Page 10 - National Poultry Newspaper

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Figure 2: Hen range use on sunny days during the in Tasmania.
day on a commercial farm
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Page 10 – National Poultry Newspaper, July 2022
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Figure 1: Three types of sunlight filtering shelters set up on a commercial farm in Queensland – 1. 90 percent UV-filtering cloth shelter, 2. 70 percent UV-filtering cloth shelter and 3. 50 percent UV-filtering cloth shelter.
High UV radiation and hot temperatures affect hens’ range use in summer
THE consumer demand for free range eggs and perceived improved hen welfare when outdoor access is available is in- creasing worldwide, in- cluding in Australia.
However, it is unknown which aspect of sunlight has the most impact on range use.
with ambient temperature and humidity, a study – Exp-1 – was carried out on three different commercial free range layer farms with diverse Australian climat- ic conditions in Tasmania, Queensland and Western Australia during the sum- mer autumn period De- cember to May.
the associated range area was selected for this study. The distribution of hens within the range was vid- eo recorded during the day throughout the entire
However, hens have a choice in accessing the outdoor range which could depend on numerous fac- tors, including weather conditions and sunlight intensity.
Additionally, enriching the outdoor range with ar- tificial covers can protect the hens from direct sun- light, but degree of protec- tion may influence shelter use.
study period.
Later, the number of
Geographically, the posi- tion of Australia results in high levels of ultraviolet radiation with high-inten- sity sunlight across the country during summer, and this can affect hens’ outdoor range use.
So, how do hens respond to different spectra of sun- light during the summer when it becomes most in- tense, and do hens prefer shelters with higher sun protection?
A further study – Exp-2 – undertaken on a com- mercial farm in Queens- land, provided outdoor cloth shelters with differ- ent sunlight filtering per- centages to determine if hens showed preferences for different shelter types during the summer – see Figure 1.
Exp-1
hens was counted within the sampled area sepa- rately during sunny and cloudy conditions, using image snapshots taken at 30-minute intervals from the time of pop-hole open- ing until sunset.
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Figure 3: Hen range use on cloudy days during the
in Queensland.
day on a commercial farm
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Recent research ad- dressed these questions across two consecutive studies.
When it was sunny, hens were counted in range ar- eas under direct sunlight – ‘sun’ – and in the shaded areas of range shelters or the shed – ‘sun-shade’.
To determine the rela- tionship between hen range use and different sunlight spectrums along
A single shed compris- ing 20-30,000 laying hens from each farm and part of
When it was cloudy, the exact parts of the range area under the direct
* continued P11