ORCID Profile
0000-0003-0113-6324
Current Organisations
Commonwealth Scientific and Industrial Research Organisation
,
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas
,
University of New England
,
CSIRO
,
Chattogram Veterinary and Animal Sciences University
,
Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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Publications
Effects of outdoor ranging on external and internal health parameters for hens from different rearing enrichments
Publisher: PeerJ
Date: 06-03-2020
DOI: 10.7717/PEERJ.8720
Abstract: In Australia, free-range layer pullets are typically reared indoors, but adult layers go outdoors, and this mismatch might reduce adaptation in laying environments. Enrichments during rearing may optimise pullet development and subsequent welfare as adult free-range hens. In the outdoor environment, hens may have greater opportunities for exercise and natural behaviours which might contribute to improved health and welfare. However, the outdoor environment may also result in potential exposure to parasites and pathogens. In idual variation in range use may thus dictate in idual health and welfare. This study was conducted to evaluate whether adult hens varied in their external and internal health due to rearing enrichments and following variation in range use. A total of 1386 Hy-Line Brown ® chicks were reared indoors across 16 weeks with three enrichment treatments including a control group with standard housing conditions, a novelty group providing novel objects that changed weekly, and a structural group with custom-designed structures to increase spatial navigation and perching. At 16 weeks of age the pullets were moved to a free-range system and housed in nine identical pens within their rearing treatments. All hens were leg-banded with microchips and daily ranging was assessed from 25 to 64 weeks via radio-frequency identification technology. At 64–65 weeks of age, 307 hens were selected based on their range use patterns across 54 days up to 64 weeks: indoor (no ranging), low outdoor (1.4 h or less daily), and high outdoor (5.2–9 h daily). The external and internal health and welfare parameters were evaluated via external assessment of body weight, plumage, toenails, pecking wounds, illness, and post-mortem assessment of internal organs and keel bones including whole-body CT scanning for body composition. The control hens had the lowest feather coverage ( p 0.0001) and a higher number of comb wounds ( P = 0.03) than the novelty hens. The high outdoor rangers had fewer comb wounds than the indoor hens ( P = 0.04), the shortest toenails ( p 0.0001) and the most feather coverage ( p 0.0001), but lower body weight ( p 0.0001) than the indoor hens. High outdoor ranging decreased both body fat and muscle (both p 0.0001). The novelty group had lower spleen weights than the control hens ( P = 0.01) but neither group differed from the structural hens. The high outdoor hens showed the highest spleen ( P = 0.01) and empty gizzard weights ( P = 0.04). Both the rearing enrichments and ranging had no effect on keel bone damage (all P ≥ 0.19). There were no significant interactions between rearing treatments and ranging patterns for any of the health and welfare parameters measured in this study ( P ≥ 0.07). Overall, rearing enrichments had some effects on hen health and welfare at the later stages of the production cycle but subsequent range use patterns had the greatest impact.
Antibiotic residues in milk and eggs of commercial and local farms at Chittagong, Bangladesh
Publisher: Veterinary World
Date: 04-2015
A cross sectional study of Infectious Bursal Disease and Newcastle Disease in poultry in Narsingdi district of Bangladesh
Publisher: ScopeMed
Date: 2016
Prevalence of Antibiotic Residues and Associated Risk Factors in Milk in Chittagong, Bangladesh
Publisher: ResearchersLinks Ltd
Date: 2020
Haemato-biochemical profiles of indigenous goats (Capra hircus) at Chittagong, Bangladesh
Publisher: Veterinary World
Date: 27-08-2013
Early rearing enrichments influenced nest use and egg quality in free-range laying hens
Publisher: Elsevier BV
Date: 2020
Relationship between Range Use and Fearfulness in Free-Range Hens from Different Rearing Enrichments
Publisher: MDPI AG
Date: 25-01-2021
DOI: 10.3390/ANI11020300
Abstract: Inconsistency between the environments of indoor pullet rearing and adult outdoor housing may increase the fearfulness in free-range hens. Rearing enrichments and/or range use may reduce adult fearfulness. Hy-Line Brown® chicks (n = 1700) were reared inside across 16 weeks with three enrichment treatments: weekly changing novel objects, custom-designed perching/navigation structures, or no additional enrichments. Pullets were transferred to a free-range system at 16 weeks of age, with range access provided from 25 weeks. At 62 weeks, 135 hens were selected from the three rearing treatments and two ranging groups (indoor: no ranging and outdoor: daily ranging) based on in idual radio-frequency identification tracking. In idual behavioural tests of tonic immobility, emergence, open field, and novel object (pen level) were carried out on hens. Spectrograms of vocalisations were analysed for the open field test, as well as computer vision tracking of hen locomotion. The results showed few effects of rearing treatments, with outdoor rangers less fearful than indoor hens. The latency to step in the open field test negatively correlated with hen feather coverage. These results show that in idual variation in ranging behaviours is present even following rearing enrichment treatments, and subsequent range use might be an indicator of bird fearfulness.
