الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 158 |  |  |
| | | from | 158 | | |
Abstract
Experiments of the present study were carried out in farm UNITED POULTRY COMPANY (VALIGI MAAMOUN) of poultry production in Monofia Governorate, Egypt during the period from January to Jun 2003. The laboratory work and histological part were carried out at the laboratories belonging to the Animal production Department at Moshtohor Faculty of Agriculture, Zagazig University, Benha Branch, Egypt.
Tow hundred Hubbard laying hen and twenty cocks at 37 weeks of old were used. The experimental work aimed to study the effects of addition different levels of sodium chloride in feed supplement on egg production and egg quality, traits. The rate of calcium absorption, some physiological and histological traits
were also determined.
1— Increasing of NaC1 levels from 0.225% to 1% were significantly decreased body weight in laying hens but body weight was significantly increased (P<0.01) thereafter with levels of 1.255% NaCI.
2-Egg production rate decreased significantly (p<0.001) by increasing sodium chloride level (1.25%), while means of egg production were significantly higher in third group (31.27 / 50 hen / day) which received 1% NaC1 compared with control group (0.225% NaCI).
3-Time feed consumption for birds increased with increasing of sodium chloride level, the maximum time feed consumption showed for group received 1.25% sodium chloride compared
Summary 115
with control group (0.225% NaCI)and other treatment group (0.5% and 1%) NaC1, but daily feed consumption due to the treatment groups was found to be highly significantly (p<0.001) decreased by increasing age of birds.
4-There were significant effect (p<0.01) of the treatment on respiration rate at different age thus the overall means of respiration rat per /hen / minute at 62 week of age were significantly higher in the fourth group, the average was 39 once /min.
5-Body temperature had significantly (p<0.01) difference between treatments and different ages, the highest body temperature at 62 week of age was (41.7 C°) in control group followed by those in second group (41.2 Ca) , fourth group (41 C°) then third group (40.9 C°)*
6-There were insignificant different between all treatments in egg weight, shell thickness, shell weight, yolk weight albumin weight and [moisture] in egg, but there were significant (p<0.01) different between treatment in, protein, fat contents, sodium and potassium concentration in egg. As well as effect of age on egg weight, shell weight was significantly effected (p< 0.001). Effect of age and treatment interaction was significant in shell weight only.
7-Highly significant (P<0.01) variation in moisture and fat percentage were found among treatment of different levels of NaC1, but there was no significant effect for protein percentage, sodium and potassium concentration in carcass.