Studies on some nutritional requirements of some local strains of laying hens

Abstract: The present study was carried out at EI-Gimmizah Poultry Research
Farm in EI-Gahrbia governorate, Agriculture Research Center (ARC),
Ministry of Agriculture, Egypt, from October to November 2005.
The objective of the present studies was to evaluate the effect of using three different sources of selenium: Sel-PlexTM (SP-organic), OSY-NRCE (ON-organic) and sodium selenite (SS, 45 % Se) at levels of 25, 50, 100, 200 and 400 µg/kg diet of Gimmizah layer strain. Such evaluation was carried out under the stress of the presence of 250 mEq of peroxide number/kg of oil obtained by oxidized palm oil dietary supplementation. Layers performance, produced egg quality, egg selenium concentrations, digestion coefficients of nutrients and some feeding values of the experimental diets were determined for the purpose of evaluation and comparisons.
A total number of birds 306 (255 layers and 51 cocks) 35 wks old of
Gimmizah strain were randomly divided into seventeen equal group (15 layers and 3 cocks/group) allotted to the seventeen experimental diets. Birds were housed individually in separate standard galvanized layer cages (open system). Prior to the study the com, soybean meal and wheat bran that composed the basal diets were analyzed for CP and ME contents which were 16.5 % and 2745 kcal/kg, respectively, and for total selenium contents which was 0.13 mg/kg diet and fed to the experimental birds till the start of the experiment. The experimental diets were formulated to be isocaloric -isonitrogenous according to the nutritionally requirements recommended by NRC (1994). Feed and water were provided ad-libitum. Photoperiod was 17 h. (natural and artificial) and the ambient temperature ranged from 20 - 23°C. Birds of the first group were fed the basal layer diet [containing the adequate level of Se (0.13 mg/kg diet, as nutritionally recommended by NRC, 1994) and served as positive control diet (+Cont)]. Whereas, birds of the second group were fed the basal diet which contained the oxidized palm oil and free from Se supplementation and served as negative control diet (-Cont). Birds from the third to seventeenth groups were fed the basal diet of negative control and supplemented with either, SP, OS or SS as sources of selenium. Each source of Se was supplemented at five experimental dietary levels (25, 50, 100, 200 and 400 µg/kg diet). The experiment lasted for 8 wks.
Main important results could be summarized as follow:
1- Group fed the positive control diet (+Cont) resulted in statistically the
highest values of body weight, change in body weight and daily feed intake and the lowest percentage of mortality. Whereas, those fed SP-diets recorded the lowest values of feed conversion ratio (kg feed/ kg eggs). The same trend was obtained with those fed the highest level of Se supplementation (400 µg/kg diet) in the same order.
2- Addition of SP showed the highest rates of egg production, however, the best values of egg weight, number and mass were obtained with group fed +Cont diet. Level of 400 µg Se/kg diet recorded the best values of all egg production criteria.
3- Birds of +Cont and those fed 400 µg of Se/kg diet recorded the highest values of determined digestion coefficients of nutrients (DM, OM, CP, EE, CF and NFE, %) and estimated feeding values [NB (%) and ME (kcal/kg diet)].
4- Addition of SP resulted in the highest values of retention of selenium in the chicken bodies.
5- SP resulted in statistically the highest value of yolk Se concentration and albumen Se concentration.
6- Birds fed +Cont diet recorded the highest values of egg shape index, shell and yolk quality studied criteria and Haugh units score and the lowest percentage of albumen.
7- Group fed+ Cont and 400 µg Se/kg diet groups showed the highest percentages of fertility, hatchability and newly hatched chicks-weight and the lowest values of embryonic mortalities.
8- In general, based on obtained experimental results reported herein, it may be concluded that there are some beneficial effects of selenium supplementation (especially organic source, Sel-PlexTM) at level of 400 µg Se/kg in laying hen diets to alleviate the adverse effects of oxidized fats. It is also favorite to conclude that further researches are needed to understand and make use of all the beneficial effects of Se in laying hens nutrition.
Publication year 2010
Pages PP. 124
Availability location مكتبة معهد بحوث الانتاج الحيوانى - شارع نادى الصيد - الدقى - جيزة
Availability number 1148
Organization Name
Country Egypt
Author(s) from ARC
Agris Categories Animal feeding
Layer chickens. Selenium. Stress.
Proposed Agrovoc Gimmizah layer strain;oxidized palm oil;Layers performance;egg quality;egg selenium concentrations;digestion coefficients;feeding values;organic source;
Publication Type PhD Thesis