|
|
Effect of Yucca shidigera extract and aluminum chloride on pen's atmospheric ammonia, productive, reproductive and physiological performance of Silver Montazah cocks
|
|
Abstract: The present study aimed to investigate the effect of different molting procedures on the post molt performance and some physiological traits. Two hundred and seventy Hy-Line laying hens aged 60 weeks were randomly chosen from a large commercial flock. All hens were approximately of an equal body weight and similar performance.
Birds were divided into three groups. Birds of the first group (30 birds) were fed ad-libitum and considered as control. The second group (120 birds) was force molted by adding 1% zinc oxide on diet for 14 days.
. While birds of the third group (120 birds) were force molted by feed restriction (25%) for 7 days then fasting fore subsequent 7 days.
At the end of the force molting treatments (14 days) when hens completely ceased egg production, the2nd and 3rd groups were equally divided into 4 subgroups each (30 birds each) and injected as follows:-l-Distilled water (1 ml)for 6 days. 2- Estradiol 17 β(10 mg/ml)for 6 days. 3-Indomethacin (10 mg/ml) for 3 days then Bromocriptine (10 mg/ml) for 3 days. 4- Human Chorionic Gonadotrophin (HCG) 50 IV for 6 days.
Results indicated that: All force molting treatments, applied caused significant decrease in live body weight. Force molted hens fed 1% zinc and injected with estradiol had the highest average of body weight after molting followed by non-molted hens then by those of fast molted hens injected with indomethacin and promocreptine. Fast molted hens injected with estradiol had significantly the lower average of feed consumption at all experimental intervals and significantly improved feed conversion
compared with all treatments applied. Hens fed 1% zinc and injected with either HCG or estradiol 17 β had the highest grand mean average of egg production. Fast molted hens injected with HCG had the highest averages
of egg weight and egg mass. Plasma estradiol level was higher in fast molted hens injected with HCG and their corresponding zinc at 4th and 8th weeks- after molting, respectively. Force molted hens by zinc and injected with distilled water had significantly the highest levels of plasma progesterone. Appling fasting as a method of force molting significantly decreased plasma T3 and increased plasma T4level.
From this study, it could be recommended to use fasting to force laying hens to rest and injected with either estradiol or HCG, respectively to improve productivity of laying hens during the second laying cycle.
|
| Publication year |
2009
|
| Pages |
337-356
|
| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
|
| Availability number |
|
| Organization Name |
|
| City |
الاسكندرية
|
| serial title |
Egyptian Poultry Science
|
| ISSN |
1110-5623
|
| Author(s) from ARC |
|
| Agris Categories |
Animal physiology - Nutrition
|
AGROVOC
TERMS |
Air pollution.
Ammonia.
Cocks.
Performance testing.
Reproductive performance.
Yucca.
|
| Proposed Agrovoc |
aluminum chloride;
|
| Publication Type |
Journal
|