| Autor: |
O'Quinn, P. R., Nelssen, J. L., Goodband, R. D., Unruh, J. A., Woodworth, J. C., Smith, J. S., Tokach, M. D. |
| Zdroj: |
Journal of Animal Science; September 2000, Vol. 78 Issue: 9 p2359-2368, 10p |
| Abstrakt: |
Two experiments were conducted to evaluate the effects of conjugated linoleic acid (CLA)-enriched feed additives for swine. These additives included a source of CLA that was commercially available (CLA-60) and modified tall oil (MTO). Experiment 1 used 36 barrows (initially 37.6±2.8 kg) to compare the effects of CLA-60 and MTO on growth performance and carcass characteristics of finishing pigs. The corn-soybean meal diets contained .50% soybean oil (control), .50% CLA-60, or .50% MTO. Pigs fed CLA-60 had less (P= .03) ADG from 37.6 to 72.6 kg than the control pigs; otherwise, pigs fed either CLA-60 or MTO had growth performance similar (P> .15) to that of the control pigs. Pigs fed MTO grew faster (P= .03) and consumed more feed (P= .10) over the duration of the experiment (37.6 to 106.4 kg) than pigs fed CLA-60. Dietary treatment did not affect (P> .15) plasma triglycerides or carcass characteristics, but pigs fed either MTO or CLA-60 had greater saturation of fatty acids in the adipose tissue at the 10th rib than pigs fed the control diet. Experiment 2 used 80 barrows (initially 33.4±2.2 kg) to examine the effects of increasing levels of MTO on growth performance and carcass characteristics of finishing pigs. The corn-soybean meal diet contained 1% cornstarch, which was replaced with MTO to give dietary levels of .25, .50, or 1.00% MTO. Dietary treatment did not affect (P> .15) growth performance. Feeding increasing levels of MTO quadratically decreased (P= .02) average backfat thickness and longissimus muscle drip loss (P= .04) and quadratically increased longissimus muscle area (P= .07) and percentage lean (P= .03). Feeding MTO tended to increase belly firmness (P< .10) compared with pigs fed the control diet. These traits appeared to be optimized with .50% MTO. In summary, pigs fed MTO had greater ADG, ADFI, and ending BW than pigs fed CLA-60. Feeding MTO does not appear to affect growth performance but improves carcass lean content and may additionally improve some aspects of meat quality in growing-finishing pigs. |
| Databáze: |
Supplemental Index |
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