Calcium and zinc levels in laying hens diet: Effect on egg production performance
CHANDRA DEO, H.P.SHRIVASTAVA, PRAVEEN K.TYAGI AND D.P.SINGH
Central Avian Research Institute, Izatnagar - 243 122 (U.P.)
An experiment was conducted to study the response of graded levels of dietary calcium (2.5 & 3.0%) and zinc (30, 50 and 80 mg/kg) on egg production performance of naked neck x WL layers during 31-47 weeks of age (112 days) through a 2x3 factorial experiment. Six experimental diets of desired calcium and zinc levels were prepared by supplementing limestone and zinc sulphate in desired proportion. Each of such diets was offered to 17 laying hens reared in individual cages. Daily egg production and individual egg weight were recorded. Weekly feed intake were recorded and feed conversion ratio (FCR) both for (kg feed intake/kg egg mass) and net feed efficiency ratio (kg feed intake/kg egg mass-loss in body weight) were calculated. Results indicated that the hen day egg production, egg weight, feed intake, feed conversion ratio and net feed conversion ratio did not differ significantly due to either main effects or interaction of various combinations of calcium and zinc levels in the diet. However, diet having 3.0% calcium and 30mg/kg zinc showed numerically higher percent egg production than the other dietary combinations. It is concluded that a dietary level of 3.0 percent calcium and 30mg/kg zinc was found optimum for egg production performance in naked neck x WL layers.