Magnetite-containing structures in the upper beak of birds have been described as putative magnetoreceptors [1-4], but so far, all positive evidence indicating their influence on behavior has come from laboratory studies using rather unnatural stimuli (e.g., [5-7]). Here, we demonstrate these receptors' possible role in a natural situation: we released pigeons with these receptors deactivated b...

The Effect of Resveratrol Antioxidant in Nano Liposome and NLC Forms Rooster Semen Extender During Storage at 4˚C

The natural polyamines spermine and spermidine, and the diamine putrescine, were extracted from rooster testis cells separated by sedimentation at unit gravity, and from vas-deferens spermatozoa. The ratios spermine/DNA and spermidine/DNA were kept relatively constant throughout spermatogenesis, whereas the ratio putrescine/DNA rose in elongated spermatids. The cellular content of spermine, spe...

The event of Peter’s denials of Christ is a frequent subject of Sunday sermons. The prediction and outplaying of the denials, as recorded in the four Gospels, is a powerful reflection of a condition of our relationship with Christ—that our faith is more vulnerable than we care to admit.1 But a small thorny issue surrounds the Gospel accounts of this event, one that is a nagging distraction to s...

A sensitive, specific, and rapid immunochemical method for the measurement of the synthesis of lipoproteins in rooster liver is described. Incubation of liver slices with [aH]leucine resulted in the incorporation of radioactivity into protein material that could be precipitated from crude extracts by a monospecific antibody directed against the antigen common to plasma very low density and low ...

This study examined the effects of infrared beak treatment (IR-BT) and hot blade beak trimming (HB-BT) on beak length and production in laying hen pullets. Seventy-two 1-d-old birds were randomly assigned to the HB-BT, IR-BT, or control group. Birds were pair housed by treatment, and beak images and production indices were obtained posttreatment at fixed intervals for 10 wk. Immediately after t...

The Effect of using Different Levels Luteolin on Reducing Malondialdehyde Content and Increasing the Motility Viability Ross 308 Rooster Sperm during Cryopreservation Thawing Process

Vertebrate dentitions are extraordinarily diverse in both morphology and regenerative capacity. The teleost order Tetraodontiformes exhibits an exceptional array of novel dental morphologies, epitomized by constrained beak-like dentitions in several families, i.e., porcupinefishes, three-toothed pufferfishes, ocean sunfishes, and pufferfishes. Modification of tooth replacement within these grou...

BACKGROUND Crossed beaks have been reported to occur in Appenzeller Barthuhn, a local Swiss chicken breed. The assumed causes for this beak deformity which are also seen in other bird species including domestic chickens, range from environmental influences to genetic factors. The aim of this project was to characterize the prevalence, the phenotype, and the underlying genetics of crossed beaks ...