Pathogens are an important and significant hazard for human and animal health. In recent years, antibiotics are used to treat different types of infection caused by bacterial agents. In veterinary medicine, antibiotics injected into hatching eggs to eliminate pathogens and prevention of egg transmission of disease, but the adverse effects of drugs have always been a major conc...

Red abalone (Haliotis rufescens) sperm detect a waterborne chemical cue released by conspecific eggs, and change their swimming behavior to increase the likelihood of fertilization success. Previously, we isolated the natural sperm attractant by bioassay-guided fractionation and high-performance liquid chromatography, and chemically identified it as the free-amino acid l-tryptophan (l-Trp). In ...

Across many taxa, guarding of fertile mates is a widespread tactic that enhances paternity assurance. However, guarding of mates can also occur during the nonfertile period, and the fitness benefits of this behavior are unclear. Male songbirds, for example, sometimes guard nonfertile females during foraging recesses from incubation. We hypothesized that guarding postreproductive mates may have ...

The cultivation of viruses in fertile hen's eggs has been widely utilized, providing many advantages for virological studies, since the pioneering work of Woodruff and Goodpasture (1931). In most of such works, however, eggs more than 5 days old have been used. Recently, Yoshino (1956) described a technique for experimental infection of the 1-day-old egg, revealing that such an early embryo sup...

The leopard gecko, Eublepharis macularius, has temperature-dependent sex determination (TSD). Previous reports have shown that females are produced predominantly at cool incubation temperatures and males are produced predominantly at warm incubation temperatures (Pattern Ib). We report here that incubation at even higher temperatures (34 and 35 degrees C) produces mostly females (Pattern II). T...

background:the bacterial contamination of fertile eggs isthe most common cause of embryonic death in ostrich hatcheryunits leading to financial loss in ostrich industry. objectives:the aim of this research was to investigate the bacterialcontamination status, with emphasis on escherichia coli, ofostrich hatcheries and the antimicrobial resistance profile ofisolated escherichia coli. methods:ato...

Pathogens are an important and significant hazard for human and animal health. In recent years, antibiotics are used to treat different types of infection caused by bacterial agents. In veterinary medicine, antibiotics injected into hatching eggs to eliminate pathogens and prevention of egg transmission of disease, but the adverse effects of drugs have always been a major conc...

C RE D IT :M A RC O U LI A N A T he honey bee society was famously described as “The Feminine Monarchy” by the cleric Charles Butler in 1634. Honey bees and their relatives—including all hymenopteran societies—qualify for this label because their colonies are headed by one or a small number of fertile queens. These queens produce a large number of sterile or nearly sterile daughter workers and,...

It has been shown in previous studies that fertility can be reduced in overweight broiler breeder (BB) flocks. In an effort to determine the effect of ad libitum feeding on the duration of fertility in BB hens, 60 52-wk-old Shaver Starbro hens were randomly assigned to one of two treatments, ad libitum feeding (F) or restricted feeding (R) to maintain breeder target weights. All hens were reare...

Abstract The main goal of broiler breeders management is producing fertilized egg that can be hatched and to generate hatching eggs will result in saleable chicks. purpose this research was evaluate the effects supplementation Nutricell HyC® (combination 25OHD3 vitamin C) with various levels on fertility breeders. This used 6,158 female Cobb strain which were distributed according a completely ...