4.7 Article

Feeding strategies impact animal growth and beef color and tenderness

Journal

MEAT SCIENCE
Volume 183, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.meatsci.2021.108599

Keywords

Grain-fed; Grass-fed; Feeding regime; Meat aging; Muscle growth

Funding

  1. Foundation for Research Support of the State of Sao Paulo (FAPESP) [2018/01434-8, 2018/25320-1]
  2. (National Council for Scientific and Technological Development CNPq) [430664/2018-4]
  3. A1364 Novel Foods and Innovative Manufacturing Technology from the USDA National Institute of Food and Agriculture [2020-67017-31269]

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The study found that the growth rate has a greater impact on muscle and fat deposition in feedlot-finished animals, but a smaller impact on pasture-finished animals. Feedlot animals had higher Longissimus muscle area, backfat thickness, meat luminosity, and tenderness compared to pasture groups.
The impact of growth rate (GR) and finishing regime (FR) on growth and meat quality traits of Angus x Nellore crossbred steers, harvested at a constant body weight (530 +/- 20 kg) or time on feed (140 days), was evaluated. Treatments were: 1) feedlot, high GR; 2) feedlot, low GR; 3) pasture, high GR and 4) pasture, low GR. Live body composition, carcass and meat quality traits were evaluated. High GR had greater impact on muscle and fat deposition in feedlot-finished, but not in pasture-finished animals. Feedlot animals had higher Longissimus muscle area, backfat thickness, meat luminosity and tenderness when compared to pasture groups. Moreover, pastureand feedlot-finished animals with similar GR did not differ in the chromatic attributes of non-aged meat, regardless of endpoint. Thus, GR appeared to be the main factor driving beef chromatic parameters, while FR had a major impact on achromatic attributes and tenderness of meat.

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