Concentrations of Oestradiol-17 β and Progesterone in Plasma and Defatted Milk of Cattle During the Oestrous Cycle

Glencross, R.G.; Abeywardene, S.A.

doi:10.1016/s0007-1935(17)30590-0

Cited by 14 publications

(9 citation statements)

References 11 publications

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“…During the normal oestrous cycle in the cow, oestra¬ diol-17ß in milk and plasma follow the same pattern (Glencross & Abeywardene, 1983). The object of the 3 4…”

Section: Discussionmentioning

confidence: 95%

“…Concentrations of 55-1, 15-4 and 95-7 pmol/1 for oestradiol-17ß in plasma, in defatted milk and for total oestradiol-17ß in defatted milk re¬ spectively have been reported in non-stimulated cows at the time of the preovulatory peak by Glencross & Abeywardene (1983) . In the present experiment, in the cow with the lowest response (one ovulation) the corresponding values were 35-2, 13-6 and 169-6 pmol/1, indicating that the treatment by itself did not modify oestradiol-17ß secre¬ tion.…”

Section: Discussionmentioning

confidence: 96%

“…Few data, however, on the pattern of secretion of oestradiol-17ß are available and those that are deal only with changes in concentration during the oestrous cycle McDonald, Sauer, Watson & Foulkes, 1982;Glencross & Abeywardene, 1983). During treatment to induce superovulation oestradiol-17ß concentra¬ tions in plasma have been shown to be related to the number of follicles that will ovulate (Lemon & Saumande, 1972;Henricks, Hill, Dickey & Lamond, 1973; Saumande & Pelletier, 1975;Henricks & Hill, 1978;Saumande, 1978).…”

Section: Introductionmentioning

confidence: 99%

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Superovulation in the cow: comparison of oestradiol-17β and progesterone patterns in plasma and milk of cows induced to superovulate; relationships with ovarian responses

Saumande¹,

Batra²

1985

Journal of Endocrinology

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Free oestradiol-17 beta, free + conjugated oestradiol-17 beta (total oestradiol-17 beta) and progesterone in milk, and free oestradiol-17 beta and progesterone in plasma were measured in 16 cyclic cows injected with FSH to induce superovulation during the treatment and periovulatory periods. The patterns of steroid secretion were the same in milk as in plasma but at different concentrations. Among oestrogens, the highest concentrations were measured for total oestradiol-17 beta in milk, followed by free oestradiol in plasma and free oestradiol in milk. Progesterone concentrations in milk were higher than in plasma. The peak concentrations of oestrogens were related to ovulation rate: Spearman Rank Correlation coefficient (r.s.) = 0.87 (P less than 0.001), 0.78 (P less than 0.001) and 0.69 (P less than 0.001) for total oestradiol, free oestradiol in milk and free oestradiol in plasma respectively. The increase in progesterone concentrations in milk between the beginning of treatment and prostaglandin injection was negatively correlated with the percentage of viable embryos among those recovered (r.s. = -0.68; P less than 0.001). This was not observed for progesterone in plasma. These results therefore show that the steroid pattern in milk gives a better indication as to the ovarian response to a superovulatory treatment than does the steroid pattern in plasma. In addition the fact that milk samples are easier to obtain and handle than blood plasma have led us to conclude that, to follow the effect of gonadotrophin stimulation, it would be more informative to assay oestradiol-17 beta and progesterone in milk rather than in plasma.

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“…During the normal oestrous cycle in the cow, oestra¬ diol-17ß in milk and plasma follow the same pattern (Glencross & Abeywardene, 1983). The object of the 3 4…”

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Superovulation in the cow: comparison of oestradiol-17β and progesterone patterns in plasma and milk of cows induced to superovulate; relationships with ovarian responses

Saumande¹,

Batra²

1985

Journal of Endocrinology

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“…Values in the luteal phase of 10-15 pg/ml, and at oestrus of 31-34 ± 1-70 pg/ml, in Murrah buffaloes (Batra & Pandey, 1982) compare with the lower values of 2-9pg/ml and 90-130pg/ml respectively for swamp buffaloes (Kanai & Shimizu, 1984;Avenell, Saepudin & Fletcher, 1985), and 1-6 pg/ml and 10-15 pg/ml respectively in cows (Dobson & Dean, 1974;Glencross & Pope, 1981 (Batra & Pandey, 1982) compared to lower values of 15 pg/ml and 36 pg/ml at respective stages in cows (Pandey, Pahwa, Suri & Batra, 1981). This may reflect the higher fat content of buffalo milk (Kay, 1974) as 65% of milk oestradiol is located in the lipid phase (Wolford & Argoudelis, 1970) and analyses on defatted cow milk have revealed very similar concentrations to those in plasma (Glencross & Abeywardene, 1983).…”

Section: Pubertymentioning

confidence: 90%

A review of female cattle reproduction with special reference to a comparison between buffaloes, cows and zebu

Dobson¹,

Kamonpatana²

1986

Reproduction

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“…The phylogenetic origin of steroidal oestrogens remains unclear. Data on the physiological concentrations of oestradiol in cartilaginous fish, in acraniata and in invertebrates are very s 394 (1982); Glencross and Abeywardene (1983); Abeywardene et al (1984); Gyawu andPope (1990) Roy et al (1985); Watson and MacDonald (1984) Saumande and Batra (1984) Monk et al (1975) Erb et al (1977) Monk et al (1975) Gyawu and Pope (1983) Abeywardene and Pope (1990) Batra er al. (1980) sparse, and the importance of oestrogens in molluscs (e.g.…”

Section: Pork Poultry Jish and Eggsmentioning

confidence: 99%

Possible health impact of animal oestrogens in food

Daxenberger¹

2001

Human Reproduction Update

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Oestrogens govern reproductive functions in vertebrates, and are present in all animal tissues. The theoretical maximum daily intake (TMDI) of oestradiol-17beta by consumption of cattle meat is calculated to be 4.3 ng. Following the use of oestradiol-containing growth-promoting agents, TMDI is increased by a factor of 4.6 to 20 ng oestradiol-17beta, assuming that single dosage and 'good animal husbandry' are observed. Pork and poultry probably contain similar amounts of oestrogens as untreated cattle. The mean concentration of oestradiol-17beta in whole milk is estimated at 6.4 pg/ml. Scarce data available on eggs report up to 200 pg/g oestradiol-17beta. The risk evaluation of oestrogenic growth-promoting agents is limited by analytical uncertainties. Residues of oestradiol-17alpha and the importance of oestrogen conjugates are widely unknown. The performance of mass spectrometry still needs to be improved for confirmation of oestrogen concentrations in most food. At present, the potential relevance of oestradiol acyl esters, the actual daily production rate of oestradiol in prepubertal children, and the role of oestradiol metabolites in cancer are obscure. The presence of different cytoplasmic oestrogen receptor subtypes and potential oestradiol effects in non-reproductive functions require further examination.

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Concentrations of Oestradiol-17 β and Progesterone in Plasma and Defatted Milk of Cattle During the Oestrous Cycle

Cited by 14 publications

References 11 publications

Superovulation in the cow: comparison of oestradiol-17β and progesterone patterns in plasma and milk of cows induced to superovulate; relationships with ovarian responses

Superovulation in the cow: comparison of oestradiol-17β and progesterone patterns in plasma and milk of cows induced to superovulate; relationships with ovarian responses

A review of female cattle reproduction with special reference to a comparison between buffaloes, cows and zebu

Possible health impact of animal oestrogens in food

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