Effect of Zinc Toxicity in Laying White Leghorn Pullets and Hens

Early access to perches in caged White Leghorn pullets.

Osteoporosis, a progressive decrease in mineralized structural bone, causes 20 to 35% of all mortalities in caged White Leghorn hens. Previous research has focused on manipulating the egg laying environment to improve skeletal health, with little research on the pullet. The objective of the current study was to determine the effect of perch access on pullet health, bone mineralization, muscle d...

Effect 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...

Relationship 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...

Interactions of dietary zinc and vitamin D in laying hens.

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.