Male infanticide in captive plains zebra, Equus burchelli

Pluháček, Jan; Bartoš, Luděk

doi:10.1006/anbe.1999.1371

Cited by 45 publications

(39 citation statements)

References 23 publications

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“…Band type influenced foaling success, confirming our previous research that showed that mares in multi-stallion bands are more protective of their foals than mares in single-stallion bands, possibly due to the risk of infanticide (33), and that they have lower reproductive success (6). Infanticide of nonpaternal offspring has been reported in the harem-dwelling equids (34)(35)(36), including feral horses (37), and in multi-stallion bands, where at least one stallion is not the father of each foal (33). Our study confirms the important role of male harassment on female sociality (6), which we show can be reduced through social integration with other females.…”

Section: Discussionsupporting

confidence: 84%

Social bonds between unrelated females increase reproductive success in feral horses

Cameron

Setsaas

Linklater

2009

Proc. Natl. Acad. Sci. U.S.A.

459

413

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In many mammals, females form close social bonds with members of their group, usually between kin. Studies of social bonds and their fitness benefits have not been investigated outside primates, and are confounded by the relatedness between individuals in primate groups. Bonds may arise from kin selection and inclusive fitness rather than through direct benefits of association. However, female equids live in long-term social groups with unrelated members. We present 4 years of behavioral data, which demonstrate that social integration between unrelated females increases both foal birth rates and survival, independent of maternal habitat quality, social group type, dominance status, and age. Also, we show that such social integration reduces harassment by males. Consequently, social integration has strong direct fitness consequences between nonrelatives, suggesting that social bonds can evolve based on these direct benefits alone. Our results support recent studies highlighting the importance of direct benefits in maintaining cooperative behavior, while controlling for the confounding influence of kinship.equid ͉ friendship ͉ social structure ͉ alliances ͉ sociality

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Section: Discussionsupporting

confidence: 84%

Social bonds between unrelated females increase reproductive success in feral horses

Cameron

Setsaas

Linklater

2009

Proc. Natl. Acad. Sci. U.S.A.

459

413

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“…Most infanticidal attacks by stallions occur before the foal reaches one month (Pluhacek & Bartos 2000) and in this case, the foal was recently born. Infanticide imposes direct fitness consequences on the parents of the offspring, especially the mother.…”

Section: Discussionmentioning

confidence: 88%

An infanticide attempt by a free-roaming feral stallion ( Equus caballus )

Gray

2008

Biol. Lett.

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Infanticide by adult males occurs in a variety of species. While infanticidal attacks have been documented in several equid species in captivity, it has never been witnessed in free-roaming feral horses. I report an infanticide attempt by a free-living feral stallion on a recently born female foal. The stallion picked up the foal by the shoulders, tossed it around twice and bit in on the neck several times. The dam of the foal charged the stallion and successfully protected her foal from additional attacks. The foal survived the attack and later weaned successfully. The stallion recently took over the band and was excluded as the sire through genetic analysis. While this type of attack is rare, this case lends support to the sexual selection hypothesis and further demonstrates that equids have evolved with the risk of infanticide. Furthermore, it shows that maternal protectiveness can be successful against attacks by infanticidal males.

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“…E.g. the introduction of a stallion, which was not sharing an enclosure with the mare in time close to conception, highly increases the risk of abortion or occurrence of infanticide after parturition in equids (Pluháček and Bartoš 2000, Gray 2009, Bartoš et al 2011. The pregnancy diagnosis could help to prevent such events.…”

Section: Discussionmentioning

confidence: 99%

Non-invasive Pregnancy Diagnosis from Urine by the Cuboni Reaction and the Barium Chloride Test in Donkeys (Equus asinus) and Alpacas (Vicugna pacos)

Kubátová¹,

Fedorova²,

Hyniová³

2016

Polish Journal of Veterinary Sciences

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The aim of the research was to evaluate two chemical tests for non-invasive pregnancy diagnosis from urine, the Cuboni reaction and the barium chloride test, in donkeys (Equus asinus) and alpacas (Vicugna pacos). The research was carried out from April 2013 to September 2014. Urine samples were collected on five private Czech farms from 18 jennies and 12 alpaca females. Urine was collected non-invasively into plastic cups fastened on a telescopic rod, at 6-9 week intervals. In total, 60 and 54 urine samples from alpacas and jennies, respectively, were collected. The Cuboni reaction was performed by the State Veterinary Institute Prague. The barium chloride test was done with 5 ml of urine mixed together with 5 ml of 1% barium chloride solution. Results of the Cuboni reaction were strongly influenced by the reproductive status of jennies; the test was 100% successful throughout the second half of pregnancy. However, no relationship was found between the real reproductive status of alpaca females and results of the Cuboni reaction. It was concluded that the barium chloride test is not suitable for pregnancy diagnosis either in donkeys, due to significant influence of season on the results, or in alpacas, because no relationship between results of the test and the reproductive status of alpaca females was found. In conclusion, the Cuboni reaction has potential to become a standard pregnancy diagnostic method in donkeys.

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Male infanticide in captive plains zebra, Equus burchelli

Cited by 45 publications

References 23 publications

Social bonds between unrelated females increase reproductive success in feral horses

Social bonds between unrelated females increase reproductive success in feral horses

An infanticide attempt by a free-roaming feral stallion ( Equus caballus )

Non-invasive Pregnancy Diagnosis from Urine by the Cuboni Reaction and the Barium Chloride Test in Donkeys (Equus asinus) and Alpacas (Vicugna pacos)

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