Navigation Links
The penalty of having a sister -- why sibling sex matters for male saiga antelopes

Having a twin sister could put male saiga antelopes at a reproductive disadvantage, says new research published today. The study shows that male twins with a sister are born lighter than those with a brother, making them smaller than the optimal size for males. The research also shows that saigas are the supermums of the hoofed animal world with no other similar species investing more in their offspring during pregnancy.

The study's results call into question current understanding of the development of male and female foetuses of this species, and give scientists a new insight into the importance of sibling sex and what implications this may have for the animals as they mature.

This study shows that when a female is pregnant with mixed-sex twins, the male foetus does not undergo the substantial amount of growth that occurs in a male foetus with a brother, resulting in a sub-optimal birth weight. Saiga males mate with many females and face strong male-male competition during short mating seasons. This means that size matters for males - being smaller than average is one of the major limiting factors for reproductive success.

Aline Kühl from Imperial College London's Division of Biology, lead author of the paper, explains that although they do not yet understand the precise mechanism behind this suboptimal development in male twins, its existence is clear. "When siblings in a litter vary in sex, maternal investment should be sex-specific, meaning that the male foetus grows bigger than the female. However, it seems there are limitations in the ability of the mother to provision mixed twin litters in the womb," she said.

The researchers point out that mixed-sex litters have been shown to have an impact on animal health elsewhere in the animal world. In dairy cows for example, it is well known that calves from mixed litters are less fit. Female heifers from mixed litters are generally infertile. But unlike dairy cows, in cases o
'"/>

Source:Imperial College London


Page: 1 2 3

Related biology news :

1. One in 14 men having a heart attack drive themselves to hospital
2. Study finds that a womans chances of having twins can be modified by diet
3. Size matters: Preventing large mammal extinction
4. Space matters: Estimating species diversity in the fossil record
5. Bigger brain size matters for intellectual ability
6. UCSB researchers discover shape matters to macrophages
7. Researchers find that bumblebees flower choice matters
8. For Pacific white shrimp, gender matters when competing for food
9. Particle size matters to bacteria ability to immobilize heavy metals
Post Your Comments:
(Date:4/17/2014)... A new modeling study suggests that fish consumption ... infant exposure to long-lived contaminants like persistent organic ... a team of researchers including University of Toronto ... Wania, looks at how different levels of environmental ... behavior of chemicals in the body influenced exposure ...
(Date:4/17/2014)... . Our eyes ... us with a continuous stream of information about our own ... in a car the world glides by us and ... effort, our brain calculates self-motion from this "optic flow". This ... gaze during our own movements. Together with biologists from the ...
(Date:4/17/2014)... honored Clemson professor Rajendra Singh Thursday as a ... and expand solar deployment in the residential, commercial ... Banks Professor of Electrical and Computer Engineering and ... considered a local hero leading the charge across ... in solar power and driving policy changes at ...
Breaking Biology News(10 mins):Fish consumption advisories fail to cover all types of contaminants 2How vision makes sure that little fish do not get carried away 2How vision makes sure that little fish do not get carried away 3How vision makes sure that little fish do not get carried away 4White House honors Clemson professor as 'Champion of Change' for solar deployment 2
... University of Reading,s Centre for Agri Environmental Research suggests ... services in the UK than previously supposed. The research ... Environment . "Pollination services are vital to agricultural ... "as of 2007, 20% of the UK,s cropland was ...
... there are so many species in the sea and how new ... waterline, about 30% of Hawai,i,s marine species are endemic being ... of the highest rates of endemism found worldwide. But where ... for its adaptive radiations (the formation of many species with specialized ...
... how birds can fly so quickly and accurately through dense ... Scientists from Harvard University trained pigeons to fly through an ... literally giving a birds-eye view. "Attaching the camera to ... means we can reconstruct both what the bird sees and ...
Cached Biology News:New study suggests severe deficits in UK honeybee numbers 2Scientists discover that Hawai'i is not an evolutionary dead end for marine life 2Auto-pilots need a birds-eye view 2
(Date:1/15/2014)... 15, 2014 TaiGen Biotechnology Company, Limited ("TaiGen") today ... R-Pharm, a leading Russian pharmaceutical company, to develop and ... Russian Federation , Turkey ... is a novel antibiotic for the treatment of bacterial ...
(Date:1/14/2014)... pet owners drew up their lists of New Year,s resolutions for ... of my furry companion." Nowadays there are pet salons, dog and ... take the little canine or feline darlings along wherever mommy or ... pricey toys at the pet store. But anyone who has ever ...
(Date:1/14/2014)... In recent years, growing suspicion about ... product development and promotion has led to unprecedented levels ... by concerns about the insidious impact of commercialization of ... fines to the world’s biggest pharmas for illegal marketing ...
(Date:1/14/2014)... 14, 2014 Kerr Corporation, a leading manufacturer ... additional how-to information about dual arch impressions on its dental ... Arch Impressions,” the blog entry serves up a list of ... a step-by-step demonstration by Dr. David Little as he crafts ...
Breaking Biology Technology:TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4New Year's Resolution: Give Pets the Gift of Top-Notch Health Care 2The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 2The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 3
... Oct. 1 GeoVax Labs, Inc. (OTC,Bulletin ... vaccines for diseases caused by HIV-1 (Human ... that its company information,will be made available ... an,information distribution service that enables subscribing publicly ...
... WA and VANCOUVER, Oct. 1 /PRNewswire-FirstCall/ - OncoGenex,Pharmaceuticals, ... the BioContact Quebec,2008 annual partnering symposium on October ... at the Chateau Frontenac in Quebec City. OncoGenex, ... a corporate overview,at the conference, including a discussion ...
... 1 Based on the clinical success,of its ... the company has expanded its executive management team ... move to Massachusetts,allows us to consolidate our operations ... "It also gives us access to a wealth ...
Cached Biology Technology:GeoVax Labs, Inc. Information To Be Available Through Standard & Poor's Market Access Program 2Facet Solutions Establishes Corporate Headquarters and Expands Executive Team 2
... TempliPhi 100 Amplification Kit, 100 reactions. ... sequencing in 4-6 h.Generate microgram quantities ... of starting material.Use amplified DNA directly ... from bacterial or M13 liquid cultures, ...
... Microplate Rack inserts fit ... Rack, and allow you to ... capacity, shake deepwell format plates ... many plates from the shaker ...
BD FastImmune EDTA Solution. Applications: Flow Cytometry Storage Temperature: Refrigerate(2 to 8C)...
Spaced cover glasses to promote effective hybridization...
Biology Products: