1. The effect of biotin supplementation of low-biotin practical diets during rearing and laying stages on performance was studied in White Leghorn-type laying hens. 2. Biotin supplementation during rearing did not have any apparent effect on the condition of the bird at point-of-lay or on subsequent laying performance. 3. Biotin supplementation during lay did not have any beneficial effect upon...

Ammonia (NH3) emissions from laying hens are affected by nutrient content of the diet, manure quantity, and manure properties such as moisture content, nitrogen content, and pH. These production traits may vary with strain of the hen. However, limited information is available concerning the effects of laying-hen genetics on manure properties and NH3 emission. This study was conducted to compara...

An important source of human salmonellosis is the consumption of table eggs contaminated with Salmonella enterica serovar Enteritidis. Optimization of the various surveillance programs currently implemented to reduce human exposure requires knowledge of the dynamics of S. Enteritidis infection within flocks. The aim of this study was to provide parameter estimates for a transmission model of S....

Theaim of this research was to evaluatethe effect the addition bio-herbal as a feed additive on consumption,hen day production, egg ratioand mortality laying hens. The materialsin experiment used200 hens Hyline strainage 28to 36 weeks (reared for 60 days). method used in study an invivoexperimental using Completely Randomized Design (CRD) with treatmentsconsisting P0 = drinking water without bi...

The aim of this study was to determine the production performance layer hen strain Hy-Line Brown in different cage locations closed house. research material 5,051 laying hens aged 28 weeks. House system house, arranged form frame A. were housed at densities 500 cm 2 per hen. Research feed is complete code 324 KJ produced by PT. Charoen Pokphand Indonesia. method comparative, comparing on locati...

The profiles of total lipids and of the molecular species of individual lipid classes were compared among corresponding lipoproteins of plasma and yolk of the laying hen. A close qualitative correspondence was found in the makeup of the molecular species of glycerophospholipids and triglycerides of the very low density lipoproteins and the high density lipoproteins of plasma and yolk. There was...

Egg production rate is a positive economical factor in commercial laying hens. In egg industry, the only source of income is the number and weight of eggs laid in a laying cycle, therefore, researchers have been trying to find approaches to increase the egg number in each laying cycle. In general, a hen lays eggs in clutches with a pause of one or a few days in between the clutches (pause days)...

This perspective on Romero et al. (beginning on p. 792 in this issue of the journal) discusses the available animal models of ovarian cancer, including the laying hen, non-human primate, and transgenic rodent models, and their relevance to ovarian cancer chemoprevention studies.

the aim of current study was to determine the effects of vitamin c on bone mineral density (in terms of osteoporosis), eggshell quality and investigation of correlation between these factors in laying hens reared under normal condition. one hundred and ninety two 24 - weeks - old laying hens diet was supplemented with 4 levels of vitamin c (0, 250, 500 and 750 mg/kg diet). the experimental desi...