Non-viable sperm ("dead sperm") are present invariable numbers in mammalian ejaculates and their number increase substantially when semen is stored, particularly cryopreserved. This review comparatively highlights, with experimental data in porcine, the role-played by non-viable sperm in the outcome of semen used in assisted reproductive technologies. As well, the review discusses our current understanding of their origin and the pathways involved when their large numbers negative influence the functional lifespan of contemporary viable sperm to eventually cause irreversible dysfunction that reduces their fertility potential and their ability to develop healthy embryos. Finally, it highlights procedures currently available to mitigate these harmful effects. (C) 2016 Elsevier B.V. All rights reserved. ; Funding Agencies|European Regional Development Fund; Spanish Government (MINECO-FEDER) [AGL2012-39903, MINECO AGL2015-69738-R]; Seneca Foundation of Murcia [19892/GERM/15]; Swedish Research Council VR, Stockholm, Sweden [2011-6353]; Swedish Research Council FORMAS, Stockholm, Sweden [2011-512]; Swedish Research Council FORSS, Stockholm, Sweden [312971]
Small ruminants support the livelihoods of millions of poor pastoralist and sedentary households around the world. While pastoralists are generally not amongst the poorest in terms of assets, they are frequently marginalised in terms of their access to political power, health and education. This study was undertaken among pastoralist households keeping small ruminants in four regions of the country of Georgia. Small ruminants are an important cultural, social and economic asset in Georgia and are mainly managed in a transhumant pastoralist system. Georgia suffered its first, and so far only outbreak of peste des petits ruminants (PPR) in 2016. This qualitative interview study was designed to acquire contextual understanding of local small ruminant husbandry and the livelihood situations of the participating pastoralists, and to detect historical, unreported PPR outbreaks. Focus group discussions comprising participatory epidemiology tools and other forms of interviews were used to explore small ruminant management, disease spectrum and management, and animal health priorities. The participants had experienced a wide variety of animal health constraints, with intestinal worms, braxy, piroplasmosis, pasture-related problems, predators and lameness emerging as priorities. No historic, unreported PPR outbreak was detected in this study, and PPR was not a priority for participants. Instead, the day-to-day reality of animal health for the pastoralists was characterised by co-infections of mainly endemic pathogens, and problems related to other challenges such as access to land, feed and genetic resources. The rationale behind the participants' prioritisation of animal health problems was supported by the need to pay extra attention to animals in order to avoid risk factors, keep animals healthy and minimise the negative impact of diseases or management problems; the various epidemiological and clinical parameters of the prioritised diseases; the economic impact of the specific problems and the zoonotic potential of diseases and predation. Even within regions, and within seemingly socially and culturally homogenous groups, there were important local differences in the problems faced by pastoralists that affect their livestock management. This study underlines the importance of a contextualised understanding of the local disease panorama and complexities in the livelihood situations of rural people when designing actions to improve animal health in general or, more specifically, passive surveillance as well as prevention or control measures. Finally, it is concluded that to achieve such an understanding, there is a need for participatory, scoping-style studies that specifically acknowledge diversity and power relations.
Antibacterial resistance (ABR), is a growing global threat to human and animal health. Efforts to contain ABR are urgently needed. This qualitative interview study explored perceptions of work to contain ABR among stakeholders in food animal production in Sweden, with focus on broiler production. Semi-structured interviews were carried out with a strategic sample of 13 stakeholders in different parts of production, from professionals at policy level, veterinary authorities, to poultry farmers and poultry veterinarians. Conventional inductive content analysis was used for data analysis. A latent theme, "Working in unison," emerged, based on the consistency expressed by the informants when they discussed ABR, use of antibiotics, and animal health management. This theme was built on four domains representing the content of the interviews: Knowledge and engagement; Cooperation; Animal health concept; and Development in balance with economic prerequisites. According to the informants, ABR has not been an isolated issue in Sweden but has been included in a tradition of animal health and welfare, and actions have been driven by the industry or by government regulations. Veterinarians described how they worked closely with farmers. Farmers felt involved in the development of animal health management methods. The One Health concept was well-known among stakeholders at national level but not at farm level. Close cooperation between stakeholders seems to facilitate development of animal production with low use of antibiotics.
