NDLI: Age-specific fertility rates of the Jeju pony ( Equus caballus)

Content Provider	Springer Nature Link
Author	Rho, Jeong R. Srygley, Robert B. Choe, Jae C.
Copyright Year	2004
Abstract	Age-specific fertility is an essential parameter of life history. Here we report age-specific fertility rates, measured as the number of foals per mare per year, for Jeju ponies aged 2–28 years. The total sample consisted of 545 foals produced by 178 mares from 1988 to 2002. The mean fertility rate across all ages of the mares was 0.65 foals/mare per year (±0.24 SD). The fertility rates were above average for the 7- to 8- and 19- to 20-year-old mares, whereas they were relatively low for mares under 4 years old. The fertility rates tended to increase with the age of the stallion, but the relationship was not significant (n =15, P =0.09). The incidence of inter-birth interval was not associated with the age that the mare first reproduced (n =64 mares, P =0.99). However, mares that reproduced later in life tended to have a reduced fertility rate due to an increase in the duration of inter-birth intervals relative to mares that reproduced earlier (n =4 years of first reproduction, P =0.068). The fertility rates of Jeju ponies were lower than for other horses, perhaps because only one stallion was introduced to a relatively large herd every year. We suggest that the introduction of more stallions to the herd each year would increase fertility rates.
Starting Page	113
Ending Page	117
Page Count	5
File Format	PDF
ISSN	02890771
Journal	Journal of Ethology
Volume Number	22
Issue Number	1
e-ISSN	14395444
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-08-07
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Jeju pony Equus caballus Age-specific fecundity Breeding Fertility of stallion
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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