| Titles |
|
English :
|
The effect of dietry humic acid supplementation on some productive and physiological traits of laying hens
|
|
Arabic :
|
تأثير اضافة حمض الهيوميك للغذاء على بعض الصفات الانتاجية و الفسيولوجية في الدجاج البياض
|
|
| Abstract |
This study was designed to investigate the effect of addition humic acid to the developed laying hen diets on egg production, egg quality and some physiological traits. At 20 weeks of age one hundred and twenty hens of Gimmizah strain were divided at random into three equal groups and represented 40 hens for each one. The first group was fed on a basal diet and served as control, the second and third groups were fed on a basal diets supplemented with 100 mg or 200 mg humic acid /Kg diet, respectively for a period of 24 weeks. The results were summarized as follow:
Live body weight and feed consumption were not significantly affected by humic acid supplementation, while live body weight was significantly (P ≤ 0.05) increased by developing hens age.
Supplementation of humic acid to the laying hen diet caused significant (P ≤ 0.05) increase in egg weight and egg production percentage compared with the control group Also, these traits were significantly (P ≤ 0.05) increased as the hen age increased. While the age at the first egg was significantly (P ≤ 0.05) decreased in the groups fed humic acid, this reduction is related to the decrease of first egg weight. Therefore, addition of humic acid to laying hen diet could induce precocious sexual puberty.
No significant effect of humic acid supplementation on egg shape index, albumin (%), Haugh unit and egg yolk index. These traits were not significantly affected by hen's age. Whereas, egg shell weight percentage and shell thickness were significantly (P ≤ 0.05) increased compared with the control group. Moreover, shell thickness significantly (P ≤ 0.05) increased at 32, 38 and 44 weeks of age.
Addition of humic acid (especially with high level) to the laying hen diets caused a significant (P ≤ 0.05) increase in RBC`s, WBC`s, hemoglobin, plasma calcium and total protein compared with other groups. The highest values of WBC`s, hemoglobin and plasma total protein were observed at 44 weeks of age. While plasma albumin, GOT, GPT and T3 concentrations did not significantly affected by humic acid supplementation or the hen's age.
Relative weights of spleen, ovary and oviduct length were significantly (P≤ 0.05) increased with higher dose of humic acid compared with the control. Whereas, humic acid supplementation had no significant effect on relative weights of carcass, liver, gizzard, heart and oviduct.
It can be concluded that supplementation of humic acid to laying hen diet especially with the higher dose (200 mg/ Kg diet) can be used to improve egg production traits, shell quality, some physiological and immunity traits.
|
| Publication year |
2008
|
| Pages |
1043-1058
|
| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
|
| Availability number |
|
| Organization Name |
Animal Production Research Institute (APRI)
|
| City |
الاسكندرية
|
| serial title |
Egyptian Poultian Science
|
| ISSN |
1110-5623
|
| Author(s) from ARC |
|
AGROVOC
TERMS |
Egg production.
Humic acids.
Layer chickens.
|
| Proposed Agrovoc |
physiological traits;egg quality;egg quality;egg weight;
|
| Publication Type |
Journal
|