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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2011 Vol.30 No.3

Effects of Litter Size and Absence of the Father on Body Weight Development in Mandarin Voles Offspring
Author of the article:WANG Jian-li1, 2, MA Yong-ping1, YAN Xing-fu1
Author's Workplace:(1. College of Life Science and Engineering, The North University for Nationalities, Yinchuan 750021, China; 2. College of Life Science, Shaanxi Normal University, Xi’an 710062, China)
Key Words:mandarin voles (Microtus mandarinus); litter size; parental investment; tradeoff
Abstract:In order to investigate the effects of variation in litter size (one, two, three and four pups per litterrespectively) and absence of the father (reared by the mother alone) on offspring’s body weight, body weight of the laboratory population of mandarin voles (Microtus mandarinus) were measured and analyzed on different postnatal phase. IGR (Instantaneous Growth Ratio) of body weight is the highest from postnatal days P1 to P7 and declines thereafter. As well, the gain of body weight is the highest from P28 to P35 (P<0.05). No significant difference was found in weight of litters with one, two, three and fourpups on P7, however, the body weight of pups from litter size of two is much greater than that of pups from other litters size at weaning age (P21) (P<0.05). Moreover, the weight of pups reared by the mother alone is lighter than that of pups reared by the mother and father (P<0.05). These results suggested thatvariation in litter sizemay lead to variation in physical development during lactation in mandarin voles. There was a significant effect of the absence of the father on offspring physical growth by decreasing parental investment, which may be related with the facts that the mandarin vole is socially monogamous and biparental care.
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