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| 飯島, 由子; 河合, 正人; 早川, 聡; 朝井, 洋; 花田, 正明; IIJIMA, Yuuko; KAWAI, Masahito; HAYAKAWA, Satoshi; ASAI, You; HANADA, Masaaki. |
| ウマの後腸内に水溶性炭水化物(WSC)が大量に流 れ込むと、代謝障害を引き起こす可能性が指摘されて いる。牧草中のWSC含量は乾草などに比べて生草で 高く、また同じ牧草でも季節によって変化することが 知られている。本研究では放牧草中のWSC含量、およ びそれらを採食したウマの後腸内発酵性状の指標とし て糞性状を測定し、季節聞で比較した。調査は日高管 内のサラブレッド種生産農家5戸の繁殖雌馬用放牧地 と、そこで放牧飼養されている繁殖雌馬(のべ98頭) を用い、5、7、9月に行った。放牧草中WSC含量は 7月、9月(13.4、9.3%DM)に比べて5月(19.2%DM) に高かった(p<O.05) 。糞の乳酸濃度は504~729μg/g DMと季節聞で有意な差はなかったが、総VFA濃度は 5月、7月、9月の順に高かった(p<O.05)。糞のpH は7月(6.35)、9月(6.42)に比べて5月(6.08)に低 かった(p<O.05)。放牧草中WSC含量が15%DMを上回 るとき、糞のpHは低下する傾向がみられた。放牧草中 WSC含量が高い春はもちろん、夏、秋においても15% DM程度にまでWSC含量が高くなる場合、ウマの放牧 飼養管理に注意を払う必要があることが示唆された。 It is pointed out the overflow of water-soluble carbohydrates (WSC) into hindgut may cause the metabolic disorders in horses. It is known that the WSC contents in fresh grasses are higher than those in hay，and the... |
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Palavras-chave: 放牧草; 水溶性炭水化物; 糞性状; サラブレッド; Gazing grasses; Water soluble carbohydrates; Fecal characteristics; Thoroughbred. |
| Ano: 2010 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2685 |
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| ISHII, Mitsuo; AOKI, Takahiro; YAMAKAWA, Kazuhiro; MAGATA, Fumie; GOJO, Chikara; ITO, Katsumi; KAYANO, Mitsunori; NAMBO, Yasuo; 石井, 三都夫. |
| The aim of this study was to clarify the relationship between the placental retention time (PRT) and the reproductive performance following mating at the foal heat in Thoroughbreds. For this purpose, we interviewed 292 farmers over a period of 3 years with questionnaires evaluating foaling, expulsion of placenta and reproductive performance at the foal heat in 1,432 mares. The obtained data were later compared with a previous study of heavy draft mares. The average of the PRT of the 1,432 Thoroughbred mares was 58 ± 88 min (mean ± SD). The mean PRT of Thoroughbreds was significantly shorter than that of the148 min of heavy draft mares. The incidences of retained placenta (RP) occurring in the Thoroughbred mares were 5.2 and 4.0%, for over 3 and 4 hr after... |
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Palavras-chave: Foaling; Heavy draft; Placental retention time; Reproductive performance; Thoroughbred. |
| Ano: 2013 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3844 |
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| Maynard, Leigh J.; Stoeppel, Kelly M.. |
| Thoroughbred broodmares are the foundation of a successful racing operation. This study estimated the impact of breeding, racing, and market characteristics on broodmare auction prices. Data represent 604 in-foal broodmares sold in Keeneland’s 2005 sale. Prices were highly responsive to the sire’s stud fee, the broodmare’s age, and progeny performance in graded stakes races, with pronounced day-of-sale effects. The stud fee marginal value was substantially lower than one break-even estimate, suggesting possible disincentives for investment in stallion services. Out-of-sample forecasts were far superior to naïve forecasts but were not accurate enough to use in isolation from other decision aids. |
| Tipo: Journal Article |
Palavras-chave: Broodmare; Forecasting; Hedonic price analysis; Thoroughbred; Agribusiness; Livestock Production/Industries. |
| Ano: 2007 |
URL: http://purl.umn.edu/62295 |
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| Neibergs, J. Shannon; Thalheimer, Richard. |
| Thoroughbred incentive programs are subsidy policies funded from state parimutuel tax revenue designed to promote regional race horse breeding and ownership. At issue is an ongoing debate concerning the effectiveness of alternative policies. Empirical results indicate that incentive programs have a positive economic effect, but gains to Thoroughbred breeders can be obtained by reallocating tax revenue to non-restricted purses. A policy allocating tax revenue ton non-restricted purses shifts yearling demand and increases prices, while breeder subsidies shift only the supply function and therefore lower prices. Consequently, breeder revenues increase in response to a policy that favors non-restricted purses over subsidies. |
| Tipo: Journal Article |
Palavras-chave: Incentive programs; Parimutual horse racing; Subsidy; Tax; Thoroughbred; Agricultural and Food Policy. |
| Ano: 1999 |
URL: http://purl.umn.edu/15157 |
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| Vinzant, Patrick L.; Neibergs, J. Shannon. |
| Thoroughbred racehorses are commonly characterized as unprofitable investments. Previous studies, grouping all racehorses together, estimate that over 80% of all racehorses in training fail to earn enough to recover the variable costs of training. However, these studies are not truly representative, because they fail to account for a number of factors affecting profitability. This study estimates expected purse earnings and profitability of claiming horses in Kentucky. Maximum-likelihood estimates of probability distribution parameters show that expected purse earnings follow an exponential distribution with a mean of $25,267. Profitability is best described by a Gamma distribution with a mean of $4,824. Of the 305 claims analyzed for profitability,... |
| Tipo: Journal Article |
Palavras-chave: Claiming horses; Financial risk; Maximum likelihood; Probability; Profitability; Thoroughbred; Agribusiness. |
| Ano: 1999 |
URL: http://purl.umn.edu/14682 |
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