Pasture-finished beef is becoming more popular among consumers due to concerns related to fatty acid content and sustainable practices. The effects of finishing crossbred steers on legume-grass pasture comprised of oats, ryegrass, and clover (PAST), legume-grass pasture plus whole corn grain (WCG) supplementation (SUPP), and only with WCG (GRAIN) on fatty acids profile, volatile compounds, sensory, and texture attributes were studied. Pasture diets (PAST and SUPP) led to lower n-6/n-3 ratio (P < 0.001), and highest deposition of C18:2 cis-9 trans-11 (P < 0.001) in the lean. Beef from steers fed GRAIN had the highest values of volatile compounds associated with lipid oxidation. Off-flavor intensity was significantly greater on beef from steers fed GRAIN when compared to PAST. Overall, muscles from steers finished on PAST and SUPP showed similar attributes but differ when compared to GRAIN. The presence of forage is essential to improve fatty acid profile, decrease volatile compounds associated with lipid oxidation, and minimize off-flavor.
In order to evaluate the performance, carcass characteristics and meat quality of culled ewes finished in pasture or exclusivelywith grain, 41 culled Polwarth ewes, were assigned to six treatments: RY (ryegrass pasture), RYGO (ryegrass and whole grain oats), RYGM (ryegrass and whole grain maize), GM (whole grain maize), GO (whole grain oats), GS (whole grain sorghum). The finishing systemof the ewes influenced weight gain,wherein the GM and GS treatments increased daily weight gain. The GO treatment decreased the dressing percentage. Nonetheless, a*, h*, pH, cooking loss and tenderness were similar across dietary treatments. Using principal component analysis, the variables C18:2n6, h*, n6/n3, TBARS, total lipids, L* and b* were assigned as characteristics of meat from the feedlot animals, while the pasture finishing system produced meat with higher CLA and n-3 fatty acids but lower TBARS values indicating lipid stability.
RESUMO -Objetivou-se com este trabalho avaliar o desempenho e as características da carcaça de cordeiros, em três sistemas de alimentação. Foram utilizados 16 cordeiros, distribuídos aleatoriamente com suas mães, 24 horas após o nascimento, em três tratamentos: PNS: pastagem natural suplementada; PC: pastagem cultivada de azevém (Lolium multiflorum Lam.); e CON: confinamento. O ganho médio diário de 0,404 kg dos cordeiros da PC foi superior aos demais tratamentos, enquanto o ganho de 0,325 kg/dia dos animais da PNS foi superior aos ganhos de 0,213 kg/dia dos animais do CON. O abate ocorreu quando os cordeiros atingiram em torno de 31 kg. O peso da carcaça quente dos animais da PNS (15,7 kg) foi semelhante ao dos animais da PC (16,8 kg) e superior ao confinamento (14,3 kg). Os animais da PNS, PC e CON apresentaram resultados semelhantes para o índice de quebra ao resfriamento com valores de 2,3, 2,1 e 2,5%, respectivamente. Os rendimentos da carcaça quente dos animais de PNS (50,2%) e PC (53,7%) foram semelhantes e superiores aos rendimentos dos animais do CON (45,9%). A compacidade das carcaças não mostrou diferença entre PNS e PC, com valores de 0,287 e 0,307, respectivamente, os quais, porém, foram superiores aos animais do CON (0,253). As carcaças dos animais da PNS e CON não diferiram quanto à espessura de gordura com valores de 1,6 e 1,0 mm, respectivamente. Estes valores foram inferiores aos obtidos na PC (3,3 mm). Ganhos médios diários acima de 0,400 kg/dia e rendimento de carcaça quente acima de 52% podem ser obtidos com cordeiros alimentados com suas mães em pastagem cultivada de azevém, com peso de abate em torno dos 31 kg.Palavras-chave: carcaça quente, compacidade, espessura de gordura, ganho médio diário, sistemas de alimentação Weight Gain and Carcass Characteristics of Lambs Finished in a Natural SupplementedPasture, Ryegrass Pasture (Lolium multiflorum Lam.) and Feedlot ABSTRACT -The objective of this study was to evaluate the performance and carcass characteristics of lambs under three feeding systems. Sixteen lambs, 24 hours after birth, and their mothers were randomly assigned to three treatments: NSP: natural supplemented pasture; RP: ryegrass pasture (Lolium multiflorum lam.) and CON: confinement. Average daily gain of 0.404 kg of RP lambs was higher than the other treatments, whereas NSP animals showed higher gain (0.325 kg/day) than CON animals (0.213 kg/day). The lambs were slaughtered when reached, approximately, 31 kg. The carcass hot weight of NSP animals (15.7 kg) was similar to the RP animals (16.8 kg) and higher than the confinement ones (14.3 kg). NSP, RP and CON animals showed similar results to the cooling index, with values of 2.3 , 2.1 and 2.5%, respectively. Hot carcass yield of NSP (50.2%) and RP (53.7%) animals were similar, however those values were higher than those of CON carcass yield (45.9). Carcass compactness showed no difference between NSP and RP, with values of 0.287 and 0.307, respectively, however, these values were higher than the CON animals (0.253). The carcas...
