Energy intake reaches a limit despite abundant food supply
1 Jul 2009, 1614 Hrs

Add comment          Mail          Print          Write to Editor

* Education Directory * Exam Results * Who is Who * Information *Tutorials * Articles * Quote * Classified

Washington, July 1 Contradicting Charles Darwin's theory, scientists have now shown that despite abundant food supply, energy intake reaches a limit even in animals with high nutrient demands, such as lactating females.

Darwin and his contemporaries postulated that food consumption in birds and mammals was limited by resource levels, which meant that animals would eat as much as they could while food was plentiful and produce as many offspring as this would allow them to.

Scientists at the Research Institute of Wildlife Ecology in Vienna have now suggested that energy intake reaches a limit due to active control of maternal investment in offspring in order to maintain long-term reproductive fitness.

The new research led by Dr Teresa Valenca showed that Brown hares could increase their energy turnover and rate of milk production above normal levels when their energy reserves were low, or when their offspring were kept in cooler temperatures.

That indicated that, ordinarily, the hares were operating at below their maximum capacity.

It also showed that this is not due to any kind of physiological constraint, such as length of digestive tract or maximum capacity of mammary glands.

As the hares were also provided with plentiful food, there could be no limitation of energy turnover due to food availability.

The way that females regulated their energy expenditure according to pup demand and their own fat reserves but did not exceed certain levels was in line with the group's theory that using energy at close to the maximum rate has costs for animals which may compromise their ability to successfully reproduce in the future.

For example, if a hare puts most of its energy into a litter of pups then it will have little left over for growth and body repairs, which may shorten its life or make it less able to produce or care for young in the future.

Thus, by actively limiting the rate of energy turnover, a mother can prevent this and maintain a higher level of reproductive success over her lifetime.

The study will be presented at the Society for Experimental Biology Annual Meeting in Glasgow. (ANI)

Related Latest

Indian Navy vessel on solo circumnavigation of world reaches New Zealand Gecko's tail an energy powerhouse, say scientists Fergie stands by hubby despite stripper allegations Bihar doctors continue strike despite rights panel's threat India to have guidelines for probiotic food by 2010 HIV infected women sell nutritious food items in Gujarat Bihar's per capita energy consumption lowest: Report Centre prepares Vision 2015 document for food processing industries CO2 emissions caused by humans rise 2 percent despite global financial crisis India's annual food inflation rises to 14.55 percent

Related Latest

Warnie says 'Pup' Clarke is his new bunny in 20-20 match Assam bomb blast death toll rises to seven (Update Assam blast) Windies won't wilt against Aussies, says coach Williams Central Excise, Customs official protest in Delhi for better pay Teenager charged for mutilation murder of Brit Indian Orissa Govt orders heavy security deployment in Korapat District Ferguson's overhaul plan puts greats under scrutiny Arrest warrant issued against two ministers in Karzai's cabinet Former Australian cricket stars question Clarke's capacity to captain Headley always felt pulled between East and West: Investigators

• Windies won't wilt against Aussies, says coach Williams
• Assam bomb blast death toll rises to seven (Update Assam blast)
• Orissa Govt orders heavy security deployment in Korapat District
• Warnie says 'Pup' Clarke is his new bunny in 20-20 match
• Central Excise, Customs official protest in Delhi for better pay

• भारतीय क्रिकेट की मजबूत दीवार
• कंगारूओं के आगे ढेर, चीतों से कैसे मुकाबला करेंगें शेर
• Reducing greenhouse gases may not be enough to slow global warming
• बीकानेर महापौर चुनावः एक विश्लेषण
• Deepawali: The Festival Of Lights