| Abstract | Ovarian ultrasonography and plasma progesterone levels were monitored in 37 lactating Holstein cows with a history of repeat breeding; the data obtained were analysed in conjunction with clinical and behavioural signs, to identify the aetiology of the syndrome. Differences were detected between RBCs displaying apparently normal cycles and others with irregular cycles. There were also differences in heat expression; a large number of repeat breeder cows (RBCs, 50%) displayed delayed or silent oestrus. Ovarian disorders were common in RBCs, and included ovarian cysts, mistimed AI, subluteal progesterone levels, luteal dysfunction or ovulation defects. Both ultrasonography and plasma progesterone assays are useful tools for ascertaining the aetiology of the repeat breeder syndrome. |
| Authors | C C Pérez-Marín, F España
(Affiliation: Dept. Medicina y Cirugía Animal, Facultad de Veterinaria, Universidad de Córdoba, Córdoba, Spain. pv2pemac at uco.es)
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| Journal | Reproduction in domestic animals = Zuchthygiene
(Reprod Domest Anim)
Vol. 42
Issue 5
Pg. 449-56
(Oct 2007)
ISSN: 0936-6768 Germany |
| PMID | 17845598
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
| Chemical References |
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| Topics |
- Animals
- Breeding
- Cattle
(physiology)
- Cattle Diseases
(blood, etiology)
- Estrus
(physiology)
- Female
- Insemination, Artificial
(veterinary)
- Luteal Phase
(physiology)
- Ovary
(physiology, ultrasonography)
- Ovulation
(physiology)
- Postpartum Period
- Pregnancy
- Progesterone
(blood)
- Reproduction
(physiology)
- Time Factors
|
