Document Detail

Relationship of the Estrogen Surge and Multiple Mates to Cub Paternity in the Giant Panda (Ailuropoda melanoleuca): Implications for Optimal Timing of Copulation or Artificial Insemination.
MedLine Citation:
PMID:  22976278     Owner:  NLM     Status:  Publisher    
The effectiveness of ex situ breeding programs for endangered species can be limited by challenges in mimicking mating competitions that naturally occur among multiple mates in the wild. The objective of this study was to evaluate the impact of timed natural matings and/or artificial inseminations (AI) in the context of the urinary estrogen surge on cub production in the giant panda (Ailuropoda melanoleuca). We used a large cohort of giant pandas, including 12 females and 17 males. DNA paternity exclusion was used to pinpoint accurately the interval during the estrogen surge that coincided with the ideal sperm deposition time to produce offspring. Of the 31 cubs (in 19 pregnancies), 22 (71.0%; 15 pregnancies) were produced from matings occurring on the day of, or the day after, the maximal urinary estrogen peak. Sixteen of the 19 pregnancies (84.2%) produced at least one offspring sired by the first male mating with the dam. There was a preponderance of twins (12 of 19; 63.2%), and dual paternities were discovered in three of 12 twin sets (25%). These findings indicate a strong relationship between the excreted estrogen surge and sperm deposition to achieve pregnancy in the giant panda. To ensure the production of the most genetically diverse young, it is imperative that the most appropriate male mate first and on the day of, or the day after, the highest detected estrogen value. There is no advantage to increasing the number of copulations or mating partners within 1 day of the estrogen peak on the incidence of twinning, although this practice may increase the prevalence of dual paternity in cases of multiple births.
Yan Huang; Hemin Zhang; Desheng Li; Guiquan Zhang; Rongping Wei; Zhi Huang; Yingmin Zhou; Qiang Zhou; Yang Liu; David E Wildt; Vanessa Hull
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-12
Journal Detail:
Title:  Biology of reproduction     Volume:  -     ISSN:  1529-7268     ISO Abbreviation:  Biol. Reprod.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0207224     Medline TA:  Biol Reprod     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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