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Made available in DSpace on 2021-06-25T19:36:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-10-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) The objective of this study was to investigate the effects of partial and total replacement of corn cracked grain with soybean molasses (SM) on performance and meat quality of feedlot finished lambs. Thirty crossbred lambs (Santa Ines x Dorper, three months old) were blocked by initial body weight (16.8 +/- 2.2 kg), and randomly assigned to three experimental treatments. During a 70-d experimental period, the animals were fed total mixed rations containing corn silage as forage source in a 40:60 (wt/wt) forage to concentrate ratio (dry matter basis). Dietary treatments consisted of different inclusion levels of soybean molasses: 0 g/kg DM (CON), 150 g/kg DM (SM15), or 300 g/kg DM (SM30). Lambs were slaughtered for evaluation of carcass characteristics and meat quality in Longissimus thoracis muscle. The inclusion of SM did not affect neither the feedlot performance nor the carcass quality, except for the gain to feed ratio, which decreased linearly (P = 0.05). The Longissimus muscle tenderness and intramuscular fat were linearly increased (P = 0.03, P < 0.01, respectively), with increasing SM in the diet. Linear trends for pentadecanoic, heptadecenoic, gamma linolenic and EPA acids (P = 0.07; P = 0.07; P = 0.07 and P = 0.09, respectively) were observed. Linear decrease was also observed for linoleic acid (P = 0.01). The addition of soybean molasses increased meat tenderness and intramuscular fat in crossbred feedlot finished lambs, when fed up to 300 g/kg DM, being a potential alternative to replace corn in feedlot diets, depending on its cost and availability. Sao Paulo State Univ, Dept Anim Sci, Sch Agr & Veterinarian Sci, BR-14884900 Sao Paulo, Brazil Univ Fed Triangulo Mineiro, Dept Agron, BR-38280000 Iturama, MG, Brazil Sao Paulo State Univ, Dept Anim Sci, Sch Agr & Veterinarian Sci, BR-14884900 Sao Paulo, Brazil CAPES: 001

Made available in DSpace on 2019-10-06T16:57:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01 Previous studies have shown that beef cattle can be adapted for 14 days to high-energy diets; however, the effects of adaptation periods less than 14 days on feedlot performance have not been documented in the literature. In the present study, the effects of restricted intake of the final finishing diet as a means of dietary adaptation compared with diets increasing in concentrate content (step-up) over periods of 9 days and 14 days on feedlot performance, feeding behavior, blood gas profile rumen morphometrics, nutrients digestibility and carcass characteristics of Nellore cattle were evaluated. One-hundred twenty 24 month-old Nellore bulls (361 ± 30 kg) were randomly allocated in 24 pens and fed for 84 days in a completely randomized block design with a 2 × 2 factorial arrangement of treatments: adaptation using both 9-day and 14-day step-up protocol, and 9-day and 14-day restriction protocol. Each treatment was replicated 6 times. One bull per pen was slaughtered at the end of adaptation period for ruminal evaluations. Overall, no main effect of protocols or adaptation length was observed for any of feedlot performance or carcass traits variables evaluated, with the exception of gain to feed ratio (G:F). Bulls on restriction protocol had improved G:F (P = 0.04) when compared to cattle adapted by step-up protocol. Regarding rumenitis score, there was no main effect of protocols and adaptation length (P > 0.05). For rumen morphometrics, an interaction between the effect of adaptation length and period was observed (P = 0.02) for absorptive surface area (ASA), where at the end of the adaptation period, Nellore bulls adapted for 14 days presented larger ASA than the ones adapted for 9 days; however, at the end of the finishing period, ASA from animals adapted for 14 days was similar to the ones adapted for 9 days. Thus, Nellore yearling bulls should be adapted in 14 days regardless of the protocol adopted (step-up or restriction). São Paulo State University (UNESP) School of Veterinary Medicine and Animal Science São Paulo State University (UNESP) College of Agricultural and Technological Sciences São Paulo State University (UNESP) School of Veterinary Medicine and Animal Science São Paulo State University (UNESP) College of Agricultural and Technological Sciences

