Feeding soybean meal increases the blood level of isoflavones and reduces the steroidogenic capacity in bovine corpora lutea,without affecting peripheral progesterone concentrations |
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| Institution: | 1. Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium;2. Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium;3. Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium;4. Laboratory of Pharmacognosy and Phytochemistry, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium;5. Department of Veterinary Sciences, Campus Drie Eiken, Antwerp University, Universiteitsplein 1, 2610 Wilrijk, Belgium;1. Department of Animal Physiology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-719 Olsztyn, Poland;2. Research and Educational Center, Laboratory of Molecular Diagnostics, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland;1. Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000, College Street, Sherbrooke, QC, Canada J1M OC3;2. Departamento de Zootecnia, Universidade Estadual de Maringa, Maringa, PR, Brazil;1. Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia;2. Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia;1. Bioforsk-Norwegian Institute for Agricultural and Environmental Research, Organic Food and Farming Division, N-6630 Tingvoll, Norway;2. Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, N-1432 Ås, Norway;3. Department of Animal Science, Aarhus University, DK-8830 Tjele, Denmark;4. Department of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden |
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| Abstract: | Thirty-three Holstein-Friesian cows were followed from 14 days pre partum until the fourth ovulation post partum. Housing conditions and basic ration were identical for all animals. Concentrates were individually supplemented according to the daily milk production level, using two different types of protein rich concentrates: soybean meal and rapeseed meal. Soybean and rapeseed meal are known to be respectively high and low in isoflavones. Cows were randomly divided into three groups and blocked for parity. Group I (n = 11) was supplemented with soybean meal and acted as control group. Groups II (n = 11) and III (n = 11) were respectively supplemented with soybean and rapeseed meal and were subjected to a biopsy sampling of the corpus luteum at day 9 of the first three postpartal estrous cycles.Soybean meal supplementation to lactating dairy cows (1.72 kg on average) induced an increase in the blood concentration of equol, dihydrodaidzein, o-desmethylangolensin in both soy groups and resulted in a reduced area occupied by steroidogenic (P = 0.012) and endothelial cells (P = 0.0007) in the luteal biopsies. Blood concentrations of equol and glycitein were negatively correlated with the areas occupied by steroidogenic (r = ?0.410 with P = 0.0002, respectively r = ?0.351 with P = 0.008) and endothelial cells (r = ?0.337 with P = 0.01, respectively r = ?0.233 with P = 0.085) in the 3 first estrous cycles. The latter however did not affect the diestrous peripheral blood progesterone concentration. |
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| Keywords: | Dairy cow Soy bean meal Isoflavones Corpus luteum Progesterone |
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