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Influence of level of feed intake on the progesterone metabolism in dairy cows

Abstract
The objectives of these studies were to determine the effect of level of feed intake on progesterone clearance rates in dairy cows. Endogenous progesterone (P4) roduction was eliminated by subcutanously implanting a capsule containing a GnRH-agonist (deslorelin) into the ear of each animal 3 weeks before inserting a CIDR device containing 1.9 g P4 into the vagina. Daily plasma samples were assayed for P4. Faecal samples were also taken daily and assayed for pregnanes (FP4M) containing a 20-oxo-, a 20alpha- or a
20beta-OH group with EIAs. Cows were either fed ad libitum or food restricted. In addition the influence of food quality on fecal progesterone excretion was tested. Results show that there was a negative relationship between feed intake (the amount of food consumed) and plasma P4
concentrations. However, concentrations of FP4M were not affected by level of feed intake or fecal output, but daily excretion rate of FP4M was associated with the volume of faeces. In addition, food quality, (high or low dry matter or metabolizable energy) in the diet did not effect the
excretion rates of FP4M metabolites and plasma P4 concentrations.
Coordination for vetmeduni vienna
Schwarzenberger Franz
Coordination in general
Rabiee, A., Macmillam, J.
Universität Melbourne, Victoria, Victoria, Australia
Duration
01.06.99-31.12.01
Type of Research
Basic research
Vetmed Research Units
Institute for Medical Biochemistry
Projekt partner
Contact: Prof.Dr. F. Schwarzenberger
Ludwig Boltzmann Institut für Veterinärmedizinische Endokrinologie, Veterinärplatz 1, A Wien, Austria
Funded by
Dairy Research and Development Corporation, Victoria, Australia
8 Publications

Rabiee, AR; Macmillan, KL; Schwarzenberger, F; Wright, PJ (2002): Effects of level of feeding and progesterone dose on plasma and faecal progesterone in ovariectomised cows. Anim Reprod Sci. 2002; 73(3-4):185-195

Rabiee, AR; Macmillan, KL; Schwarzenberger, F (2002): Plasma, milk and faecal progesterone concentrations during the oestrous cycle of lactating dairy cows with different milk yields. Anim Reprod Sci. 2002; 74(3-4):121-131

Rabiee, AR; Dalley, D; Borman, JM; Macmillan, KL; Schwarzenberger, F (2002): Progesterone clearance rate in lactating dairy cows with two levels of dry matter and metabolisable energy intakes. Anim Reprod Sci. 2002; 72(1-2):11-25

Schwarzenberger, F; Son, CH; Pretting, R; Arbeiter, K (1996): Use of group-specific antibodies to detect fecal progesterone metabolites during the estrous cycle of cows. Theriogenology (46) 23-32.

Rabiee, AR; Macmillan, KL; Schwarzenberger, F (2002): Excretion rate of progesterone in milk and faeces in lactating dairy cows with two levels of milk yield. Reprod Nutr Dev. 2002; 41(4):309-319

Rabiee, A; Macmillan, K; Schwarzenberger, F; Thaller, D; Rathbone, M; Trigg, T (2001): Suppression of ovarian progesterone production in dairy cows using an implant of GnRH-agonist (deslorelin) for the purpose of evaluating progesterone metabolism [corrected]. Aust Vet J. 2001; 79(10):690-694

Rabiee, AR; Macmillan, KL; Schwarzenberger, F (2001): The effect of level of feed intake on progesterone clearance rate by measuring faecal progesterone metabolites in grazing dairy cows. Anim Reprod Sci. 2001; 67(3-4):205-214

Rabiee, AR; Macmillan, KL; Schwarzenberger, F (2001): Progesterone metabolism in ovariectomised non-lactating Holstein-Friesian cows treated with progesterone with two levels of feed intake. Anim Reprod Sci. 2001; 66(1-2):35-46

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