A trade-off between fecundity and life expectancy is fundamental to most theories on the evolution of life histories and ageing. In fact, sexual reproduction has been shown to reduce lifespan in a large number of species across all biological taxa [1]. The only exception known thus far are eusocial hymenopterans, with reproducing queens usually living much longer than the sterile workers [2]. H...

Throughout the history of development dairy cattle breeding, particular importance has always been attached to identification and rational use record cows. The significance this category breeding is determined not only by individual indicators, but also effect they have on improvement breed herds, primarily through their sons and, a certain extent, as ancestors families. It should be noted that...

The objective of this cooperative research project is to quantify Listeria monocytogenes in ready-to-eat (RTE) uncured and cured poultry, pork and beef products that have been pre-sliced by the manufacturer or sliced upon demand in supermarket delis. This data will expand on a previous study sponsored by the Food Products Association (formerly National Food Processors Association; Gombas et al....

Two-hundred pigeon breeders attending a national convention were studied for a possible correlation between the hobby of raising pigeons and the incidence of respiratory or immunologic abnormalities. Information concerning his exposwe to pigeons, respiratory symptoms and smoking habits was obtained from each breeder. Chest x-ray examinations and pulmonary function tests were also obtained, and ...

In most cooperative breeders, dominants suppress the reproduction of subordinates. However, two previous studies of Neolamprologus pulcher, a cooperatively breeding cichlid fish, have suggested that socially subordinate helper males sneak fertilizations from dominant breeding males. If such sneaking does occur, both theoretical work and empirical studies of other fish species suggest that sperm...

The article reevaluates the reception of Mendelism in France, and more generally considers the complex relationship between Mendelism and plant breeding in the first half on the twentieth century. It shows on the one side that agricultural research and higher education institutions have played a key role in the development and institutionalization of genetics in France, whereas university biolo...

Abstract This article presents the results of level feeding and health status dairy cows in a commercial farm on content main components milk (fat, protein, urea). The aim research was to study productivity composition cows, analyze basic nutrients diet farm. breeds purebred Holstein cattle with high genetic potential for productivity. milking herd formed 2009 basis 600 heads Holstein-Friesian ...