Dietary conjugated linoleic acid improves carcass leanness without altering meat quality in the growing pig

One constraint facing the pig industry is that <i>ad libitumi> feeding can often result in high levels of body fat and technologies which can reduce the ratio of lean to fat deposition in the pig are continually being explored. Conjugated linoleic acids have been shown to decrease body fat content in pigs. Therefore, the aim of this study was to determine whether dietary conjugated linoleic acids supplementation has any effect on meat quality and carcass characteristics in finisher pigs. Sixty female crossbred (Large White &times; Landrace) pigs (average initial weight 56.6 ± 1.9 kg and average initial P2 backfat 11.4 ± 1.3 mm) were used in the present study. Pigs were individually housed and randomly allocated to 1 of 6 dietary treatments: 0, 0.125, 0.25, 0.50, 0.75 or 1.0% (w/w) of conjugated linoleic acids-55. The wheat-based diets were formulated to contain 14.3 MJ DE and 9.3 g available lysine per kg and were fed <i>ad libitumi> for 8 weeks. Pigs were slaughtered and meat quality was determined on the <i>longissimus thoracisi> using standard techniques. Dietary conjugated linoleic acids reduced subcutaneous back fat in a linear manner with effects being most pronounced in the middle back fat layer. There was also a linear (<i>Pi><0.001) decrease in intramuscular fat with increasing dietary conjugated linoleic acids supplementation. However, there was no effect of conjugated linoleic acids on subjective measures of marbling of the loin. Also, loin muscle ultimate pH (<i>P i>= 0.94), lightness values (<i>Pi> = 0.46) subjective colour scores (<i>Pi> = 0.79), cooking loss (<i>Pi> = 0.71), drip loss (<i>Pi> = 0.40), shear force (<i>Pi> = 0.61) and subjective measures of wetness/firmness (P = 0.19) were unaffected. Dietary conjugated linoleic acids did not alter oxidation, as measured by the level of TBARs at day 1 post-slaughter (<i>Pi> = 0.38) or after 9 days of simulated retail display (<i>Pi> = 0.35). These data confirm that dietary conjugated linoleic acids can improve carcass quality by decreasing back fat depths without having any detrimental effects on meat quality.

Powerline corridors: degraded ecosystems or wildlife havens?

Management of powerline corridors in Australia has traditionally focused on the complete removal of vegetation using short rotation times owing to the perceived hazard of fire associated with corridor vegetation. Because of the intense management associated with fire hazards, little thought has been given to use of powerline corridors by wildlife. This has resulted in corridors traditionally being viewed as a source of fragmentation and habitat loss within forested ecosystems. We investigated the responses of small mammal communities living in a powerline corridor to management-induced vegetation changes at different successional stages, to determine whether a compromise could be reached between managing corridors for fire and biodiversity. Habitat modelling in the corridor and adjacent forest for three native and one introduced small mammal species demonstrated that species responded to changes in vegetation structural complexity, rather than time-since-management <i>per sei>. Early seral stages of vegetation recovery after corridor management encouraged the introduced house mouse (<i>Mus domesticusi>) into corridors and contributed little to biodiversity. Mid-seral-stage vegetation, however, provided habitat for native species that were rare in adjacent forest habitats. As the structural complexity of the vegetation increased, the small mammal community became similar to that of the forest so that corridor vegetation contributed fewer biodiversity benefits while posing an unacceptable fire risk. If ecologically sensitive management regimes are implemented to encourage mid-seral vegetation and avoid complete vegetation removal, powerline corridors have the potential to improve biodiversity. This would maintain landscape connectivity and provide habitat for native species uncommon in the forest while still limiting fuel loads in the corridor.

An experiment using ICT to investigate pure voting power

We present an experiment to evaluate the accuracy of power indices by measuring the political power embodied in blocks of votes <i>per sei>. The experiment incorporates several players interacting in lCT chat rooms under supervision. The chat rooms and the selection process reduce or eliminate other political forces leaving logroIIing as the primary political force.

An experimental investigation of pure voting power

We evaluate the accuracy of power indices by experimentally measuring the political power embodied in blocks of votes <i>per sei>.  The experiment incorporates several players interacting in online chat rooms under supervision.  The chat rooms and the selection process reduce or eliminate extraneous political forces leaving logrolling as the primary political force.  Results show that two standard power indices reflect voting power while other power indices and proportionality do not.

Standard voting power indices work : an experimental investigation of pure voting power

We evaluate power indices by experimentally measuring the political power embodied in blocks of votes <i>per sei>. Subjects with differing votes divide a fixed purse by majority rule in online chat rooms under supermision. Chat rooms and processes for selecting subjects reduce or eliminate extraeous political forces leaving logrolling as the primary political force. Results show that various power indices bracket voting power which is more than proportionally concentrated in large players.

