肯塔基州中部 2004 配种季节的纯种母马繁殖性能指标。

Reproductive performance measures among Thoroughbred mares in central Kentucky, during the 2004 mating season.

机构信息

Maxwell H. Cluck Equine Research Center, Department of Veterinary Sciences, University of Kentucky, Lexington, Kentucky 40506, USA.

出版信息

Equine Vet J. 2009 Dec;41(9):883-8. doi: 10.2746/042516409x456068.

DOI:10.2746/042516409x456068

PMID:20383986

Abstract

REASON FOR PERFORMING STUDY

To improve efficiency at the farm level, a better understanding of how farm management factors impact reproductive performance is important.

OBJECTIVE

To assess reproductive efficiency and effectiveness among Thoroughbred mares in central Kentucky.

METHODS

A cohort of 1011 mares on 13 farms in central Kentucky was followed during the 2004 mating and 2005 foaling season. Information on farm level practices was collected via interviews with farm managers. Reproductive records were collected for each mare mated to obtain information on mare characteristics. The influence of mare age and status (maiden, foaling, barren) on Days 15 and 40 post mating pregnancy rates, foaling rates and total effective length of the mating season were assessed. The influence of stallion book size on reproductive performance measures was also examined.

RESULTS

Per season pregnancy rates on Days 15 and 40 post mating and live foal rate were 92.1, 89.3 and 783%, respectively. Per cycle rates for the same time periods were 64.0, 583 and 50.8%. There were no significant associations between stallion book size and reproductive performance outcomes. The mean +/- s.d. interval from the beginning of the mating season to the last mating of the mare was 36.5 +/- 26.1 days.

CONCLUSIONS

Mare age had a significant impact on efficiency of becoming pregnant, maintaining pregnancy and producing a live foal. Overall, fertility did not decrease among stallions with the largest book sizes. Total interval length of the mating season can be reduced if managers ensure maiden and barren mares are mated at the beginning of the season and foaling mares are mated at the earliest oestrus after acceptable uterine involution has been achieved.

POTENTIAL RELEVANCE

Measures identified in the study can be used by owners, farm managers and veterinarians to improve mare reproductive performance and identify parameters to assist with the implementation of effective culling practices.

摘要

研究目的

为了提高农场的效率，深入了解农场管理因素如何影响繁殖性能非常重要。

研究目的

评估肯塔基州中部地区的纯种母马的繁殖效率和效果。

研究方法

在 2004 年配种和 2005 年产驹季节，对肯塔基州中部 13 个农场的 1011 匹母马进行了队列研究。通过与农场经理面谈收集了农场管理实践方面的信息。为了获得每匹母马的配种信息，收集了繁殖记录。评估母马年龄和状态（初配、产驹、空怀）对配种后第 15 天和第 40 天妊娠率、产驹率和配种季节总有效长度的影响。还检查了种马书册大小对繁殖性能指标的影响。