Eggshell spot scoring methods cannot be used as a reliable proxy to determine pigment quantity
نویسندگان
چکیده
K. Brulez ([email protected]) and S. J. Reynolds, Centre for Ornithology, School of Biosciences, College of Life and Environmental Sciences, Univ. of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. – P. Cassey, School of Earth and Environmental Sciences, Univ. of Adelaide, SA 5005, Adelaide, Australia. – A. Meeson, School of Psychology, Univ. of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. – I. Mik š í k, Inst. of Physiology, Academy of Sciences of the Czech Republic v.v.i., CZ-14220 Prague, Czech Republic. – S. L. Webber, NHBS Ltd., 2 – 3 Wills Road, Totnes, Devon, TQ9 5XN, UK. – A. G. Gosler, Edward Grey Inst. of Field Ornithology, Dept of Zoology, South Parks Road, Oxford, OX1 3PS, UK.
منابع مشابه
Eggshell Pigmentation Study in Blue-shelled and White-shelled Ducks
This study attempted to clarify the difference in eggshell pigmentation between blue-shelled ducks (BSD) and whiteshelled ducks (WSD). The eggshell pigmentation deposition process is discussed. Ultraviolet spectro-photometer and HPLC were used to determine the biliverdin concentration in the shell gland, uterus liquid and eggshell at 6, 12, 18, 20, 23.5 h post-oviposition. The biliverdin concen...
متن کاملEggshell Appearance Does Not Signal Maternal Corticosterone Exposure in Japanese Quail: An Experimental Study with Brown-Spotted Eggs
Reproduction is a critical period for birds as they have to cope with many stressful events. One consequence of an acute exposure to stress is the release of corticosterone, the avian stress hormone. Prolonged stress can have negative impacts on the immune system, resulting in, for example, increased oxidative stress. Through maternal effects, females are known to modulate their investment in e...
متن کاملCondition-dependent strategies of eggshell pigmentation: an experimental study of Japanese quail (Coturnix coturnix japonica).
A relationship has been suggested between eggshell colour and female body condition based on the opposing antioxidant properties of the two main eggshell pigments: the antioxidant biliverdin (blue-green) and the pro-oxidant protoporphyrin (brown). We hypothesized that experimentally food-restricted females with low antioxidant capacity would deposit more protoporphyrin and less biliverdin in th...
متن کاملChanges in pigment, spectral transmission and element content of pink chicken eggshells with different pigment intensity during incubation.
Objective. The objective of this study was to investigate changes in pigment, spectral transmission and element content of chicken eggshells with different intensities of pink pigment during the incubation period. We also investigated the effects of the region (small pole, equator and large pole) and pink pigment intensity of the chicken eggshell on the percent transmission of light passing thr...
متن کاملرویکرد تحلیلی در تعیین میزان بهینه ی قراردادهای پیش فروش
Due to volatility of spot power prices and in order to manage risk of a Generating Company (GenCo), this paper addresses determination of optimal quantity of bilateral forward contracts which can be formulated as an optimization problem. In this framework, in addition to selling electricity to spot market, bilateral forward contracts can be traded between Gencos and customers. Finding an optima...
متن کامل