the influence of parasitoids on population dynamics is affected by host instar preference. the preference pattern of host instars is not fixed and is modified by the availability and relative abundance of host instars, intensity of defensive behaviors in a particular instar, and also maternal effects of the female forager. in this study, host instar preference of the thelytokous strain of lysip...

A study was conducted with aim of determining toxicity effects Piper guineense and chlorpyrifos powders on adult mortality Callosobruchus subinnotatus, progeny emergence (F1), damage weight loss, germination Bambara nuts. Study carried out at Botany laboratory, Gombe State University, State, Nigeria. P. were mixed 0.0g 0.8g concentration 20g nuts inside 1000ml plastic containers. Experiment in ...

The aim of this study was to extend optimum contribution selection to more realistic breeding schemes with multistage selection. It seems that if the last selection stage accounts for the relationship of the selected animals, then previous selection stages also account for this relationship. An extreme example was considered here: the preselection of dairy bulls that enter a progeny testing sch...

This publication presents the assessment of the impact of genetically modified (GM) LibertyLink® maize on reproductive function, prenatal and postnatal progeny development of Wistar rats over three generations. The animals were divided into two groups, which were fed with rodent diet with inclusion of GM LibertyLink® ('test' group) and non-GM near-isogenic counterpart ('control' group) maize va...

7 The year 2001 was one of change for the cooperative in many important ways. Industry consolidation and the shifts in land ownership patterns continued to accelerate. International Paper Company's acquisition of Champion International , which was actually completed in 2000, resulted in a loss of a cooperative member in 2001. Fortunately, this occurred without a corresponding loss of breeding m...

A recent study conducted a factor analysis on 18 behavioural measures obtained from four alcohol-preferring and five alcohol-non-preferring rat lines/strains. It was concluded that variables such as saccharin intake, ultrasonic vocalizations following an air puff, and defaecation in an open field were associated with voluntary and forced alcohol consumption. In contrast, measures such as time i...