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  foaling
Higher foaling rates among dominant mares on Assateague Island could therefore be the result of rank-related mate choice by stallions and direct female competition for mating opportunities.
      
A thoroughbred mare has suffered a recto-vestibular injury during an assisted foaling.
      
Calcium carbonate content in pre-foaling mammary secretions and induction of foaling.
      
During the year, there were six foaling, four in Marwari and two in Kathiawari.
      
Infectious diarrhoea is known to pose a challenge to the equine breeders during each foaling season.
      
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  foal
Fitness of dominant mares, however, was significantly higher than that of subordinates, the latter having a higher foal mortality, part of which could be attributable to dominants' aggression.
      
The mechanism leading to biases in the birth sex ratio could have been the loss of male embryos by mares that did not foal.
      
As there was no evidence for selective abortion of male foetuses in females that did foal the next year, it is not necessary to invoke maternal adjustment, though this remains a possibility.
      
Total maternal input by older mothers did not seem to be any greater, but was better targeted at the most critical period for foal survival and a similar pattern was observed in mares that had lost a foal in the previous year.
      
In addition, older mothers were more likely to foal in consecutive years, supporting the hypothesis that they are investing less than younger mares in individual offspring.
      
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Hequ horse is a famous native horse variety in China. Its habitat environmenthad effect on its formation. The relationshipbetween some exophenotype charactersand the habitat environmentwasdiscussed in this paper. Under the habitat conditionsof higher altitude (3300~4000m) with lower oxygen content and harshclimate (annual medial temperature 0.3~1.4℃), the data of Hequ horse's major body measurement values were higher than those of that of other native horse varieties. It had formed the characters of larger body...

Hequ horse is a famous native horse variety in China. Its habitat environmenthad effect on its formation. The relationshipbetween some exophenotype charactersand the habitat environmentwasdiscussed in this paper. Under the habitat conditionsof higher altitude (3300~4000m) with lower oxygen content and harshclimate (annual medial temperature 0.3~1.4℃), the data of Hequ horse's major body measurement values were higher than those of that of other native horse varieties. It had formed the characters of larger body and bigger chest.In the native population, the proportion of individual with dark hair ( bay, black, blue roan and chestnut ) was 97.6%, with dark skin ( black and brown ) was 91.6%, these gave the horse having protective adaptation from strong ultraviolet ray on the tableland. The birth time of Hequ horse foal was consistence with the time of warming climate and growing grass. In the period of June to August, the land had the most high temperature and precipitation in a year, and had the conditionsof growing grasses rapidly, this contributed to the mare sufficient nutrient for reproduction recovery, lactation, and growing foal.

结合河曲马体尺、被毛和皮肤颜色等外部特征分析表明 ,在寒冷及氧气稀薄环境条件影响下 ,河曲马品种各项体尺指标和胸围率比我国其它地方马品种大 ,具有体格高大、胸宽深的特征。骝、黑、青、栗色等深颜色被毛占97.6 % ,自然群体中以青毛马的比例较高 ,黑色和褐色皮肤占 91.6 % ,深色皮肤和深色被毛是抵御高海拔环境下强紫外线照射的适应性表现。河曲马母马产驹主要集中在 5~ 6月 ,此期间牧草生长旺盛 ,母马可以得到较充足的营养供给 ,以满足产后恢复体况和哺乳马驹。母马较好的繁殖性能、初生马驹早期生长发育较快等特征均与产区气候和植被生长条件变化有良好适应

The data and investigating result of genetic resource of Licuan horse in the passed decades were analyzed in this paper,the genetic resource of Licuan horse in Hubei province was analyzed with the indexes of the threatened situation and effective population size.The result showed that the amount of Licuan horse was tending to descend in 1970s,the inbreeding phenomenon was heavy,the effective population size of all Licuan horse was descending every year, Licuan horse was potentially endangered, it was close...

The data and investigating result of genetic resource of Licuan horse in the passed decades were analyzed in this paper,the genetic resource of Licuan horse in Hubei province was analyzed with the indexes of the threatened situation and effective population size.The result showed that the amount of Licuan horse was tending to descend in 1970s,the inbreeding phenomenon was heavy,the effective population size of all Licuan horse was descending every year, Licuan horse was potentially endangered, it was close to endanger minimally.View the situation as a whole, the body measurement and weigth are improving constantly in recent years, the numeber of foal is tending to descend.

对利川马的品种资源近几十年来的资料和调查的结果进行分析,用地方品种资源受威胁的程度和群体的有效大小等指标分析了利川马资源的受威胁程度。结果表明:利川马存栏数量在上世纪 70 年代以后呈逐渐下降的趋势;利川马的有效群体大小正在逐渐下降,处于潜在威胁中,也正接近最低威胁;整体上看,体尺、体重近几年不断提高,利川马产驹数有下降的趋势。

 
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