Broiler breeders should not be reared on long photoperiods

Sexual maturity is delayed and egg numbers are reduced when broiler breeders are reared on long photoperiods. However, this is the recommended procedure for rearing spring-hatched birds in non-lightproof buildings. Research at the University of KwaZulu-Natal has suggested that this advice may be incorrect, and that precocity is not a problem in control-fed broiler breeders reared on increasing daylengths. This trial compared the responses of four broiler breeder genotypes to a typical lighting programme advocated for birds in lightproof housing with the provision of 14-h photoperiods to 20 weeks and 16 h in lay. The long-day rearing resulted in a 26-d delay in sexual maturation, seven fewer eggs to 60 weeks, a 2.5-g increase in egg weight, less efficient feed conversion, heavier body weights at sexual maturity and throughout the laying period, and a higher incidence of mortality. It is concluded, therefore, that broiler breeders should not be reared on long photoperiods, even when hatched in the spring and kept in non-lightproof facilities, because of the adverse consequences of a delay in the dissipation of photorefractoriness. Keywords: Broiler breeder; light, rearing; long days; out-of-season South African Journal of Animal Science Vol. 37 (4) 2007: pp.215-22

Abrupt or gradual increases in photoperiod for broiler breeders

Cobb 500 broiler breeder females (n = 832), which had been raised to achieve a typical 20-week body weight of 2.1 kg, were subjected to an abrupt or gradual increase in photoperiod to determine the effects on reproductive performance. One group (n = 416) was reared on 8-h photoperiods till 19 weeks and abruptly transferred to 16-h photoperiods. Another group (n = 416) was reared on 8-h photoperiods and given an initial increase to 12 h at 19 weeks, then weekly increments of 1 h to reach 16 h at 23 weeks. Both groups were reared in light-proofed facilities to 23 weeks and then moved to curtain-sided housing and maintained on 16-h daylengths to 60 weeks. There were no significant differences between the two lighting groups for age at sexual maturity, total egg production, egg mass output, mean egg weight to or body weight at 60 weeks. However, the birds given a single abrupt increment had a higher peak rate of lay whilst those given a gradual increase in daylength had better egg production at the end of the laying cycle. Broiler breeders transferred from closed rearing to curtain-sided adult accommodation (similar to that in which a large proportion of broiler breeders are housed) respond similarly to abrupt and gradual increases in daylength as do birds maintained throughout in controlled environment accommodation, and modern genotypes have similar responses to early genotypes. South African Journal of Animal Science Vol. 36(1) 2006: 45-4

Male broiler performance and nocturnal feeding under constant 8-h or 16-h photoperiods, and various increasing lighting regimens

This paper describes the responses of two genotypes of male broilers to constant 8- and 16-h photoperiods, and to an abrupt transfer from 8 to 16 h at 10, 15 or 20 d. Body weight, feed intake, and feed conversion efficiency were not significantly different at any stage during the 35 d study. Mortality and the incidence of Sudden Death Syndrome were similar for all lighting groups at 35 d. When these data were pooled with previously reported data for female broilers, growth and feed conversion efficiency post 21 d and through to depletion for constant 8-h and birds transferred from 8 to 16 h at 20 d were significantly superior to constant 16-h birds. Constant 8-h birds ate about half their feed during the dark period, whilst 16-h birds consumed no more than 10%. Birds which had been started on 8 h and transferred to 16 h at 10, 15 or 20 d reduced their rate of nocturnal feeding when changed to the longer photoperiod, however, they still consumed more feed in the 8-h dark period than birds that had always been given 16 h illumination. Cobb and Ross genotypes responded similarly to all lighting treatments. Keywords: Photoperiod, broiler growth, nocturnal feedingSouth African Journal of Animal Science Vol. 38 (3) 2008: pp. 159-16

Supplementary radio noise advances sexual maturity in domestic pullets exposed to 7-h photoperiods

Cage-reared, egg-type domestic pullets were given a 7L:17D regimen from 2 d of age. At eight weeks, 24 birds were transferred to individual cages in each of four controlled environment chambers and maintained on 7-h photoperiods. A radio was played at 75-80 dB from 10 weeks of age in two of the chambers during the 7 h immediately preceding the photoperiod, and the other two chambers remained as controls. Mean age at first egg for the radio birds (143 d) was 13 d significantly earlier than controls, but body weight at first egg was similar for the two groups. Although this suggests that the radio noise might have stimulated feeding activity and accelerated growth, there was no significant difference between the groups for a regression of body weight on age at first egg, indicating that accelerated growth did not contribute to the advance in maturity. A shift in the location of the photoinducible phase, so that it became partially illuminated by the normally non-stimulatory 7-h photoperiod, is another possible reason for the earlier sexual development. Plasma melatonin concentrations midway through the 7-h dark period in which the radio was played were similar to those of non-radio controls, indicating that this period was not regarded as being part of a 14-h subjective day. Keywords: Environmental cue; sound; sexual maturity South African Journal of Animal Sciences Vol. 35 (3) 2005: pp.180-18

