Parathyroid glands from laying hens were also  xed in percent glutaraldehyde in phosphate buffer (0.1 M, 7.3 pH) for araldite embedding and used for electron microscopy. For routine histological observations, sections of 5 to 6 um thickness were cut and stained by, Mayer’s haemalum and eosin-phloxine, Masson’s trichrome, Crossman’s modi cation of Mallory’s triple stain, van Gieson’s method fo...

Age of market weight of broilers has been continuously reduced by approximately one day per generation during the past 40 50 years due to an average increase of 50 g/year of body weight at 42 days of age (Gyles, 1989). Although non-genetic factors such as improved feeding and management contributed to this growth rate increase, genotypic selection for growth seems to be the major cause (Chamber...

The body needs vitamin D3 for a number of metabolic processes, such as healthy bone development, calcium phosphate absorption, and immune system stimulation. This study investigated the impact UVB exposure (3 hours per day) on levels calcium, phosphorus, in serum crossbred (White Leghorn N strain Desi) layer chickens from 29 to 40 weeks age. In order achieve optimal light featherless skin bird ...