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Rios-Rincon, F.G.,Estrada-Angulo, A.,Plascencia, A.,Lopez-Soto, M.A.,Castro-Perez, B.I.,Portillo-Loera, J.J.,Robles-Estrada, J.C.,Calderon-Cortes, J.F.,Davila-Ramos, H. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.1
Forty-eight Pelibuey${\times}$Katahdin male intact lambs ($23.87{\pm}2.84$ kg) were used in an 84-d feeding trial, with six pens per treatment in a $2{\times}2$ factorial design arrangement. The aim of the study was to evaluate the interaction of two dietary energy levels (3.05 and 2.83 Mcal/kg ME) and two dietary protein levels (17.5% and 14.5%) on growth performance, dietary energetics and carcass traits. The dietary treatments used were: i) High protein-high energy (HP-HE); ii) High protein-low energy (HP-LE); iii) Low protein-high energy (LP-HE), and iv) Low protein-low energy (LP-LE). With a high-energy level, dry matter intake (DMI) values were 6.1% lower in the low-protein diets, while with low-energy, the DMI values did not differ between the dietary protein levels. Energy levels did not influence the final weight and average daily gain (ADG), but resulted in lower DMI values and higher gain efficiencies. No effects of protein level were detected on growth performance. The observed dietary net energy (NE) ratio and observed DMI were closer than expected in all treatments and were not affected by the different treatments. There was an interaction (p<0.03) between energy and protein level for kidney-pelvic and heart fat (KPH), KPH was higher in lambs fed high energy and high protein diet but not in high energy and low protein diet. The KPH was increased (20.2%, p = 0.01) in high-energy diets, while fat thickness was increased (21.7%, p = 0.02) in high-protein diets. Therefore, it is concluded that dietary energy levels play a more important role in feed efficiency than protein levels in finishing lambs with a high-energy diet (>2.80 Mcal/kg ME). Providing a level of protein above 14.5% does not improves growth-performance, dietary energetics or carcass dressing percentage.
Wheat Bran Globulins: Competitive Inhibitors of Mushroom Tyrosinase
Angel Martín Ortíz-Estrada,Jorge Nemesio Mercado-Ruiz,Alma Rosa Islas-Rubio,Ana María Mendoza-Wilson,René Renato Balandrán-Quintana,Jesús Manuel García-Robles 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.3
The inhibitory capacity of the globulin fraction of wheat bran against the diphenolase activity of mushroom tyrosinase, using L-tyrosine as substrate, was evaluated. Enzyme kinetics was monitored in the presence of globulin solutions by measuring the absorbance at 475nm. Lineweaver-Burk plots were drawn in order to determine Vmax, Km, and type of inhibition. Results showed that globulins from wheat bran competitively inhibited, the activity of mushroom tyrosinase with a KI of 0.79%(w/v). The degree of inhibition was 24% at 2 mM of the substrate L-tyrosine.