The reindeer`s antlers make the beauty and the pride of a male, being a reliable weapon during spring tournaments. In autumn the antlers are no longer needed, so reindeers shed the antlers and grow them up anew in the next season. With the majority of the reindeer types, the male sex hormones control the growth of the antlers. But the reindeer`s doe has also got antlers. A pregnant doe carries antlers throughout winter, as the antlers help a doe to get food from under the snow, to keep off predators and males carrying no antlers, so that they would not interfere with the doe`s pasturing. The scientists have found out that the females` antlers growth mainly depends on the estradiol (female sex hormone) action.
The case with the males is not that simple. When the males are on heat, that being the period of the most rapid growth of the antlers, the concentration of several hormones, both male and female, increases in the reindeers` blood, that is why it is difficult to judge which specific hormone expedites the antlers` growth. The Soviet biologist I. I. Shmalgauzen assumed in his studies that not only the reindeer sex glands effected the antlers` growth, but the antlers when growing also produced the hormones which regulate the sex gland function. The research carried out by M.F. Borisenkov (Institute of Physiology, Komi Scientific Center, Ural Branch, Russian Academy of Sciences, Syktyvkar) has proved that the newly-growing antlers` cutting off changes the hormone status of the organism, although it does not impact the testicle endocrine function.
The research was carried out on the adult males from the deer-raising agricultural co-operative farm called `Olenevod`, town of Vorkuta. In June, 1.5-2 months after the mass fawning, the farm staff fulfilled the regular cutting of the reindeers` antlers taking proper care of the wounds. A day after the operation the concentration of progesterone hormone increased in the blood serum of all the animals, for the non- emasculated animals this effect lasting four months, till autumn. After that no more blood tests were taken. In autumn the males which are lucky to retain the antlers that long normally shed them. This is a natural process, driving no hormonal surges.
Tatiana Pitchugina | alphagalileo
Symbiotic bacteria: from hitchhiker to beetle bodyguard
28.04.2017 | Johannes Gutenberg-Universität Mainz
Nose2Brain – Better Therapy for Multiple Sclerosis
28.04.2017 | Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
28.04.2017 | Event News
20.04.2017 | Event News
18.04.2017 | Event News
28.04.2017 | Medical Engineering
28.04.2017 | Earth Sciences
28.04.2017 | Life Sciences