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
More genes are active in high-performance maize
19.01.2018 | Rheinische Friedrich-Wilhelms-Universität Bonn
How plants see light
19.01.2018 | Albert-Ludwigs-Universität Freiburg im Breisgau
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy