Biological and Economic Optimum Level of Calcium in White Leghorn Laying Hens
نویسندگان
چکیده
منابع مشابه
The Histological Studies of Parathyroid' Gland in Laying White Leghorn Hens (Gallus domesticus) in Relation to the Serum Calcium Level
The parenchymal cells recorded were dark chief, 21.33%; intermediate, 73.46% and light chief, 5.20% and their dimensions (in microns) were, 17.30 ± 4.49, 19.98 ± 4.15 and 850 ± 8.49, respectively, and mean of serum calcium was 49.66 mg/100 ml.
متن کاملEvaluation 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, respectivel...
متن کاملRelationship between Intersequence Pauses, Laying Persistency and Concentration of Prolactin during the Productive Period in White Leghorn Hens
Prolactin is considered to influence the taking of pauses in between ovulatory sequences in White Leghorn hens. Therefore modulating concentrations of prolactin using bromocriptine a dopamine agonist during early life (17 to 36 weeks of age) could overcome the inhibitory effects of high concentration of prolactin on ovarian activity. The effect of modulation of prolactin concentration on egg pr...
متن کاملEffect of Different Levels of Dietary Crude Protein, Lysine and Methionine on Performance of White Leghorn Laying Hens
Objective: An experiment was conducted to study the effect of feeding of different levels of dietary crude protein (17.5, 16.5 and 15.5%) with varying levels of lysine (0.77, 0.73 and 0.68%) and methionine (0.36, 0.34 and 0.32%) on performance of white leghorn layers from 34-53 weeks of age. Methodology: Each diet was fed ad libitum to 12 replicates consisting of 88 birds in each replicate. Egg...
متن کاملEffects of long-term calcium deficiency on the electro-and echocardiography in laying hens
Background: Ca is the most important minerals in the body that plays a key rols in the physiological activities, anzymatic reaction and the regulation of myocardial contraction and relax-ation. Ca deficiency causes the heart failure and decrease cardiac contractility. OBJECTIVES: To determine the effects of long-term dietary calcium deficiency on the heart function of layer hens based on the el...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Poultry Science
سال: 2004
ISSN: 0032-5791
DOI: 10.1093/ps/83.6.868