ホルスタイン種乳牛における母体血漿中プロジェステロンおよびエストロンサルフェート濃度と難産との関係

概要

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Thirteen primiparous and 41 multiparous Holstein-Friesian cattle were used to study the relationship between maternal plasma progesterone (P_4) and estrone sulfate (E_1S) concentrations and the prevalence of dystocia. The calvings in 4 heifers and 30 cows were normal (eutocia), while the calvings in 9 heifers and 11 cows were difficult (dystocia). Neither the concentrations of P_4 nor E_1S were different between the groups with eutocia and dystocia from days 90 to 270 of pregnancy. However, a few days prior to parturition, eutocial cows and heifers showed a sharp decline of plasma P_4, while dystocial cattle did not show such a remarkable decline of P_4 concentration. Plasma P_4 levels in dystocial cows a few days antepartum were significantly higher than in eutocial animals (P < 0.05 or P < 0.01). Prepartum E_1S concentrations were significantly lower (P < 0.05) in dystocial than eutocial cattle during the prepartum period from days 6 to 1 in heifers and from days 3 to 1 in cows. These results suggest that insufficient production of E_1S and delayed regression of the corpora lutea are possible causes of dystocia in cattle.
社団法人日本獣医学会の論文
1999-08-25