We consider the population dynamics of two competing species sharing the same resource, which is modeled by the carrying capacity term of logistic equation. One species (farmer) increases the carrying capacity in exchange for a decreased survival rate, while the other species (exploiter) does not. As the carrying capacity is shared by both species, farmer is altruistic. The effect of continuous...

The average lifetime of sows as observed in production herds is primarily influenced by management decisions. Usually the farmer decides to cull a sow, either because he expects that a gilt's average productivity is higher than the marginal productivity of the sow, or because the current number of sows exceeds the production capacity, e.g. in the farrowing department. Several studies have shown...

For 10,000 years agriculture has been based on the strategy of conserving and enhancing genetic diversity. Humans have always this time domesticated and modified wild plants and animals, the gifts of nature’s biodiversity. According to Erna Bennett (former genetic resources expert to the Food and Agricultural Organization of the UN), ‘The patchwork of cultivation sown by man unleashed an explos...

Maize is the most productive and highest value commodity crop in the U.S. and around the world: over 1 billion tons were produced each year in 2013 and 2014 (FAO, 2016). Together, maize, rice, and wheat comprise over 60% of the world’s caloric intake (http://www.fao.org). The importance of maize in terms of production and caloric intake is not a recent development. In fact, Native Americans hav...

In ‘Comments on Theeuwes and Riemersma’s Revisit of Daytime Running Lights’ Williams and Farmer ( 1996) comment on a paper we published in Accident Analysis and Prevention. In this paper we show that the original claim by Andersson and Nilsson ( 198 1) that the nationwide implementation of Daytime Running Lights (DRL) in Sweden resulted in a reduction of multiple daytime accidents was not warra...

Agricultural extension has shifted towards community-centric, farmer-centered, and participatory approaches that enhance rural change through a social learning lens, resulting in the emergence of farmer-to-farmer model. The purpose study was to understand lead farmer selection criteria within model their impacts on community learning. We applied Torraco’s (2005) integrative literature review me...