
84.2 |
84.6 |
83.6 |
82.7 |
83.6 |
85.5 |
0.74 |
0.16 |
0.87 |
1SEM were 1.52, 0.007, 0.032, 0.004, 3.3, and 0.801 for d 120 BW, ADG, ADFI, G:F, liver Cu, and jowl IV respectively.
2Linear TBCC × Lys interaction (P<0.03).
Keywords: finishing pig, copper, lysine, iodine value