Subclinical mastitis in dairy cows in south-Asian countries: a review of risk factors and etiology to prioritize control measures
Publisher: Springer Science and Business Media LLC
Date: 14-06-2022
DOI: 10.1007/S11259-022-09948-X
Abstract: Mastitis is a major production disease, causing significant economic losses for dairy farmers in South-Asian countries, as well as other parts of the world. Udder health control programs (UHCP) have been established in developed countries as an effective strategy for mastitis control but have not yet been introduced in South-Asian low-income countries like Bangladesh, India, Pakistan, and Sri Lanka. To launch UHCP successfully in dairy herds in South-Asia, it is important to know the current prevalence and risk factors for subclinical mastitis (SCM). Therefore, a narrative literature review was conducted with the aim to describe the dairy sector, the prevalence of SCM and its causal agents, risk factors for mastitis occurrence and the control measures suggested by different studies conducted in the selected countries. The literature revealed that India had the highest cattle population. Milking was mainly done by hand in all of the studied countries. Stall feeding was done in Bangladesh and Sri Lanka and limited access to grazing was also reported in some farms in India and Pakistan. There was substantial variation in the prevalence of SCM between studies in all 4 countries, ranging from about 20% to about 80%, but the average prevalence across all studies was high (50%). The most common causal agents for SCM were non-aureus staphylococci (NAS), Staphylococcus (S.) aureus, Streptococcus spp. and Escherichia (E.) coli. The management related risk factors reported for SCM were stall feeding of cows, a higher stock density, cracked floors, open drains, the presence of flies, poor drainage, peri-parturient diseases, infrequent dung removal and earth floors. The control measures suggested in these studies were to improve the hygiene and sanitation of cows, to improve the cleanliness of farms and milker's hands, to apply dry cow therapy, supplementing micronutrients and routine screening for SCM combined with taking intervention measures like isolation of cows or milking infected cows last, and proper treatment. Also, full hand milking, complete milking, machine milking, and providing feed and water immediately after milking have been recommended. Finally, we show that current literature often studies the same set of (non-manageable) risk factors, so more research is needed to obtain a comprehensive picture of the determinants of SCM. Randomized controlled trials are needed to truly quantify the effect of intervention under field conditions. Altogether, our work gives an overview of the udder health situation in South-Asia and provides the basis for the design of UHCP in this region.
Free-range egg production: its implications for hen welfare
Publisher: CSIRO Publishing
Date: 21-07-2021
DOI: 10.1071/AN19576
Abstract: Free-range laying hen housing systems are prevalent in Australia and perceived by consumers to provide greater opportunities for the expression of natural behaviour resulting in higher hen welfare. However, all housing systems have both benefits and risks and scientific evidence is needed on the welfare outcomes of free-range systems. In this review, the scientific literature is summarised from the past 10 years, from research conducted within Australia or internationally with brown laying-hen strains kept in free-range systems. It compiles information on range use by laying hens, hen behaviour while on the range, factors that affect range use, and impacts of ranging on hen health and other aspects of welfare. Novel insights have come from the use of radio-frequency identification systems that allow tracking of in idual hens and have shown that the majority of hens access the range with multiple visits across the day, but a small proportion of hens within most flocks choose to remain indoors. Hens also vary in which areas of the range they use, and provision of natural or man-made shelters can increase both range access and range distribution. Hens spend most of their time foraging while outdoors, but the types and frequencies of behaviours vary depending on the resources available and other factors. Range access can be linked to health benefits such as improved plumage condition and reduced footpad dermatitis but there are also health risks associated with free-range systems such as greater susceptibility to disease (e.g. spotty liver disease), heat stress, predation, and potentially parasites in comparison to loose or cage housing systems. Design of the range area, indoor shed, management practices and rearing environments can all influence how hens utilise free-range housing systems. Further research is crucially needed on the impact of ranging on hen welfare in variable Australian climatic conditions, encompassing intense heat and sunlight as well as cooler or wet environments.
Relationships between rearing enrichments, range use, and an environmental stressor for free-range laying hen welfare
Publisher: Frontiers Media SA
Date: 14-08-2020
Hemato-biochemical parameters of Pesti-des Petits Ruminants (PPR) affected goats in Chittagong, Bangladesh
Publisher: ScopeMed
Date: 2018
Epidemiology of livestock and poultry diseases in Jhenaidah district of Bangladesh
Publisher: ResearchersLinks Ltd
Date: 2020
Prevalence and multidrug-resistant pattern of Salmonella from the eggs and egg-storing trays of retail markets of Bangladesh
Publisher: Veterinary World
Date: 2016
Related Organisations
Commonwealth Scientific And Industrial Research Organisation
Location: Australia
University College London
Location: United Kingdom of Great Britain and Northern Ireland
Centro De Investigaciones Energéticas Medioambientales Y Tecnológicas
Location: Spain
Commonwealth Scientific And Industrial Research Organisation
Location: No location found
Chattogram Veterinary And Animal Sciences University
Location: Bangladesh
Commonwealth Scientific And Industrial Research Organisation (CSIRO)
Location: Australia
Related Funding Activities
SFERA III: Solar Facilities For The European Research Area - Third Phase
Start Date: 2019
End Date: 2025
Funder: European Commission
View Funded Activity