Collectively, individual adjustments to environmental and economic change can have disproportionate influence on the sustainability of the broader social-environmental system in which exposure takes place. Here we focus on the specific mechanisms by which farm-level responses to globalization and environmental change feedback to affect the sustainability and resilience of the socialenvironment system. We use a proposal by Lambin as an analytical frame for understanding this feedback, illustrating how information, motivation and capacity collectively structure the ways in which the actions of individuals can transform regional economies and landscapes. We draw on two Latin American case studies to illustrate the collective and synergistic implications of farmers' livelihood and land use choices for the sensitivity of the region to future market and environmental shocks, as well as for the role of the landscapes in the global carbon cycle. We argue that the potential disconnect between individual goals of livelihood security and broader aims of system sustainability can be bridged through improved governance and attention to the role of policy, individual and collective experience, and resource constraints in adaptive choice.

A vaccine against bovine mastitis was developed. The vaccine was based on inactivated, highly encapsulated Staphylococcus aureus cells; a crude extract of Staph. aureus exopolysaccharides; and inactivated unencapsulated Staph. aureus and Streptococcus spp. cells. In this study, the vaccine was evaluated in 164 cows from two commercial dairies (A and B) during a 4-mo period. Two doses of the vaccine were administered subcutaneously to 82 cows in the brachiocephalicus muscle of the neck within a 4-wk interval. The results of this trial revealed significantly fewer intramammary infections caused by Staph. aureus at various levels of severity (clinical, subclinical, and latent) in cows that were vaccinated. The odds ratios of all types of intrammammary infections caused by Staph. aureus for dairies A and B, which were determined by a logistic model, were 1.84 and 1.89, respectively, for quarters of vaccinated cows and quarters of control cows. The colony counts for Staph. aureus in milk from infected quarters of vaccinated cows were significantly lower than those in milk from infected quarters of control cows. Also, the somatic cell counts per milliliter in milk from vaccinated cows were significantly decreased when the initial somatic cell count was < 500,000 cells/ml at the start of the trial. The vaccine had no observable effect on fat production in milk or on streptococcal infections.

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