The effect of soybean-derived phytoestrogens on concentrations of plasma isoflavones, 15-keto-13,14-dihydroprostaglandin F2alpha and progesterone in dairy cows
2010
Watzkova, J.,Agrovyzkum, Pohorelice (Czech Republic). Oddeleni Vyzivy Zvirat a Kvality Zivocisnych Produktu | Krizova, L.,Agrovyzkum, Pohorelice (Czech Republic). Oddeleni Vyzivy Zvirat a Kvality Zivocisnych Produktu | Pavlik, A.,Mendelova Univ., Brno (Czech Republic). Ustav Morfologie, Fyziologie a Genetiky Zvirat | Schulzova, V.,Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Chemie a Analyzy Potravin | Hajslova, J.,Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Chemie a Analyzy Potravin | Lojza, J.,Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Chemie a Analyzy Potravin
The objective of the study was to determine the effect of soybean-derived phytoestrogens and their metabolites on the activity of sex hormones during the oestrous cycle in multiparous lactating dairy cows. The experiment was carried out on 4 Holstein cows in the form of replicated Latin square in double reversal design. The experiment in the total length of 168 days was divided into 4 periods of 42 days, each consisting of a 21-day preliminary period and a 21-day collecting period. Cows were divided into 2 groups of 2 cows. The control group (C) was fed a diet based on extruded rapeseed cake while the experimental group (S) was fed a diet containing extruded full-fat soya. The intake of total isoflavones was 3,297 mg/d in S and 58.0 mg/d in C (P less than 0.001). The concentrations of individual isoflavones (daidzein, genistein and equol) in plasma were significantly higher in S (49.3, 78.7 and 218.8 ng/mL, respectively) than in C cows (13.5, 42.9 and 18.3 ng/mL, respectively). Plasma concentration of progesterone throughout the oestrous cycle was not influenced. Plasma concentration of prostaglandine PGFM throughout the oestrous cycle in S animals tended to be higher (P = 0.095) than in C cows. No differences in the length of the oestrous cycle between the cows fed different diets were observed.
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