الفهرس | Only 14 pages are availabe for public view |
Abstract The present study was carried out at the experimental farm of Animal Production Department, Faculty of Agriculture, Minia University. The aims of the present work were to study the effect of active dry yeast (ADY) and (ADY) plus Iodine supplementation in the ration of lactating buffaloes on: 1- Milk yield and it’s composition. 2- Digestibility and the feeding value. 3- Some hematological, hormonal and biochemical parameters in plasma. 4- The sensitivity of yeast cells to different doses of iodine in the culture. The two feed additives were active dry yeast (20g/h/d) and active dry yeast (20g/h/d) plus 1.3 mg potassium iodide / kg dry matter intake. Active dry yeast are increasingly used in ruminant nutrition as feed additives to improve feed efficiency and performance and, at the same time, to prevent health disorders, while iodine is an essential dietary element for mammals, required for the synthesis of the thyroidal hormones; thyroxin T4 (tetraiodothyronine) and its active form, T3 (triiodothyronine). Thyroidal hormones play a major role in the growth and control of several metabolic processes. Body weight change, dry matter intake, nutrients digestibility, milk and milk constituent yields and some physiological responses were parameters chosen to judge the effect of ADY and Iodine supplementation in lactating buffaloes ration. Three experiments were conducted in this study. |