Genetic Parameter Estimates for Estrus Duration and Urinary Hormone Levels in Captive Female Giant Pandas
Mammalian Biology（2023）
Chengdu Research Base of Giant Panda Breeding
Abstract
In captive giant pandas ( Ailuropoda melanoleuca ), both urinary estrogen and progesterone levels have been dynamically measured and routinely involved in the assisted reproduction. Yet the genetic contribution to phenotypic variability on these reproductive hormone levels remains largely unknown, which may be helpful for understanding the influence of mating system on reproduction. In this study, we used the longitudinal measures of urinary estrogen and progesterone levels, which were collected on 59 female giant pandas from 2007 to 2021, for estimating the heritability and genetic correlations of 3 estrus-related indicators, including estrus length (EL), estrogen concentration (EC), and progesterone concentration (Pg). The genetic relationship matrix was derived from pedigree records, and variance components were estimated by a three-trait animal model. Our results revealed that EC had the highest heritability (± SE) of 0.47 ± 0.08, which was followed by Pg of 0.38 ± 0.10 and EL of 0.19 ± 0.08. Weak positive genetic correlations (± SE) were observed between EL and EC (0.47 ± 0.32), and between EC and Pg (0.31 ± 0.26). To our best knowledge, this is the first study to estimate heritability and genetic correlation for estrus-related indicators in captive giant pandas, which could be taken into consideration to optimize the reproduction management of this vulnerable species.
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Key words
Giant panda,Estrogen,Progesterone,Estrus length,Heritability,Genetic correlation
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