Received: Revised: Accepted: December 31, 2012 June 19, 2013 August 07, 2013 In the present study, effects of stress-free and stressful seasons on certain physical and biochemical attributes of semen of Cholistani AI bulls were investigated. A total of 382 ejaculates from six bulls were collected at weekly intervals during four seasons viz. stress-free autumn (October-November), stressful winte...

White sturgeon (Acipenser transmontanus) are the largest freshwater fish in North America and a species exposed to widespread fishing pressure. Despite the growing interest in recreational fishing for white sturgeon, little is known about the sublethal and lethal impacts of angling on released sturgeon. In summer (July 2014, mean water temperature 15.3°C) and winter (February 2015, mean water t...

Summer dormancy is an evolutionary response that some perennial cool-season grasses adopted as an avoidance strategy to escape summer drought and heat. It is correlated with superior survival after severe summer droughts in many perennial grass species originating from Mediterranean environments. Understanding the genetic mechanism and environmental determinants of summer dormancy is important ...

heat stress and exhaustion is one of the top causes of chicken death. for those new to backyard chicken farming, it is important you learn to recognize the signs of this serious condition and how to keep your chickens cool and hydrated. chicks, especially, need extra attention to help them remain healthy. for a flock of laying hens, knowing how to prevent heat exhaustion and treat a chicken suf...

While the responses of photosynthesis to water stress have been widely studied, acclimation to sustained water stress and recovery after re-watering is poorly understood. In particular, the factors limiting photosynthesis under these conditions, and their possible interactions with other environmental conditions, are unknown. To assess these issues, changes of photosynthetic CO(2) assimilation ...

To assess the effect of agriculture drain water, a complex mixture containing pesticides and selenium (Se), on the physiological stress response, white suckers were collected from irrigation return flows in the summer and the fall and subjected to a stress challenge. Water (0.40-26.71microg/L) and muscle Se (0.37-1.52microg/g ww) levels were elevated at two sites and plasma acetylcholinesterase...

Indices of the North Atlantic Oscillation (NAO) have been very useful for explaining interannual variability in many ecological time series. We suggest that this is based on a combination of 3 factors: (1) the strong relationship between NAO and meteorological conditions in winter; (2) qualitative changes in environmental conditions in response to winter conditions, especially temperatures; and...