The negative relationship between offspring number and offspring size provides a classic example of the role of trade-offs in life history theory. However, the evolutionary transitions in egg size and clutch size that have produced this negative relationship are still largely unknown. Since body size may affect both of these traits, it would be helpful to understand how evolutionary changes in ...

Egg storage beyond 7 d is associated with an increase in incubation duration and a decrease in hatchability and chick quality. Negative effects of prolonged egg storage may be caused by changes in the embryo, by changes in egg characteristics, or by both. An adjustment in storage air composition may reduce negative effects of prolonged egg storage because it may prevent changes in the embryo an...

BACKGROUND Intraduodenal bile salts exert negative feedback control on postprandial gall bladder emptying. AIMS We wished to examine whether a similar control mechanism occurs in the fasting state. METHODS Intraduodenal bile salt depletion was achieved by 12 g of cholestyramine. Thereafter, in study A (seven subjects), the effects on gall bladder volume (by ultrasound) and antroduodenal mot...

Background: Intraduodenal bile salts exert negative feedback control on postprandial gall bladder emptying. Aims: We wished to examine whether a similar control mechanism occurs in the fasting state. Methods: Intraduodenal bile salt depletion was achieved by 12 g of cholestyramine. Thereafter, in study A (seven subjects), the effects on gall bladder volume (by ultrasound) and antroduodenal moti...

background: uterine synechiae or asherman's syndrome is a condition that can cause infertility. the present experimental study was designed to establish the rabbit as an animal model for human asherman's syndrome using the endometrial curettage. methods: in an experimental study, female adult rabbits (n=18) were randomly divided into intact and ovariectomized groups. one third of caudal part of...

Diaprepes abbreviatus (L.) is a major pest of Florida citrus. Adult females lay eggs in masses sealed between leaves in the citrus canopy, and recently-hatched neonate larvae drop to the soil and feed on roots. The coccinellid species, Cycloneda sanguinea (L.), Harmonia axyridis Pallas, and Olla v-nigrum Mulsant, are generalist predators that consume a wide range of citrus pests, although they ...

The roles of the ovary and egg case in the regulation of the development and activity of the corpora allata were studied in Blattella germanica adult females. The corpora allata of ovariectomized females exhibit a delayed pattern of development and activity compared with intact females. Implantation of a young ovary into ovariectomized females resulted in a faster activation of the corpora alla...

The purpose of this study was to find out how the semen quality pesisir cattle after addition trehalose egg yolk tris diluent. research material in form fresh obtained from aged approximately 4 years and had been tested by observing before dilution.. This used a randomized block design with treatments replications. treatment given consisted control, 0.5%, 1%, 1.5%. variables included motility, ...

The effect of genetically modified (GM) feed components comprising soya bean meal and maize on the performance indices (reproduction, survival rate, growth, egg production, relative weight of chosen internal organs, and basic chemical composition of breast muscle and egg yolk) of Japanese quails was investigated during a 10-generation trial. A total number of 8,438 healthy quail chicks were use...