Leeson, 2004 – Changes in light intensity during the rearing period can influence egg production in domestic fowl
1. A total of 240 Shaver White and 240 ISA Brown pullets that had been reared in multi-bird cages on …
1. A total of 240 Shaver White and 240 ISA Brown pullets that had been reared in multi-bird cages on …
The age at which sexual maturity occurs in layers can affect flock performance, egg size, and flock income. In this …
The chicken eye can discriminate light color, and different light wavelengths affect egg quality. In this study, we used blue …
Two experiments were conducted in successive years to determine the performance of pullets lighted at 16, 18, or 20 wk. …
The early rearing environment plays an important role in the development of many behaviour patterns and it has been shown …
In 2 trials, including 2,768 birds in total, 3 different perch arrangements were evaluated in furnished 8-hen cages for laying …
1. In order to investigate the effect of perch width on perching behaviour of laying hens, two experiments in which …
This paper describes how birds move between horizontal perches at different heights with different angles separating them, using the time …
For night-time roosting domestic fowl show a strong priority for high perches. Following the anti-predator hypothesis the height of a resting site should however be more important for the fowl than roosting on a perch. Here we tested whether laying hens prefer high resting areas without perches compared to low resting areas with perches. In …
1. The EU laying hen directive, which bans standard battery cages from 2012, has implications for animal welfare, particularly since housing laying hens in extensive systems, while increasing natural behaviour and improving bone strength, is associated with a greater level of bone fractures, predominantly of the keel bone, compared to birds housed in cages. 2. …
Free-living hens roost on branches in trees at night, and laying hens in aviary systems or cages provided with perches also make extensive use of these for night-time roosting. It is therefore suggested that roosting on perches is important to the hens and that domestic hens should be provided with perches in order to promote …
Laying hens housed in extensive systems may be at risk of injury when many birds compete for use of the same perch space. Experiments were carried out to determine the space required by laying hens to move between obstructed perches. Eighty Lohmann Brown layer hens were reared in floor pens fitted with perches from 1 …
Eighty Lohmann Brown layer hens were reared in floor pens fitted with perches from 1 day of age. After the peak of lay (25 weeks of age), their ability to jump to and from perches in different light environments was assessed in two experiments using digital video techniques that allowed detailed measurements of take-off, flight …
Behaviour problems, such as feather pecking and cannibalism, in loose housing systems for laying hens may originate from the rearing period. Early access to perches facilitates the use of three dimensional space and therefore allows escape from threatening pen mates. In this experiment, we studied individual differences in start of perching behaviour and if environmental …
Four groups of 15 – 19 adult ISA Brown hens were studied in pens to assess the relationship between social status and use of perches and nestboxes. This was to test the hypothesis that subordinate hens use these resources more by day, for avoiding dominants, but that dominants use perches more at night, for roosting. …
The spatial distribution and behaviour of perchery housed laying hens were compared at a constant stocking density (18.5 birds/m²) in eight pens with colonies of five diferent sizes (323 birds (N = 1), 374 birds (N = 2), 431 birds (N = 2), 572 birds (N = 1) and 912 birds (N = 2)). The …
Free-range systems improve the welfare of laying hens. However, hen runs are often used only close to the poultry house and only a small proportion of hens are outside. Several studies indicate that structuring elements in the hen run improve the frequency and distribution of hens in the run. In our experiments we studied the …