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Teenage pregnancy in horses… | Perissodactyla
https://perissodactyla.wordpress.com/2014/03/05/teenage-pregnancy-in-horses
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. March 5, 2014. Teenage pregnancy in horses. Or, why is foaling by 2-year-olds not more common. Young, still growing, mares face greater challenges to succesfully foaling (image source: http:/ www.thehorse.com. For horses the transition to adulthood occurs from about just before their first birthday through their second year and, for some, into the beginning of their 3. A demanding, vulnerable time. Where the...
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Absolute limits to population growth IV – imagine variation | Perissodactyla
https://perissodactyla.wordpress.com/2013/08/04/absolute-limits-to-population-growth-iv-imagine-variation
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. August 4, 2013. Absolute limits to population growth IV imagine variation. In our imaginary population growing 30% per year, less than 8.5% of the population can die. And more than 78% of mares, and at least 52% of 2-year-old mares, must foal every year. There will be good years and bad years. 8211; the weather. Climates impose irregular cycles on wild animals’ resources because they are quasi-periodic.
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Wild horses everywhere – NZ | Perissodactyla
https://perissodactyla.wordpress.com/2014/11/10/wild-horses-everywhere-nz
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. November 10, 2014. Wild horses everywhere – NZ. Beginning with his first chase aged 15 in 1915, Harvey Morrow caught his first wild horse in the winter of 1916 around Arapuni in the Waikato. He wrote a small book,. New Zealand Wild Horses. And first half of the 20. March 1876. But horses were certainly present before this time in other places in North Island releases and escapes from Maori and migrant, t...
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Two-year-olds can foal too – but it is uncommon | Perissodactyla
https://perissodactyla.wordpress.com/2014/02/10/two-year-olds-can-foal-too-but-it-is-uncommon
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. February 10, 2014. Two-year-olds can foal too – but it is uncommon. For many years during the early, vigorous debates about how fast wild horse populations could grow, the ability of younger mares to foal, especially 2-year-olds, was unknown. The first few studies found that 2-year-olds did not foal and so it was believed unlikely. And Lee Boyd from Wyoming’s Red Desert (1978-79) [2]. Mares most often foal f...
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Populations’ reproductive rates compared – how high, how variable? | Perissodactyla
https://perissodactyla.wordpress.com/2014/01/05/populations-reproductive-rates-compared-how-high-how-variable
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. January 5, 2014. Populations’ reproductive rates compared – how high, how variable? The ratio of foals to other horses, or foals as a percentage of total population, are comparatively easy to gather and interpret reproductive rates. That have a direct relationship to how much a population grows or declines each year (lambda, λ) and the population’s instantaneous rate of increase or decrease (r). Where the fo...
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Glossary | Perissodactyla
https://perissodactyla.wordpress.com/glossary
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. This glossary is developing as posts are added. Allele one of two or more genes that can occupy the same place (locus) in a chromosome and determine the same trait, e.g. coat colour. Anthropomorphism – attibuting human behaviour, expectations, ideals to an animal. Behavioural ecology –. Biodiversity – all the species that live in an environment or place. Biological fitness –. Palaeolithic – the period ...
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Feral horse colonisation, economy and capture – New Zealand | Perissodactyla
https://perissodactyla.wordpress.com/2015/08/04/feral-horse-colonisation-economy-and-capture-new-zealand
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. August 4, 2015. Feral horse colonisation, economy and capture New Zealand. Century and persisted during the first half of the 20. The earliest report of free-roaming horses in New Zealand is in the diary of Mr R. T. Batley in the upper catchment of the Moawhango River, 15. March 1876, on the high volcanic plateau of the central North Island [ 1. New Zealand’s first-nation people, the Maori, adopted and...
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Reproduction and population growth – how many foals? | Perissodactyla
https://perissodactyla.wordpress.com/2013/10/11/reproduction-how-many-foals
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. October 11, 2013. Reproduction and population growth how many foals? The number of foals when compared to the number of other horses or total population is a useful measure of a population’s reproduction because it is so easily obtained and interpreted. It is also an indication of a population’s potential to grow because it cannot grow faster than it produces foals. Importantly, the measurement does not requ...
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Bibliography | Perissodactyla
https://perissodactyla.wordpress.com/authors-bibliography
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. I will be adding to this bibliography as blogs are posted. All citations of literature are listed first in alphabetical order of authors and second chronological order by date of publication. Appleby M., 2008. Eating Our Future: The Environmental Impact of Industrial Animal Agriculture. World Society for the Protection of Animals. Denniston, R.H., ed), pp. 185-204, University of Wyoming, Laramie. Conley, W&#...
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Absolute limits to population growth I – detecting hyperbole | Perissodactyla
https://perissodactyla.wordpress.com/2013/06/06/absolute-limits-to-population-growth-detecting-hyperbole
Science for the appreciation, management and conservation of horses and other odd-toed ungulates. June 6, 2013. Absolute limits to population growth I – detecting hyperbole. The most extreme, sometimes alarmist, claims about the growth of wildlife populations are easily repudiated because they are biologically impossible. Biology has limits. Population growth is biologically capped. I am not speaking here of the limits imposed by resources. Twins – extraordinarily rare in horses. It is also not possible ...