Table 1.
Diet composition (as-fed basis)1
| Item | Control | Cu | CTC | Cu + CTC |
|---|---|---|---|---|
| Ingredients, % | ||||
| Corn | 56.05 | 55.97 | 55.62 | 55.54 |
| Soybean meal, 47% crude protein | 24.76 | 24.77 | 24.79 | 24.80 |
| Dried whey | 10.00 | 10.00 | 10.00 | 10.00 |
| Enzyme-treated soybean meal2 | 5.00 | 5.00 | 5.00 | 5.00 |
| Monocalcium phosphate, 21.5% phosphorus | 1.20 | 1.20 | 1.20 | 1.20 |
| Calcium carbonate | 1.05 | 1.05 | 1.05 | 1.05 |
| Sodium chloride | 0.60 | 0.60 | 0.60 | 0.60 |
| L-Lysine HCl | 0.45 | 0.45 | 0.45 | 0.45 |
| DL-Methionine | 0.20 | 0.20 | 0.20 | 0.20 |
| L-Threonine | 0.20 | 0.20 | 0.20 | 0.20 |
| L-Tryptophan | 0.02 | 0.02 | 0.02 | 0.02 |
| L-Valine | 0.05 | 0.05 | 0.05 | 0.05 |
| Trace mineral premix3 | 0.15 | 0.15 | 0.15 | 0.15 |
| Vitamin premix4 | 0.25 | 0.25 | 0.25 | 0.25 |
| Phytase5 | 0.02 | 0.02 | 0.02 | 0.02 |
| Copper sulfate6 | — | 0.08 | — | 0.08 |
| Chlortetracycline7 | — | — | 0.40 | 0.40 |
| Total | 100 | 100 | 100 | 100 |
| Calculated analysis | ||||
| SID8 amino acids, % | ||||
| Lysine | 1.35 | 1.35 | 1.35 | 1.35 |
| Isoleucine:lysine | 57 | 57 | 57 | 57 |
| Leucine:lysine | 115 | 115 | 115 | 115 |
| Methionine:lysine | 36 | 36 | 35 | 35 |
| Methionine and cysteine:lysine | 57 | 57 | 57 | 57 |
| Threonine:lysine | 64 | 64 | 64 | 64 |
| Tryptophan:lysine | 18.5 | 18.5 | 18.5 | 18.5 |
| Valine:lysine | 65 | 65 | 65 | 65 |
| NE, kcal/kg | 2436 | 2434 | 2425 | 2423 |
| Crude protein, % | 21.1 | 21.1 | 21.1 | 21.1 |
| Total calcium, % | 0.79 | 0.79 | 0.79 | 0.79 |
| STTD9 phosphorus, % | 0.53 | 0.53 | 0.53 | 0.53 |
| Analyzed composition | ||||
| Dry matter, % | 88.2 | 88.1 | 88.1 | 88.2 |
| Crude protein, % | 20.6 | 20.7 | 20.9 | 21.1 |
| Calcium, % | 0.85 | 0.91 | 0.93 | 0.91 |
| Phosphorus, % | 0.63 | 0.65 | 0.69 | 0.66 |
| Copper, mg/kg | 24 | 202 | 31 | 194 |
| Chlortetracycline, mg/kg | ND10 | 0.06 | 539 | 309 |
1Diets were fed in meal form from 7.4 to 19.7 kg BW. Copper (Cu) sulfate and chlortetracycline (CTC) were included in the diet at the expense of corn.
2HP 300 (Hamlet Protein, Inc., Findlay, OH).
3Provided per kg of premix: 73 g Zn from Zn sulfate; 73 g Fe from iron sulfate; 22 g Mn from manganese oxide; 11 g Cu from copper sulfate; 0.2 g I from calcium iodate; 0.2 g Se from sodium selenite.
4Provided per kg of premix: 3,527,399 IU vitamin A; 881,850 IU vitamin D; 17,637 IU vitamin E; 1,764 mg vitamin K; 15.4 mg vitamin B12; 33,069 mg niacin; 11,023 mg pantothenic acid; 3,307 mg riboflavin.
5Ronozyme Hiphos 2700 (DSM Nutritional Products, Inc., Basel, Switzerland) provided 476 phytase units per kg of feed.
6Copper sulfate provided 200 mg/kg of Cu.
7Aureomycin 50 (Zoetis Services, LLC., Parsippany, NJ) provided 440 mg/kg CTC.
8SID, standardized ileal digestible.
9STTD, standardized total tract digestible.
10ND, not detected above the detection limit of 0.05 mg/kg.