Evaluation of Dietary Calcium Requirements in Fayoumi Laying Hens
The experiment was carried out in poultry experimental station belonging to NRC, Cairo, Egypt. A total of 120 Fayoumi layers, 45 weeks old, were randomly divided into four equal groups. Each group included three replicates (10 hens in each). The first group was fed the control diet containing 3.3% gram Ca, whereas, the other three received diets containing 2.8, 2.6 and 2.4% gram Ca, respectively. Calcium was added to the ration in the form of limestone. The results of the present study clearly indicated that there were no significant differences among groups fed diets containing different levels of Ca (2.4 up to 3.3 g%) in egg production, egg weight, egg mass, daily feed consumption and feed conversion efficiency(P>0.05). The control group displayed the lowest percentage of fertility (59.33) and hatchability (42), and the highest percentage of embryonic mortality (17.33), while the best results of the reproductive performance were recorded from the fourth group fed diet containing 2.4% Ca. Measurements of egg characteristics indicated no significant differences among groups (P>0.05); however, yolk color was slightly improved in the fourth group at six weeks of treatment. Shell percentage and thickness tended to increase in the fourth group particularly after 12 weeks of treatment. In conclusion, dietary calcium levels (2.4 up to 3.3%) did not significantly influence egg production, egg mass, feed conversion efficiency and egg quality (P>0.05). However, low level of dietary calcium (2.4%) has improved egg fertility, hatchability and shell percentage and thickness. A percentage of 2.4% of calcium in the diet is recommended for Fayoumi laying hens
the experiment was carried out in poultry experimental station belonging to nrc, cairo, egypt. a total of 120 fayoumi layers, 45 weeks old, were randomly divided into four equal groups. each group included three replicates (10 hens in each). the first group was fed the control diet containing 3.3% gram ca, whereas, the other three received diets containing 2.8, 2.6 and 2.4% gram ca, respectivel...متن کامل
The current experiment was designed to evaluate the efficacy of adding the multi-enzyme mixture (Natuzyme) into layers' diets with different levels of energy and available phosphorus in relation to laying performance, egg qualities, blood cholesterol level, microflora and intestinal viscosity. Two hundred and fifty 43-wk-old Hy-Line commercial layers were divided into five groups with five repl...متن کامل
This experiment was designed to evaluate the effects of different sources of calcium at different rates and cholecalciferol(Vitamin D3) on the performance and egg quality of Hy-line W-36 Laying hens. In this study a total of 648 hens were managed in a completely randomized design using a factorial arrangement of 3 × 3 × 2 treatments, with three calcium sources (oyster shell, OS; ground limeston...متن کامل
Dietary interaction of 1,4-diaminobutane (putrescine) and calcium on eggshell quality and performance in laying hens.
An experiment was conducted to evaluate the potential dietary interaction between 1,4-diaminobutane (putrescine) and calcium on eggshell quality and overall laying performance. One hundred ninety-two 30-wk-old White Leghorn hens were fed a corn-and soybean-meal-based diet supplemented with 0.00, 0.05, 0.10, or 0.15% putrescine and 2.5, 3.0, 3.5, or 4.0% calcium in a factorial design (12 birds p...متن کامل
White Leghorn hens were fed diets containing 0, 300, 600, or 1200 ppm technical grade DDT for three 28-day periods. The 1200 ppm diet caused tremors and 33% mortality in the final period, but no gross toxicity symptoms were seen in birds fed the other diets. Egg production was decreased during the third period by 600 or 1200 ppm. Egg weight was decreased during the third period by 600 or 1200 p...متن کامل
دوره 1 شماره 2
صفحات 81- 86
تاریخ انتشار 2011-06-01
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