Abstract
This trial aimed to evaluate the inclusion of 10% of crude glycerin associated with roughage sources on the quality of meat aged for 1, 7 or 14 days post mortem of Nellore young bulls. Thirty feedlot animals (n = 10) with initial body weight of 416.70 ± 24.74 kg and 18 months of age were assigned to three treatments: corn silage (CS), sugar cane (SC) and sugar cane bagasse (CB), using a completely randomized design. After 85 days of feeding, animals were slaughtered with 554.51 ± 38.51 kg. Samples of longissimus muscle were collected, after carcass chilling, and vacuum-packed. Diets influenced pH, meat color and subcutaneous fat (SF) (p > 0.05). Animals fed CS showed higher values of b* in SF (p 0.05). Aging times influenced pH and shear force of beef (p < 0.05). Beef aged for 14 days showed higher pH (5.90) and lower shear force (2.40 kgf). Diets containing 10% crude glycerin in the DM associated with CS, SC or CB had no effect on the fatty acid profile in beef. The aging process for 14 days reduces shear force, improving meat quality.
Highlights
The increase in biodiesel production has encouraged the use of crude glycerin in animal feed - an energetic ingredient that can replace corn in up to 20% of the diet DM without affecting the growth of beef feedlot cattle (Barto et al, 2013; Cruz et al, 2014; Eiras et al, 2014a, b; Eiras et al, 2013; Françozo et al, 2013; Parsons et al, 2009). the concentrate feed has the key role in reducing the slaughter age of beef cattle and improve the meat quality, the roughage fraction is aActa Scientiarum
Low production of lactic acid is due to lack of glycogen stores at the time of slaughter, so the higher pH in animals fed sugar cane may be due to some stress of animals before slaughter, as the mixture of lots in the slaughterhouse
Animals fed sugar cane had lower lightness of the meat compared to animals fed corn silage (p < 0.05), which is directly associated with the pH value, since the muscle pH exerts effects on meat lightness, because at pH above 6.0, there is a higher holding of water and less penetration of oxygen, thereby decreasing the lightness of the product
Summary
The increase in biodiesel production has encouraged the use of crude glycerin in animal feed - an energetic ingredient that can replace corn in up to 20% of the diet DM without affecting the growth of beef feedlot cattle (Barto et al, 2013; Cruz et al, 2014; Eiras et al, 2014a, b; Eiras et al, 2013; Françozo et al, 2013; Parsons et al, 2009). 167-172, Apr.-June, 2015 to be studied, since crude glycerin has been reported to affect the fiber digestibility in ruminant diets (Abo El-Nor et al, 2010; Eiras et al, 2014a; Ramos & Kerley, 2012; Silva et al, 2014) and to inhibit lipolysis (Krueger et al, 2010), reducing the accumulation of free fatty acids in the rumen, resulting in greater amount of fatty acids available to be incorporated in meat products (Eiras et al, 2014b; Françozo et al, 2013; Lage et al, 2014). This study was conducted to evaluate the quality of meat aged for 1, 7 or 14 days after the slaughter of young Nellore bulls fed crude glycerin and different sources of roughage during the finishing phase
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