Zobrazeno 1 - 10
of 75
pro vyhledávání: '"G. C. Perry"'
Autor:
H. H. Kristensen, Jan Ladewig, Christopher M. Wathes, G. C. Perry, Katja C. Overvad, Annette Kjær Ersbøll, N. B. Prescott
Publikováno v:
Applied Animal Behaviour Science. 103:75-89
Most broiler chickens are reared commercially in artificial light environments, which differ sharply from the natural light environment in which they evolved. It is not known how light affects the behaviour of broiler chickens, despite much research
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e8d965d0807f410794da87a32fa5497
https://doi.org/10.1016/j.applanim.2006.04.017
https://doi.org/10.1016/j.applanim.2006.04.017
Autor:
G. C. Perry, Nina R Taylor, Christopher M. Wathes, Martin Potter, N. B. Prescott, Caroline Le Sueur
Publikováno v:
Applied Animal Behaviour Science. 96:19-31
This experiment investigated the preference of juvenile pigs for illuminance, and indirectly photoperiod, at two ages. The animals were equally familiar with all illuminances prior to testing. Fourgroups, each offour pigs, occupied a four-compartment
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d473de889f06f4720cbed243e1c6c841
https://doi.org/10.1016/j.applanim.2005.04.016
https://doi.org/10.1016/j.applanim.2005.04.016
Publikováno v:
The Journal of Agricultural Science. 140:373-379
An experiment was designed to test the response of growing pullets to two changes in photoperiod (an increase from 8 to 14 h followed 5 weeks later by the reverse change, or a decrease from 14 to 8 h followed by an increase). The first change was mad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7e10f149ac691ab24a3b9bff1885a57
https://doi.org/10.1017/s0021859603003137
https://doi.org/10.1017/s0021859603003137
Publikováno v:
The Journal of Agricultural Science. 138:441-458
A model is presented which will predict mean age at first egg (AFE) for pullets of laying strains reared under non-limiting environmental conditions but exposed to a single change in photoperiod during the rearing stage. An initial analysis of 12 pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ff59108711561429287c7411cdf2cddc
https://doi.org/10.1017/s0021859602002162
https://doi.org/10.1017/s0021859602002162
Publikováno v:
British Poultry Science. 42:530-535
1. Groups of ISA Brown pullets were transferred from 8- to 16-h photoperiods at 34, 44 or 54 d. In each group, 12 birds were injected on alternate days over a 12-d period starting 6 d before the change in photoperiod with beta-oestradiol-3-benzoate (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b084561227a6a91d1264ad00ffd07099
https://doi.org/10.1080/00071660120070596
https://doi.org/10.1080/00071660120070596
Publikováno v:
Animal Welfare. 10:131-139
It has been shown that, in small groups of intact male domestic turkeys, supplementary ultraviolet (UV-A) radiation, visual barriers, and added straw (environmental enrichment) minimize the incidence of injurious pecking under incandescent light at 5
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e562c8f3e7226449a48df79f2958d532
https://doi.org/10.1017/s0962728600023800
https://doi.org/10.1017/s0962728600023800
Autor:
G. C. Perry
Publikováno v:
BSAP Occasional Publication. 28:119-124
Current commercial poultry production in the UK faces many challenges which make it difficult to confidently predict the future. Changing legislation, responding largely to welfare pressures, is one such challenge. Additionally, consumer demands are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6ba531f1578ec91653ccd21c818005a
https://doi.org/10.1017/s1463981500041078
https://doi.org/10.1017/s1463981500041078
Publikováno v:
Poultry Science. 79:850-855
Ultraviolet (UV) sensitivity in birds has been shown to be intrinsically involved in the selection of mates; UV may, therefore, also play a role in the establishment and maintenance of social hierarchies in intensively housed turkeys. Cereal seeds an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bebb3525df4051f31e02e987ebc5397
https://doi.org/10.1093/ps/79.6.850
https://doi.org/10.1093/ps/79.6.850
Publikováno v:
British Poultry Science. 41:131-135
1. Responses to ultraviolet (UV) radiation were studied in two trials. In one trial, sexually mature pullets, that had been maintained on an 8L:16D regimen from 2 d of age, were exposed sequentially, for periods of 9 to 12 d, to a further 8 h of very
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16c74be8830116e51be67f39df7e13a4
https://doi.org/10.1080/713654916
https://doi.org/10.1080/713654916
Publikováno v:
Poultry Science. 78:1227-1231
Layer strain pullets were reared on litter and given an 8-h photoperiod to 10 wk of age. They were then transferred to cages in which light intensity at the feed trough varied from 5 to 14 lx. Thirty birds continued on 8 h light (L):16 h dark (D) (ne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fde3be016a7bb2770b3621feb7c10487
https://doi.org/10.1093/ps/78.8.1227
https://doi.org/10.1093/ps/78.8.1227