Comparison of Luteinizing Hormone, Leptin and Progensterone Levels in the Systemic Circulation (Vena jugularis) and near the Ovarian Circulation (Vena cava caudalis) during the Oestrous Cycle in Mangalica and Landrace Gilts
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概要
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The objective of this study was to evaluate luteinizing hormone (LH) and luteal progesterone (P4) secretion in systemic blood and blood near the ovaries in Mangalica (M) and Landrace (L) gilts by implanting catheters into the Vena jugularis and the Vena cava caudalis via the Vena saphena, respectively. Furthermore, leptin was analyzed in jugular vein blood. Blood was collected twice daily from day 7 to day 19 of the oestrous cycle and frequently (10-min intervals for 6 h) on day 9, day 12 and day 15 in M (n=3) and L gilts (n=4). L gilts had congruent pulsatile LH secretion in both veins, but the LH concentrations in M were always below the assay sensitivity during the luteal phase. In both breeds, episodic P4 secretion was found in the jugular and caval veins, and both sampling site and breed had an influence on P4 secretion (P<0.05). The mean concentration of P4 was higher (P<0.01) in utero-ovarian blood (75.8 ± 5.3 in M; 49.6 ± 4.2 ng/ml in L) than in the periphery (31.3 ± 2.0 in M; 21.2 ± 1.8 ng/ml in L). M pigs had a lower number of corpora lutea (9.7 ± 2.3 vs. 20.5 ± 4.4), and analysis of the P4 secretion ratio per corpus luteum revealed an influence of breed (P<0.01). This ratio was significantly higher in M (3.8 ± 0.3 and 8.7 ± 0.7 ng/ml) compared with the L gilts (1.4 ± 0.1 and 2.8 ± 0.3 ng/ml) in the jugular and caval veins, respectively. Blood sampling from the Vena cava caudalis is potentially more precise than from the Vena jugularis for evaluation of ovarian P4 secretion. Both the higher P4 concentration and increased leptin secretion (11.3 ± 0.6 vs. 3.0 ± 0.1 ng/ml, P<0.05) and consequently the altered LH secretion pattern in the Mangalica may contribute to the lower fecundity of this breed.
- 日本繁殖生物学会の論文
- 2008-12-01
著者
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RATKY Jozsef
Research Institute for Animal Breeding and Nutrition
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TUCHSCHERER Armin
Research Unit Genetics and Biometry, FBN Research Institute for the Biology of Farm Animals
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Ratky Jozsef
Res. Inst. For Animal Breeding And Nutrition
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Schneider Falk
Research Institute For The Biology Of Farm Animals
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BRUSSOW Klaus-Peter
Research Institute for the Biology of Farm Animals
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EGERSZEGI Istvan
Research Institute for Animal Breeding and Nutrition
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Tuchscherer Armin
Research Institute For The Biology Of Farm Animals
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Tuchscherer Armin
Research Unit Genetics And Biometry Fbn Research Institute For The Biology Of Farm Animals
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Bruessow K‐p
ドイツ国立デュマスドルフ家畜研究所繁殖部
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Bruessow Klaus-peter
ドイツ
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