Two trials were conducted to determine B cell changes in Peyer’s Patches (PP) and Cecal Tonsils (CT) of specific-pathogen-free Single …
A 6-week study was conducted to investigate the effects of phytase and hydro alcoholic extract of Withania somnifera root (WS) …
A trial was conducted to study the influence of CP and fat content of the diet on performance and egg …
Moulting is a complex process, induced by diet manipulation, which results in renewal of reproductive system and subsequent better production. Conventionally, moulting has been practised by utilising feed withdrawal in many developing countries, however, this has been associated with many drawbacks. Alternative types of moulting practices have been studied, however, these are not practised widely …
Egg-laying strains of chickens are highly susceptible to osteoporosis, a non infectious disease characterized by a decrease in structural bone as hensage. To minimize the onset of osteoporosis, it was hypothesized that a delay in sexual maturity may allow a pullet to develop a stronger skeletal frame before egglaying, leading to improved skeletal mineralization atend …
The aim of this trial was to determinethe effect of aerial perches on keel bone injuries andtibia bone characteristics in free-range laying hens. The relationship between keel bone injuries and individual bird parameters, such as weight, girth, wing:girth ratio,feather coverage, and tibia bone characteristics, was also assessed. Five commercial free-range houses, each containing between 7,000 …
Gregarious nesting can be defined as a behaviour that occurs when a laying hen (Gallus gallus domesticus) given the choice …
The relationship between immune function and disease risk may be greatly influenced by an organism’s response to chronic stressors including …
This study was performed with pullets to evaluate the effects of dietary yeast extract on bird performances and feather pecking. A total of 2400, 10-weeks-old pullets were divided into 8 groups: C, R,L and LR are control, feed restriction (from 09h00 to 15h00), litter removal (from 12 to 17 weeks of age) and both feed …
Recent studies in laying hens have shown that feather peckers eat more feathers than nonpeckers.We hypothesized that food pellets containing feathers would decrease the birds’ appetite for feathers and thereby also decrease feather pecking. To separate the effect of feathers from that of insoluble fiber per se, additional control groups were fed pellets containing similar …
Environment, Well – Being and Behaviour
Four genetic stocks of Leghorn pullets were used to evaluate the effects of genetic selection on growth and fearfulness behavior. Three of the stocks were the Ottawa random bred control stocks from 1950 (CS5), 1959 (CS7), and 1972 (CS10). The fourth stockwas a 1993 commercial laying stock (CCS) whose ancestors were involved in the formation …
1. The study investigated the feeding of a high oil and fibre diet containing 260 g/kgorganically produced cold pressed sunflower …
Laying hens have a unique bone turnover due to the daily egg laying cycle. Laying hens have three distinctive kinds …
Several studies have shown a high prevalenceof keel bone deformities in commercial layinghens. The aim of this project was to assess theeffects of perch material, a vitamin D feed additive(25-hydroxyvitamin D3; HyD, DSM Nutritional Products,Basel, Switzerland), and genetics on keel bonepathology. The study consisted of 2 experiments. In the first experiment, 4,000 Lohmann Selected Leghornhens …
In the commercial poultry industry, feather pecking leads to damage to the chickens and anincreased mortality rate. The effects of two (possible) feather pecking prevention methods,infrared trimming and maternal care, on production parameters, fear, sociality, learning,feeding behavior, and feeding motivation were examined in young Silver Nick hens. Thirty-nine Silver Nick hens were tested from the …
In order to develop better control measures against avian influenza, it is necessary to understand how the virustransmits in poultry. …