Telomere length qPCR measurements using a multiplex monochrome quantitative PCR (MMQPCR) approach; Linear mixed-effects model describing the variation in offspring telomere length using brood size manipulation, year, day of hatching and chick parasitic young as fixed factors.; Statistical analyses testing for quadratic effects of parental age, interactive effects of parental age, and nestling parasite load as possible sources of variation in offspring telomere length;Image for journal cover CriscuoloFrançois ZahnSandrine BizePierre 2017 Description of the methodology used to measure telomere length using a multiplex qPCR approach; Statistic table; Description of additional statistical tests; Credits: Pierre Bize