| Autor: |
Reeves Pitts MA; Department of Animal Sciences, Auburn University, Auburn, AL 36849, USA., Smith HR; Department of Animal Sciences, Auburn University, Auburn, AL 36849, USA., Amerson EC; Department of Animal Sciences, Auburn University, Auburn, AL 36849, USA., Starkey JD; Department of Poultry Science, Auburn University, Auburn, AL 36849, USA., Starkey CW; Department of Poultry Science, Auburn University, Auburn, AL 36849, USA., Sawyer JT; Department of Animal Sciences, Auburn University, Auburn, AL 36849, USA., Brandebourg TD; Department of Animal Sciences, Auburn University, Auburn, AL 36849, USA. |
| Abstrakt: |
Mangalica pigs are gaining popularity within the U.S. as a niche breed, given their reputation for superior-quality pork. However, slow growth rates, a poor lean yield, and excessive adiposity limit the widespread adoption of Mangalica. To determine if feeding the metabolic modifier, ractopamine hydrochloride (RAC), would improve growth performance without impairing pork quality in the Mangalica, pigs were fed either 0 or 20 mg per kg RAC for 21 days. At 24 h postharvest, pork quality and carcass composition measurements were recorded; then, primal cuts were fabricated and assessed. RAC increased ADG ( p < 0.04) and gain efficiency ( p < 0.03) by 24% and 21%, respectively. RAC increased Loin Eye Area ( p < 0.0001) by 21% but did not impact the 10th rib fat depth ( p > 0.90) or marbling score ( p > 0.77). RAC failed to alter any primal cut weights. Feeding RAC lowered b* values ( p < 0.04) and tended to lower L* values ( p < 0.08) while not affecting a* values ( p > 0.30), suggesting RAC darkened loin color. Finally, RAC decreased cook yield percentage ( p < 0.02) by 11% without impacting Warner-Bratzler Shear Force ( p > 0.31). These data support the hypothesis that feeding RAC to Mangalica improves growth performance without impairing pork quality in this breed. |