RESUMO -O trabalho foi realizado objetivando avaliar a composição física da carcaça, as características da carne e a produção dos componentes não carcaça do peso vivo de cordeiros terminados em diferentes sistemas de alimentação. Foram utilizados 16 cordeiros (Texel x Ile de France), distribuídos aleatoriamente com suas respectivas mães, 24 horas após o nascimento, em três tratamentos: PNS -Pastagem natural suplementada, PC -Pastagem cultivada de azevém (Lolium multiflorum Lam.) e CON -Confinamento. Em relação à carcaça fria, não houve diferença para o percentual do pescoço entre PNS, PC e CON com valores de 9,26; 9,20; e 9,30%, respectivamente. Para o percentual de perna, os animais da PNS (33,68%) e CON (33,41%) apresentaram valores semelhantes e superiores aos animais da PC (31,35%). A maciez medida na porção do lombo entre a 9ª e 11ª costelas, por intermédio do aparelho Warner Blatzler-Shear, foi de 8,6 para os animais confinados, sendo este valor superior ao dos animais da PNS e PC com 5,7 e 5,3, respectivamente, os quais foram semelhantes. Não houve efeito dos tratamentos para maciez através do painel, palatabilidade e suculência. O percentual de pele dos animais da PC (11,91) foi mais elevado que o dos animais da PNS e CON, com valores de 10,20 e 9,33% respectivamente. Para o percentual do conteúdo gástrico, os valores dos animais do CON (13,62%) foram superiores aos dos animais da PNS (7,90%), e estes superiores aos dos animais da PC, com 4,75%. O painel como método para determinação da palatabilidade, suculência e maciez não demonstrou diferenças na carne de cordeiros alimentados em pastagem natural suplementada, pastagem cultivada de azevém e confinamento.Palavras-chave: confinamento, conteúdo gástrico, maciez, ovinos, palatabilidade, pastagem cultivada, suculência Carcass Yield, Meat Physical Characteristics and Live Weight Components in Lambs Finished in Three Feeding SystemsABSTRACT -This study was carried outto evaluate the carcass physical composition, meat characteristics and the component conditions, non carcass live weight of lambs finished in different feeding systems. Sixteen lambs (Texel x Ile de France) were used and ramdomly allotted with their mothers, 24 hours after their birth, to three treatments: NSP -Natural supplemented pasture, RP -Ryegrass pasture (Lolium multiflorum lam.) and CON -Confinement. In relation to the cold carcass, there was no difference to the neck percentage among NSP, RP and CON, with values of 9.26, 9.20 and 9.30% respectively. The animals of NSP (33.68%) and CON (33.41%) showed similar and higher values than the RP (31.35%). The softness measured in the loin portion from the 9 th to 11 th ribs, by means of Warner Blatzler-Shear equipment, was of 8.6 for the confined animals, and this value was higher than those of NSP and RP animals (5.7 and 5.3, respectively). There were no treatment effectsfor the softness through the panel, tastiness and succulence. The skin percentage of RP animals (11.91) was higher than the percentage of NSP and CON animals (10.20 and 9.33%...
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