Kaseda Y, Khalil A M, Ogawa H
Faculty of Agriculture, Miyazaki University, Japan.
Equine Vet J. 1995 Sep;27(5):368-72. doi: 10.1111/j.2042-3306.1995.tb04072.x.
The stability of relationships between harem stallions and mares (consort relations) was investigated and the durations of inter partum intervals were determined in order to establish if there was any correlation between the stability of consort relation and reproductive success of mares in Misaki feral horses. Thirty-four mares were observed continuously for more than 5 years. The lifetime stability was 80-100% (mean 92.4%) for 16 mares, 60-79% (mean 70.4%) for 10 mares and 0-59% (mean 27.9%) for 8 mares. The continuous length (years) of specific consort relations was 2-10 years and was found to correlate significantly with lifetime stability. There was a significant positive correlation of lifetime stability with lifetime reproductive success for 34 mares observed, and the correlation was higher when the data of 8 wandering mares (<60% in lifetime stability) were omitted. The mean +/- s.d. delivery interval of 25 stable mares was 364.5 +/- 11.0 days, whereas that of 8 unstable mares and stable mares who changed stallions was 387.0 +/- 40.2 days. There was a significant difference between delivery intervals of stable and unstable mares. Significant correlations between the stability of consort relations and both the foaling rates and delivery intervals suggest that mares may obtain major reproductive advantages if they maintain long term and stable consort relations with a particular stallion throughout their reproductive life span.
为了确定在三崎野马中，种马与母马之间关系的稳定性（配偶关系）与母马繁殖成功率之间是否存在关联，对二者关系的稳定性进行了研究，并测定了产犊间隔的时长。对34匹母马进行了连续5年多的观察。16匹母马的终生配偶关系稳定性为80 - 100%（平均92.4%），10匹母马为60 - 79%（平均70.4%），8匹母马为0 - 59%（平均27.9%）。特定配偶关系的持续时长（年）为2至10年，且发现其与终生稳定性显著相关。对于观察的34匹母马，终生稳定性与终生繁殖成功率存在显著正相关，当剔除8匹游荡母马（终生稳定性<60%）的数据时，这种相关性更高。25匹稳定母马的平均产犊间隔为364.5±11.0天，而8匹不稳定母马以及更换过种马的稳定母马的平均产犊间隔为387.0±40.2天。稳定母马与不稳定母马的产犊间隔存在显著差异。配偶关系稳定性与产驹率和产犊间隔之间的显著相关性表明，如果母马在整个繁殖寿命期内与特定种马保持长期稳定的配偶关系，它们可能会获得主要的繁殖优势。
