Luteal phase deficiency as a possible cause of repeat breeding in dairy cows |
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| Authors: | M Kimura T Nakao M Moriyoshi K Kawata |
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| Affiliation: | 1. INRA, UMR7247, Physiologie de la Reproduction et des Comportements, INRA, CNRS, Université de Tours, Haras Nationaux, Nouzilly, France;2. Laboratory of Physiology and Control of Reproduction, Veterinary School, State University of Ceará, Fortaleza, CE, Brazil;3. Museum National d''Histoire Naturelle, Réserve de la Haute Touche, Obterre, France;4. Laboratory of Endocrinology, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium;1. Department of Surgery, Anaesthesiology and Radiology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt;2. Department of Surgery, Faculty of Veterinary Medicine, Benha University, Benha, Egypt;1. Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA;2. Texas A&M AgriLife Research, Amarillo, Texas, USA;3. Aurora Organic Dairy, Cold Water Farm, Stratford, Texas, USA;1. Department of Animal Production, Faculty of Agriculture, Alexandria University, Alexandria 21545, Egypt;2. Department of Arid Land Agriculture, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia;1. Embrapa Semiárido, BR 428, Km 152, Caixa Postal 23, CEP 56302-970, Petrolina, PE, Brazil;2. College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia;3. Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa |
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| Abstract: | ![]()
The incidence of luteal phase dysfunction as indicated by milk progesterone profiles after artificial insemination (AI) and ovulation was investigated in 21 repeat-breeding dairy cows. Eight (38%) cows had a normal progesterone profile; progesterone levels in skim milk rose to 1·0 ng/ml or higher within five days after insemination (0 dayday of AI) and, thereafter, steadily increased to 2·0 ng/ml or higher at mid-luteal phase. Another 13 (62%) cows had an abnormal pattern of milk progesterone levels which indicated luteal phase defects after AI; seven (54%) of the 13 cows showed a delayed rise of the progesterone level until 6–11 days after AI, two (15%) had a comparatively low level of milk progesterone below 2·0 ng/ml through most of the luteal phase, and four (31%) had a combined pattern of a delayed rise and a low level of milk progesterone during luteal phase. After the AI, five (63%) of the eight cows with a normal progesterone profile conceived, while none of the 13 cows which had insufficient luteal function conceived. It is suggested that delayed formation of the corpus luteum, either combined or not combined with lowered secretion of progesterone during luteal phase is one of the causes of repeat breeding in dairy cows. |
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