Características de carcaça e da carne de novilhos Hereford terminados em confinamento com diferentes fontes de volumoso

Abstract

diferença entre tratamentos para rendimento de carcaça fria, quebra durante o resfriamento e porcentagem dos cortes comerciais da carcaça. O comprimento de carcaça foi maior nos novilhos alimentados com silagem de milho (125 vs 122 cm), mas a fonte de volumoso não afetou a conformação de carcaça, espessura de gordura de cobertura, área de Longissimus dorsi, assim como as porcentagens de músculo e osso na carcaça, sendo que, na média dos dois tratamentos, essas características apresentaram valores de 9,5 pontos, 5,04 mm, 58,1 cm 2 , 63,7 e 15,4%. Novilhos alimentados com silagem de milho apresentaram maior porcentagem de gordura na carcaça (23,2 vs 20,6%). Não houve diferença significativa nas características cor, textura, marmoreio, força de cizalhamento, maciez e quebra na cocção da carne, mas a quebra ao descongelamento foi maior nos animais alimentados com cana-de-açúcar (6,10 vs 3,69%).Palavras-chave: cana-de-açúcar, qualidade da forragem, qualidade da carne, rendimento de carcaça, silagem de milho Carcass and Meat Characteristics of Hereford Steers Finished in Feedlot with DifferentRoughage Sources ABSTRACT -The objective of this work was to study the carcass and meat characteristics of Hereford steers, finished in feedlot for 112 days and fed with 33% concentrate and 67% chopped sugar cane or corn silage diets, containing 12% of crude protein. Twelve steers, with 20 months of age, were used. Slaughter weight, hot carcass weight and cold carcass weight were higher for steers fed corn silage, being, respectively, 446, 230 and 227 kg vs 421, 211 and 208 kg, in the same order, for animals fed chopped sugar cane. No significant differences among treatments were observed for cold dressing percentage, chilling loss and commercial cuts percentage. Carcass length was higher for steers fed corn silage (125 vs 122 cm), but the roughage source did not affect the carcass conformation, fat thickness, longissimus dorsi area, as well as carcass muscle and bone percentages, being the averages of the two treatments, for these this characteristics, respectively, 9.5 points, 5.04 mm, 58.1 cm 2 , 63.7 and 15.4%. Steers fed corn silage showed higher fat percentage (23.2 vs 20.6%). No significant difference were observed for meat color, texture, marbling, Shear value, tenderness and cooking loss, but the thawing loss was higher for steers fed chopped sugar cane (6.10 vs 3.69%).

Meat yield of culled cow and steer carcasses

“…In the present study, total average bone yield was 17.65% (Table 8), not taking into consideration rib bones, as the rib cuts were prepared with bone in. Summing the 1.96% rib bone yield obtained by (Osório et al, 1995;Junqueira et al, 1998;Ledic et al, 2000;Coutinho Filho et al, 2006;Bonilha et al, 2007;Tarouco et al, 2007) found lower percentages of edible cuts, and higher percentages of bone than those that reported the method proposed by Hankins & Howe (1946) (Perotto et al, 2000;Feijó et al, 2001;Vaz & Restle, 2005;Kuss et al, 2005;Canesin et al, 2006). The studies using the direct assessment method for deboning obtained 19.08% average bone yield, whereas those applying the HH method achieved 16.85%, resulting in a 3.23% difference.…”

“…Vaz & Restle (2005) Means followed by different letters in the same trait are different by the Tukey test (P<0.05). 1 1 to 18 score scale: 4 a 6 = poor; 7 a 9 = regular; 10 a 12 = good.…”

Características da carcaça e da carne de bovinos sob diferentes dietas, em confinamento

“…Vaz e Restle (2005) avaliaram a cana-de-açúcar e a silagem de milho na alimentação de novilhos Hereford em confinamento, e não observaram diferenças nas características qualitativas da carne, porém os animais alimentados com silagem de milho apresentaram carcaças mais pesadas. Brondani et al (2006) observaram maior rendimento de carcaça para animais alimentados com silagem de milho em relação aos alimentados com cana-de-açúcar, não sendo detectadas diferenças quanto à qualidade da carne.…”

Carcass boneless yield of Braford steers, classified according to fat coverage class

“…In crossbred Charolais × Nelore steers, Vaz & Restle (2005) found that subcutaneous fat thickness is directly related to flank yield (r = 0.66), but it is not significantly correlated with carcass weight (r =-0.01) or dressing percentage (r = -0.27).…”

“…Fat thickness is influenced by several factors, such as season, crossbreeding, animal class, weight, and nutritional background. Market factors related to prices and off seasons in the offer of cattle also make farmers keep their animals for longer, increasing carcass finishing (Vaz & Restle, 2005).…”