Fenitrothion, an organophosphate, affects running endurance but not aerobic capacity in fat-tailed dunnarts (Sminthopsis crassicaudata)

We measured aerobic metabolism during cold exposure and exercise performance (run duration and oxygen consumption while running at 1 m s^&minus;1) in the fat-tailed dunnart <i>Sminthopsis crassicaudatai>, a dasyurid marsupial, before and after ingestion of 30 mg kg^&minus;1 of fenitrothion, an organophosphate (OP) pesticide. Running endurance of OP-exposed animals was less than half that of control animals over the first 3 days after dosing and 55% of control animal endurance on day 5 post-dose. Despite these declines, peak metabolic rate at this running speed (9.3 times basal metabolic rate; BMR) was unaffected by OP exposure. Peak metabolic rate (PMR) and cumulative oxygen consumption during a 1-h exposure to conditions equivalent to &minus;20 °C did not differ between OP-treated and control dunnarts, with PMR averaging 11 times BMR. We conclude that fenitrothion-induced exercise fatigue is not due to limitations in oxygen or substrate delivery to muscle or in their uptake <i>per sei>, but more likely relates to decreased ability to sustain high-frequency neuromuscular function. The persistence of locomotor impairment following OP exposure in otherwise asymptomatic animals emphasizes the importance of using performance-based measures when characterising sublethal effects of pesticide exposure in an ecological context.

Foot complications in Type 2 diabetes : an Australian population-based study

Aims To determine the prevalence and risk factors for neuropathy and peripheral vascular disease (PVD) in the Australian diabetic population and identify those at high risk of foot ulceration.

Methods The Australian Diabetes Obesity and Lifestyle study included 11 247 adults aged ≥ 25 years in 42 randomly selected areas of Australia. Neuropathy and PVD were assessed in participants identified as having diabetes (based on self report and oral glucose tolerance test), impaired fasting glucose, impaired glucose tolerance and in a random sample with normal glucose tolerance (total n = 2436).

Results The prevalence of peripheral neuropathy was 13.1% in those with known diabetes (KDM) and 7.1% in those with newly diagnosed (NDM). The prevalence of PVD was 13.9% in KDM and 6.9% in NDM. Of those with diabetes, 19.6% were at risk of foot ulceration. Independent risk factors for peripheral neuropathy were diabetes duration (odds ratio (95% CI) 1.73 (1.33–2.28) per 10 years), height (1.42 (1.08–1.88) per 10 cm), age (2.57 (1.94–3.40) per 10 years) and uric acid (1.59 (1.21–2.09) per 0.1 mmol/l). Risk factors for PVD were diabetes duration (1.64 (1.25–2.16) per 10 years), age (2.45 (1.86–3.22) per 10 years), smoking (2.07 (1.00–4.28)), uric acid (1.03 (1.00–1.06) per 0.1 mmol/l) and urinary albumin/creatinine ratio (1.11 (1.01–1.21) per 1 mg/mmol).

Conclusions The prevalence of neuropathy and PVD was lower in this population than has been reported in other populations. This may reflect differences in sampling methods between community and hospital-based populations. Nevertheless, a substantial proportion of the diabetic population had risk factors for foot ulceration.

Music teaching is more than telling : attitudes and beliefs of Australian pre-service teachers

Pre-service teachers’ views are often confronted at tertiary level in regards to theories of teaching and learning which can through discussion and reflection change their perceptions and their understanding of classroom practice. Tertiary educators are challenged to develop positive attitudes and beliefs about education to their pre-service students if music education is to be valued in all educational settings. Drawing on educational perspectives on teaching, this article investigates the myriad of influences that shape pre-service teachers’ attitudes and beliefs about music teaching and learning. Between 2005-2009 final year music teacher education students from Deakin University and Monash University (Melbourne, Australia) participated in a research project entitled Intercultural attitudes of pre-service music education students. This article draws on the 2008 cohort interpersonal and affective attributes regarding what they thought makes a good teacher and how they would see themselves as future music teachers. Whilst the findings provide important insights into Australian pre-service teachers they also hold similar significance for teacher education in general. I contend that continued research with our students can only help us as tertiary educators to prepare our students to be effective teachers.

Current empirical assessment methods for adolescents and children who sexually abuse others

The assessment of adolescents and children who commit sexually abusive behavior is a complex and challenging task. Incorporating empirically based assessment methods into psychosexual evaluations promises appropriate coverage of relevant domains, sound interpretation of the meaning of data, reduced clinician biases and error, and greater certainty in decision-making. In this paper we review empirically-based assessment methods currently available for use in psychosexual assessment of adolescents and children who sexually abuse others. Our review describes the robustness of these measures and provides guidance for their appropriate use in assessment. The review highlighted that several empirically-based measures are suitable for clinical use with adolescents, but very little is available to guide assessment of children's abusive behavior <i>per se. i>

An exploration of the motivation to attend for spectators of the Lexmark Indy 300 champ car event, Gold Coast

The perceptions of spectators <i>(N = 36)i> at the Lexmark Indy 300 Champ Car event were assessed via qualitative methods to evaluate their internal and external motivations to attend. The most common reason to attend was the atmosphere that the event created, and entertainment. Other reasons included the race, enjoying the company of friends, and group affiliation. The characteristics of the majority of attendees were predominantly male, 26 to 35 years old, from Queensland, who earned around <i>AUDi><i>$50,000 to $75,000i> per annum. The findings of the study have implications for sport marketers who wish to communicate to these individuals.