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Often, horse breeders take the mares to another farm to breed thoroughbred horses.
Stories relacionadasEl worldthe smallest horse in the mysterious death of 21 horses died Why horses? But scientists say the Czech Republic when they return to their regular precincts begin to have sex with horses from the herd to hide authorship Colt.


When that is not possible in many cases the mares abort the baby.
This sexual behavior may be an evolutionary response of horses to avoid the risk of infanticide, whichis observed in many species, or when the males kill the colts in their struggle for dominance in the herd.
Scientists say this may explain the high level of pregnancy loss in horses.
The study was led by Ludek Bartos Institute for the Study of Animal Science of the Czech Republic, and was published in the journal Behavioral Ecology and Sociobiology.
According to research, a third of the mares that were bred to horse stables other than their own lost their babies.
“None of the horses that were paired with the same stable aborted,” said Bartos. And the mares that were completely separated from the horses in his stable and therefore not found ways to hide the paternity of their offspring, were more likely to abort.
According to experts, “avoiding the loss of energy in producing offspring that are subject to infanticide.”


Paternity Testing
The idea that domesticated horses could adopt this strategy came from a study of infanticide in zebras.
To avoid inbreeding in these animals in captivity, many zoos introduce an exemplary way in the pack. But Professor Bartos team found that this practice increases the likelihood of losing the pregnancy.
Previous research conducted by him showed that most of the babies were aborted.
“If a male is introduced into the herd shortly after the female was pregnant, the probability that the horse survived was less than 5%,” he said.
“The survival rate increased to 60% if the horse was over the first month after birth.”
Bartos said that zebras and domesticated horses have similar strategies to abort.
For him, the horses probably “take the decision” to terminate the pregnancy.
Chemically induced abortion is a phenomenon well known in zoology.
It is known as “Bruce effect” and has been studied mainly in rodents, in which the smell of urine from a male leads to abort females.
Although the mechanism behind this high rate of abortions in horses is not known with precision, Professor Bartos noted that the study has a practical message for horse breeders.
“The practice of transporting mares to mate with a horse at another barn and then returns to its usual place next to his pack male samples is inadequate.”
“It’s very possible that this is one of the main causes of the high percentage of termination of pregnancies in horses”, he added.

Chino:
母馬有很高的概率失去與馬交配的後代時，從其他群或穩定比他們自己。

通常情況下，馬母馬育種採取到另一個農場繁殖純種馬。
故事relacionadasEl worldthe最小的馬在神秘死亡的21匹馬的馬死了，為什麼？但是科學家們說，捷克共和國，當他們回到自己的選區開始有經常性與馬匹從牛群隱藏著作權小馬。
當這是不可能的，在許多情況下，母馬中止嬰兒。
這種性行為可能是一個漸進的響應，以避免風險馬匹的女嬰，這是觀察到許多物種，或者當殺雄馬隊主導權的鬥爭中的羊群。
科學家說，這可能解釋了高層次的流產中的馬匹。
領導這項研究是由Ludek巴托斯研究所動物科學的研究，捷克共和國，並發表在雜誌行為生態學和社會生物學。
根據研究，三分之一的母馬被培育到馬厩其他比自己失去了他們的嬰兒。
“無的馬匹被搭配同穩定中止，說：”巴托斯。
而母馬被完全分開，馬在他的穩定，因此不想方設法掩蓋陪他們的後代，更可能中止。
據專家介紹，“避免損失的能源，生產的後代，受殺嬰。”


親子鑑定
這個想法，馴養馬匹可以採用這種策略的研究來自於斑馬殺嬰。
為了避免近親繁殖，這些動物在圈養，許多動物園模範地介紹了包。但巴托斯教授研究小組發現，這種做法增加了可能性失去懷孕。
以前的研究表明，由他進行大部分的嬰兒胎死腹中。
“如果有男性引入後不久，一群女性懷孕後，馬的概率存活了不到5％，”他說。
“生存率提高到60％，如果這馬是在出生後第一個月。”
巴托斯說，斑馬和馴養馬匹也有類似的策略，以中止。
對他來說，馬可能“採取的決定”終止妊娠。
人工流產是一種化學現象眾所周知，在動物學。
這是被稱為“布魯斯效應”，主要研究了在囓齒類動物，其中臊從男性導致流產女性。
雖然這背後的機制率高墮胎馬不知道精確，巴托斯教授指出，該研究具有一定的實用信息為馬育種。
“實踐運送母馬和馬交配，在另一個穀倉，然後返回到其正常的位置上他的背包男性樣本是不夠的。”
“這是非常可能的，這是一個主要的原因是高比例終止妊娠的馬”，他補充說。