The objective of this study was to evaluate the quality traits of meat from feedlot fed increasing concentrations of soybean molasses (SM). Twenty-seven crossbred (Santa Ines × Dorper) lambs (average 16 5,33 kg BW) were distributed in a randomized completed block design, according to initial BW, and assigned to three treatments, with increasing inclusions of SM (M0 = control treatment, without SM; M15 = 15% SM and M30 = 30% SM on DM basis. Diets were composed of corn silage (40%) and concentrate (60%), corn cracked grain [except for M30], wheat meal, soybean meal, urea, soybean molasses [except M0], and mineral-vitamin premix. The SM contained 41.5 g/kg CP; 25 g/kg fat and 207.42 g/L of sugars. After 72 d, when the animals reached approximately 32 kg BW, the lambs were slaughtered at a commercial abattoir, and the carcasses were chilled (4ºC) for 24 hours. The Longissimus muscle were cut between the 11(th) and 13(th) ribs, and used to evaluate muscle color, cooking loss (CL), water holding capacity (WHC), and Warner Bratzler shear force (WBSF). Data were analyzed using the MIXED procedure of SAS, evaluating the linear and quadratic effects of SM addition, as well as M0 × (M15 + M30). The soybean molasses did not affect most of the evaluated variables as muscle color, WHC and CL (P > 0.05), excepted for WBSF, which the SM promoted a linear effect, (36.0 [M0] to 25.7 N [M30] (P < 0.0001). The results indicate SM as potential alternative energy ingredient for feedlot lamb, and that the higher inclusion better texture meat. [Image: see text]

Made available in DSpace on 2018-12-11T17:32:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-06-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Crude glycerin, the main by-product of biodiesel production, can replace dietary energy sources, such as corn. The objective of this study was to evaluate the inclusion of up to 30% of crude glycerin in dry matter (DM) of the total diets, and its effects on meat quality parameters of feedlot Nellore bulls. Thirty animals (227.7 ± 23.8 kg body weight; 18 months old) were housed in individual pens and fed 5 experimental diets, containing 0, 7.5, 15, 22.5 or 30% crude glycerin (DM basis). After 103 d (21 d adaptation) animals were slaughtered and the Longissimus muscle was collected. The characteristics assessed were chemical composition, fatty acid profile, cholesterol, shear force, pH, color, water-holding capacity, cooking loss and sensory properties. The increasing inclusion of crude glycerin in the diets did not affect the chemical composition of the Longissimus muscle (P > 0.10). A quadratic effect was observed when levels of crude glycerin were increased, on the concentration of pentadecanoic, palmitoleic and eicosenoic fatty acids in meat (P < 0.05), and on the activity of the delta-9 desaturase 16 and delta-9 desaturase 18 enzymes (P < 0.05). The addition of crude glycerin increased the gamma linolenic fatty acid concentration (P < 0.01), and altered the monounsaturated fatty acids in Longissimus muscle of animals (Pquad. < 0.05). Crude glycerin decreased cholesterol content in meat (P < 0.05), and promoted higher flavor score and greasy intensity perception of the meat (P < 0.01). The inclusion of up to 30% crude glycerin in Nellore cattle bulls'diets (DM basis) improves meat cholesterol and sensory attributes, such as flavor, without affecting significantly the physical traits, the main fatty acid concentrations and the chemical composition. São Paulo State University (Unesp) School of Agrarian and Veterinarian Sciences São Paulo State University (Unesp) School of Veterinary Medicine and Animal Science Federal University of Triângulo Mineiro São Paulo State University (Unesp) School of Agrarian and Veterinarian Sciences São Paulo State University (Unesp) School of Veterinary Medicine and Animal Science FAPESP: 08/53712-0 FAPESP: 09/51857-3