An-Najah Blogs :: An-Najah Blogs :: en-us Mon, 26 Oct 2020 14:31:24 IST Mon, 26 Oct 2020 14:31:24 IST Effect of Light Stimulation and Body Weight on Reproductive Performance of Broiler Breeder Hens ArticlesAn experiment with broiler breeder pullets was undertaken to determine the effect of pattern of light stimulation and pullets body weight at 20 wk of age on various production parameters body weight and age at onset of lay Two light stimulation treatments were used: abrupt ALS and step-up SLS Pullets were randomly assigned to one of three body weight groups: low weight 1800 g medium weight 2200 g or heavy weight 2600 g at 20 wk of age The results obtained indicated that pattern of light stimulation and weight at 20 wk did not markedly affect egg production however pullets exposed to SLS or ALS produced the lightest eggs A numerical advancement occurred in age at first egg due to SLS Significant weight gain occurred in low weight pullets due to SLS The results of this experiment indicated that SLS of low weight broiler breeder pullets represents a viable means for Increasing weight gain and advancing onset of egg layingEFFECTS OF EARLY CHLORTETRACYCLINE ArticlesThree broiler trials were conducted to age of 7-days 21-days and 42-days for trials I 2 and 3 respectively In trial 1 two treatments were used: 1 the control c in which chicks received no preventive medication in the form of chlortetracycline tetracycline HCL; 2 preventive medication m-7 in which one day old chicks were given a preventive course for seven days of chlortetracycline at 05 gL drinking water In trial 2 three treatments were used: treatments 1 c and 2 m-7 where similar to those in trial 1; however chicks in treatment 3 m-10 were given the preventive course for 10 days In the third trial four treatments were used 1 common broiler house clean-out and chicks were given no medication c-nm; 2 common broiler house clean-out and one day-old chicks were given a preventive Effect of Feeding Natural Zeolite on Performance of Laying Hens Drinking ‎Saline Water ArticlesThis experiment was conducted to determine the effects of dietary natural zeolite on performance of laying hens receiving saline drinking water 2g NaClL One hundred and twenty 49 weeks old laying hens were randomly assigned two birds per cage to 60 cages in a naturally ventilated laying house Six treatments were examined over a 28-day period Control hens received town water and a commercial layer diet TW-LD Hens of treatment 2 were given town water and were fed a commercial diet supplemented with 10 gKg natural zeolite TW-Z10 The remaining four treatments received the water containing 2g NaClL SalW- and a commercial diet supplemented with 0 10 20 and 30gKg natural zeolite for treatments 3 SalW-LD 4 SalW-Z10 5 SalW-Z20 and 6 SalW-Z30 respectively To account for differences in the amounts of added zeolite sand was added to the diet in order to keep the resulted diets isoenergetic Egg production egg weight egg mass output daily water intake feed consumption feed conversion and eggshell quality parameters were measured No significant treatment effects were observed with percentage egg production egg weight egg output feed conversion and feed consumption among the different treatments However water intake for hens in treatment 5 was significantly higher than that of hens in the remaining treatments Significant differences between treatments were observed with regard to all shell quality measurements other than egg specific gravity Saline water caused a significant reduction in shell thickness shell weight: egg weight and shell weight per unit surface area Addition of natural zeolite 10 to 20g improved eggshell quality parameters especially for hens receiving saline water An-Najah University Journal for Research - Natural Sciences A ISSN: 1727-2114 Volume 17 Issue 2 2003 Pages: 183-189Environmental Heat Stress Does Not Reduce Blood Ionized Calcium Concentration in Hens Acclimated to Elevated Temperatures ArticlesChanges in blood concentrations of ionized calcium and total calcium were measured in broiler breeder hens 42 wk old relative to egg cycle and environmental temperatures Two environmental temperature treatments were used: 1 temperature cycled daily from a low of 10 C at 0300 h to a high of 25 C at 1600 h; and 2 temperature cycled from a low of 21 C at 0300 h to a high of 39 C at 1600 h Serial blood samples were collected from five laying hens per temperature treatment via cutaneous ulnar vein cannula beginning at the time of oviposition and every 4 h thereafter until the next oviposition Neither blood concentration of ionized calcium nor total plasma calcium was affected by temperature Results suggest that the supply of calcium available in blood for shell deposition is not diminished in hens acclimated to high environmental temperaturesInteraction of Feeding Time and Temperature and Their Relationship to Performance of the Broiler Breeder Hen ArticlesExperiments with broiler breeder hens were undertaken to determine effect of feeding time and environmental temperature on various production variables body weight and feed consumption Two temperature treatments were used: low cyclic temperature 10 to 25 C and high cyclic temperature 21 to 39 C The three feeding treatments were: fed one daily meal either at 0700 h Treatment 1 or 1800 h Treatment 2 or one-half the daily amount at 0700 h and the other half at 1800 h Treatment 3 In another experiment hens were assigned to feeding times of either 0700 or 1800 h Feeding time and temperature did not markedly affect rate of egg production; however hens at high temperature fed two meals per day produced the fewest eggs High temperature caused significant reductions in egg weight specific gravity and shell thickness Feeding time and temperature had no effect on time of oviposition ovulation or the transit time of the egg through the oviduct Significant body weight loss occurred in hens at high temperature and fed at 0700 h Both high temperature and feeding one-half of the daily feed at 0700 and the other half at 1800 h caused a reduction in feed consumption