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Descripción
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| A total of 108 Charolaise cross heifers (214 ± 27.3 kg BW; 6.4 ± 1.1 months of age) were housed in 18 pens of six animals each and used in a 114-day feedlot study. Six pens were randomly assigned to each of the following experimental diets: Control (no supplementation), MAL: control plus 4 g of a disodium/calcium malate mixture per kg of concentrate (2.12 g of malate/kg), and YC: control plus 0.15 g of yeast culture (Saccharomyces cerevisiae CBS 493.94) per kg of concentrate (1.5 x 108 cfu/kg). The control diet consisted on wheat-barley based concentrate (32% starch, DM basis) and barley straw fed ad libitum. On days 0, 56 and 114, ruminal fluid and blood samples were obtained from each heifer 2 h after feeding by ruminocentesis and tail venipuncture, respectively. Body weight, ADFI and G:F ratio were recorded at 28, 56, 84 and 114 days. At slaughter, hot carcass weight and yield and carcass classification were determined in two heifers per pen (12 animals per dietary treatment). Supplementation with malate salts or YC did not affect (P = 0.50 to 0.95) concentrate ADFI, ADG or G:F at any time during the experiment. At slaughter, there were no differences (P = 0.67 to 0.82) in carcass weight, classification and yield among experimental groups. There were no differences (P = 0.15 to 0.96) among experimental groups on ruminal pH, concentrations of VFA, NH3-N and lactate, and plasma concentrations of glucose, urea-N and lactate. In conclusion, under the feeding and management conditions of this study, diet supplementation with malate salts or YC did not have any significant effects on ruminal parameters, blood metabolites, animal performance or carcass quality. | |
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Internacional
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JCR del ISI
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Título de la revista
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Journal of Animal Science |
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ISSN
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0021-8812 |
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Factor de impacto JCR
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2,014 |
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Información de impacto
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Datos JCR del año 2015 |
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Volumen
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94 |
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DOI
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10.2527/jas2016-0616 |
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Número de revista
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10 |
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Desde la página
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