The aim of this study was to compare performance and carcass characteristics of broilers fed diets with different Dietary Electrolyte balances (DEB) during the summer season. A total of 1,280 one-day-old Ross sexed chicks were distributed in 32 experimental units according to a randomized block design in a 4x2 factorial arrangement (4 levels and 2 sexes) and 4 replicates per treatment (40 birds per replicate). Feed program consisted of 3 phases (1-21, 22-42, 43-49 days of age). Experimental diets were formulated based on corn and soybean meal and adjusted to 210, 250, 290 and 330 mEq/kg of Na + K -Cl through the addition of sodium carbonate, potassium carbonate and ammonium chloride. Weekly measurements of body weight gain and feed intake were done, and at 49 days, birds were slaughtered to evaluate the dressing percentage and parts yield. Weight gain during the starter phase increased linearly (p<0.01) as DEB increased. Different DEB levels did not affect feed intake or mortality. Carcass characteristics were not affected by treatments. Dietary electrolytic balance influenced weight gain and feed gain ratio from 1 to 21 days, and best results were observed when diets contained 290 and 330 mEq/kg.
Effects of maize processing on diet selection was studied in 12 fi stulated dry cows. Subexperimental period was repeated twice (8 animals/treatment) and lasted 20 days. Treatments allowed selection between roughage and processed maize: (CG) coarsely-ground, (FG) fi nely-ground and (SF) steam-fl aked. Urea was used with sugar cane (10% of crude protein) to avoid N infl uence over selection. Intake of maize in SF was 45.1 and 42.1% lower than in CG and FG, decreasing total DM and TDN intake, and increasing NDF intake. However, degradable starch intake did not differ. Animals were able to recognize differences among maize physical characteristics.
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