Mejoramiento de la calidad del cascarón con 25 hidroxicolecalciferol 25-(oh)d 3 en dietas de gallinas de primero y segundo ciclos

Abstract

ORDER TO DETERMINE IF THE ADDITION OF 25-HYDROXYCHOLECALCIFEROL [25-(OH)D3] TO LAYER DIETS IMPROVES EGG SHELL QUALITY, TWO EXPERIMENTS WITH BOTH YOUNG AND MOLTED ISA BABCOCK B-300 LAYERS WERE PERFORMED. A COMPLETELY RANDOMIZED DESIGN WITH A 2 €” 2 FACTORIAL ARRANGEMENT WAS USED IN BOTH EXPERIMENTS. TREATMENTS WERE AS FOLLOWS: EXPERIMENT 1 INCLUDED: 1. HIGH CALCIUM LEVEL DIET; 2. LIKE 1 PLUS 69 MG OF PURE 25-(OH)D3 (EQUIVALENT TO 2 000 000 UI OF VITAMIN D3) PER TON; 3. LOW CALCIUM LEVEL DIET AND 4. LIKE 3 PLUS 69 MG OF PURE 25-(OH)D3 PER TON. SORGHUM SOYBEAN MEAL DIETS WERE EMPLOYED FOR ALL TREATMENTS, AND THOSE WITH HIGH CALCIUM LEVELS CONTAINED 3.75% CALCIUM, 0.4% OF AVAILABLE PHOSPHORUS (AP) AND 16% OF CRUDE PROTEIN (CP), WHEREAS LOW CALCIUM LEVEL DIETS CONTAINED 4.1% CALCIUM, 0.3% AP AND 16% CP. IN EXPERIMENT 2, HIGH CALCIUM LEVEL DIETS CONTAINED 3.75% CALCIUM, 0.3% AP AND 15% CP, WHEREAS LOW CALCIUM LEVELS CONTAINED: 3.25% CALCIUM, 0.25% AP AND 15% CP. RESULTS FROM EXPERIMENT 1 AFTER 10 WEEKS SHOWED SIGNIFICANT DIFFERENCES AMONG TREATMENTS (P < 0.05) IN EGG PRODUCTION AND EGG MASS FOR LOW CALCIUM DIETS. EGG SHELL THICKNESS WAS BETTER (P < 0.05) WHEN 25-(OH)D3 WAS ADDED TO THE DIET. RESULTS FROM EXPERIMENT 2 AFTER 10 WEEKS INDICATED THAT EGG SHELL THICKNESS WAS BETTER (P < 0.05) WHEN 25-(OH)D3 WAS ADDED. THIS INFORMATION SHOWS THAT WHEN 25-HYDROXYCHOLECALCIFEROL IS ADDED TO DIETS CONTAINING VITAMIN D3 ON ISA BABCOCK B-300 LAYERS AND MOLTED HEN DIETS, EGG SHELL QUALITY IS IMPROVED.