Social Media, Peer Surveillance, Spiritual Formation, and Mission: Practising Christian Faith in a Surveilled Public Space

Social media has become a part of everyday life, including the faith lives of many. It is a space that assumes an observing gaze. Engaging with Foucauldian notions of surveillance, self-regulation, and normalisation, this paper considers what it is about social and digital culture that shapes expectations of what users can or want to do in online spaces. Drawing upon a wide range of surveillance research, it reflects upon what “surveillance” looks like within social media, especially when users understand themselves to be observed in the space. Recognising moral panics around technological development, the paper considers the development of social norms and questions how self-regulation by users presents itself within a global population. Focusing upon the spiritual formation of Christian users (disciples) in an online environment as a case study of a community of practice, the paper draws particularly upon the author’s experiences online since 1997 and material from The Big Bible Project (CODEC 2010–2015). The research demonstrates how the lived experience of the individual establishes the interconnectedness of the online and offline environments. The surveillant affordances and context collapse are liberating for some users but restricting for others in both their faith formation and the subsequent imperative to mission

Comment Piece: Youth, social media and the Election #GE2015

Dr Bex Lewis examines the role played by social media in the election and considers its influence on younger voters

The Planning, Design and Reception of British Home Front Propaganda Posters of the Second World War

This project focuses on propaganda posters produced during the Second World War (1939 to 1945), primarily by the British government, aimed chiefly at their civilian population. The project uses Foucauldian discourse analysis and content analysis to investigate the images and their context, and identify key themes across a wide range of posters, over a long time-frame. This thesis contributes to an historical understanding of the British popular propaganda experience, largely ignored in previous historical research. Drawing on material from several archives, including the Imperial War Museum (IWM), the Public Record Office (PRO) and Mass-Observation (M-O), the project also uses questionnaires to elicit memories of the posters, and a poster database to collect together material which would otherwise remain dispersed. The thesis sets the posters against a background of contextual material, it identifies key propaganda theories, discerns relevant poster styles and recognises British poster style as one of pragmatic functionalism. The thesis outlines the poster production and distribution processes of the Ministry of Information (MOI) and considers the first (highly criticised) posters before concentrating on four case studies, each of which is structured in three sections: the planning (context), the design, and the reception of the posters. The first case study examines what people were fighting for, and identifies their ‘imagined community’, by considering urban and rural representations of the UK in the posters. The second case study considers industrial propaganda, emphasises the idea of the island nation, and identifies those involved in the industrial effort. The third case study looks at the ‘enemy within’, and examines who was excluded from, or was considered damaging to, the war effort. The fourth case study explores in detail who was compromising the war effort through their sexual behaviour, putting themselves at risk of venereal disease. The thesis argues that the posters drew heavily on longer term discourses emanating from new and established institutions, although there was often a clear distinction between those that drew on the past and tradition, and those that pushed forward to the future

Simulated natural lighting and constant 14-hour photoperiods for broiler breeders during the rearing period, and interactions of lighting with body weight

No Abstract. South African Journal of Animal Science Vol. 35 (1) 2005: pp.1-1

Economic evidence for the prevention and treatment of atopic eczema: a protocol for a systematic review

Background: Eczema, synonymous with atopic eczema or atopic dermatitis, is a chronic skin disease that has a similar impact on health-related quality of life as other chronic diseases. The proposed research aims to provide a comprehensive systematic assessment of the economic evidence base available to inform economic modelling and decision making on interventions to prevent and treat eczema at any stage of the life course. Whilst the Global Resource of Eczema Trials (GREAT) database collects together the effectiveness evidence for eczema there is currently no such systematic resource on the economics of eczema. It is important to gain an overview of the current state of the art of economic methods in the field of eczema in order to strengthen the economic evidence base further. Methods/design: The proposed study is a systematic review of the economic evidence surrounding interventions for the prevention and treatment of eczema. Relevant search terms will be used to search MEDLINE, EMBASE, Database of Abstracts of Reviews of Effects, Cochrane Database of Systematic Reviews, Cochrane Central Register of Controlled Trials, NHS Economic Evaluation Database, Health Technology Assessment, Cumulative Index to Nursing and Allied Health Literature, Econ Lit, Scopus, Cost-Effectiveness Analysis Registry and Web of Science in order to identify relevant evidence. To be eligible for inclusion studies will be primary empirical studies evaluating the cost, utility or full economic evaluation of interventions for preventing or treating eczema. Two reviewers will independently assess studies for eligibility and perform data abstraction. Evidence tables will be produced presenting details of study characteristics, costing methods, outcome methods and quality assessment. The methodological quality of studies will be assessed using accepted checklists. Discussion: The systematic review is being undertaken to identify the type of economic evidence available, summarise the results of the available economic evidence and critically appraise the quality of economic evidence currently available to inform future economic modelling and resource allocation decisions about interventions to prevent or treat eczema. We aim to use the review to offer guidance about how to gather economic evidence in studies of eczema and/or what further research is necessary in order to inform this