The aims of this study were to obtain information on the mechanism of molting and the prolactin hormone levels affecting egg production. The study utilized AP (crossbred of Alabio ♂ with Peking ♀) and PA (crossbred of Peking ♂ and Alabio ♀ ducks) with a total of 180 birds. The observed variables were the duration of cessation of egg production before and after molting, the prolactin hormone lev...

There is no argument that understanding the geometry around optimal configuration is an important component for efficiency and injury prevention (Wisbey-Roth 2009), and some leading “Bike-Fit” proponents argue the neuromuscular perspective (Steve Hogg 2007). There are also endless references to optimal pedalling technique“spinning the pedals”, “elegant”, “wipe the mud of the shoe”, “like a duck...

Question: Can field measurements of stress hormones help us to assess the prudent parent hypothesis in a long-lived seabird? Organism: Black-legged kittiwake, Rissa tridactyla. Location: Duck and Gull Islands, Cook Inlet, Alaska, USA. Methods: We examined the statistical relationship between the stress hormone corticosterone and mortality in black-legged kittiwakes. We built a demographic model...

In this study was investigated the structure of pecten oculi in the ostrich, duck, pigeon, turkey, and starling. The pecten oculi of the ostrich was vaned type and made up primary, secondary, and few tertiary lamellae. However, duck, pigeon, turkey and starling had a pleated-type pecten oculi which displayed folded structure. The numbers of pleats of the pectens were 12, 13-14, 21-22, and 17 in...

This study extends permeability (P) data on chloride, urea and water in red blood cells (RBC), and concludes that the urea transporter (UT-B) does not transport water. P of chick, duck, Amphiuma means, dog and human RBC to (36)Cl(-), (14)C-urea and (3)H2O was determined under self-exchange conditions. At 25°C and pH 7.2-7.5, PCl is 0.94 × 10(-4)-2.15 × 10(-4) cm s(-1) for all RBC species at [Cl...

The effects of gaseous ozone exposure on the bacterial counts and oxidative properties were evaluated in duck and chicken breast fillets, which were stored under a continuous flux of gaseous ozone (10×10(-6) kg O3/m(3)/h) at 4±1℃ for 4 d. The ozone generator was set to on for 15 min and off for 105 min, and this cyclic timer was set during storage. Ozone effectively reduced the growth of colifo...

The combination of planting and breeding, an agricultural production system, makes full use land, ecological space time, increasing the utilization rate yield both plant animal production. This experiment aimed to explore effects grape-duck farming system by analyzing behavior, meat quality, fecal microbiota ducks soil microbiota. results differed significantly on expressions positive behaviors...

OBJECTIVE The bursa of Fabricius (BF) is a central humoral immune organ belonging specifically to avians. Recent studies had suggested that miRNAs were active regulators involved in the immune processes. This study was to investigate the possible differences of the BF at miRNA level between two genetically disparate duck breeds. METHODS Using Illumina next-generation sequencing, the miRNAs li...

Since April 2010, a severe outbreak of duck viral infection, with egg drop, feed uptake decline and ovary-oviduct disease, has spread around the major duck-producing regions in China. A new virus, named BYD virus, was isolated in different areas, and a similar disease was reproduced in healthy egg-producing ducks, infecting with the isolated virus. The virus was re-isolated from the affected du...

Lysozyme was purified from a pooled sample of Peking duck egg whites by ion exchange chromatography and gel filtration. Three different lysozymes were found, and each was shown to be pure by several criteria. The three enzymes were like chicken lysozyme in molecular size and specific activity, although they could be distinguished from it, as well as from one another, by electrophoretic and immu...