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Yolk testosterone levels and dietary carotenoids influence growth and immunity of grey partridge chicks.

Abstract：

:Early maternal effects in the form of substances accumulated in the egg, such as carotenoids and hormones, can be physiologically relevant for a good development of offspring. It has been found in different species that testosterone (T) can be beneficial to offspring by increasing growth rate, but detrimental by reducing immunocompetence and increasing oxidative stress. Carotenoids on the other hand are suggested to be beneficial because they can counteract the oxidative stress and the immune-depressive effect of T. In this study we analyzed the effect of prenatal T exposure in the grey partridge. We injected eggs with three doses of T (high, intermediate, and physiological). After hatching, chicks exposed to a prenatal high dose of T were fed with two diets (rich or poor) differing in beta-carotene content. We found a significant effect of T on both chick growth and cell-mediated immunity, with high T doses resulting in detrimental effects while low doses were beneficial. Detrimental effects of the high dose of T on immunity were mitigated by beta-carotene consumed in the diet. The differences between groups were observed in the early period of life (age 10 days for mass, and age 10 and 21 days for immunity), and disappeared in the following period, and up to 1 and 2 years later. Overall, our observations show that T in the egg is not detrimental but beneficial, and that negative effects are found only at supraphysiological concentrations. The negative effects of T on immunity could be balanced if chicks could consume a diet rich in beta-carotene.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Cucco M,Guasco B,Malacarne G,Ottonelli R,Tanvez A

doi

10.1016/j.ygcen.2007.12.010

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

418-25

issue

2

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(08)00005-1

journal_volume

156

pub_type

杂志文章

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