Studies Of Coated Ferrous Sulfate On Vitamin A Stability And Its Bioavailability For Weaned Piglets

To determine coated ferrous sulfate used in feed and animal producing, first, multiple linear regression design was adopted to evaluate the effect of coated ferrous sulfate on vitamin A stability in premix under condition of 37℃ during Od 15d 30d 45d. Then, the second experiment was conducted with 54 piglets(DXLXY; 6. 0 + 0. 5kg) weaned at 21d to estimate bioavailability of coated ferrous sulfate and the effect of the iron on parameter of physiological and biochemical and nutriment digestibility . 2X5 factorial design was used in the experiment. Basal diets (as-fed basis) containing corn and sorybean meal was used during 28d.The results indicated:â‘ Under the condition of 37℃, vitamin A stability was affected by coated ferrous sulfate. Vitamin A was destroyed by 18.90% from the addition of Fe(150mg/kg) during 45d. Vitamin A stability was affected mainly during front 15d from the addition of Fe(150mg/kg). Up to 16. 08%, taking up 85. 08% of overall period. The loss rate of vitamin A from per Fe in premix was 0. 041IU and 0. 009IU if residual effects were fixed. Coated ferrous sulfate contributed to 22.26% and 10. 18%of total loss during 30d and 45d respectively. â‘¡Coated ferrous sulfate could increase ADG and improve F/G relative to basal diet treatment. â‘¢Crude protein digestibility was significantly affected by dietary Fe sources. There was a tendency improved in ADG and F/G from coated ferrous sulfate. â‘£Hemoglobin and serum Fe were significantly affected by dietary Fe source. Iron average daily absorption .hemoglobin, hematocrit,red blood count, and serum Fe increased linearly (P<0.05 or P<0.01)with incteasing dietary Fe level. ?By the slope-ratio technique, analysis showed that iron average daily absorption, Hemoglobin, serum Fe were sensitive indicator. If Fe from FeSO₄.7H₂O was set at 100%, the relative bioavailability values was estimated to be 130.91% for coated ferrous sulfate.