Mammary Transfer of Hormones and Constituents into Secretions when Cows Were Milked or Secretions Were Sampled Prepartum

Keller, H.; Chew, Boon P.; Erb, R.E.; Malven, P.V.

doi:10.3168/jds.s0022-0302(77)83901-5

Cited by 32 publications

(13 citation statements)

References 35 publications

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“…The very high concentration of prolactin in milk compared to that in plasma during the first 2 days post partum, confirms observations in cattle (Keller et al, 1977;Schams and Schmidt-Polex, 1978). The similar concentration in milk and in plasma 2 days later may be due to the fact that mammary transfer of prolactin from plasma to udder secretion becomes less efficient as the composition of the secretion becomes more characteristic of that of milk (Keller et al, 1977).…”

Section: Discussionsupporting

confidence: 86%

Hormonal changes in post-partum blood plasma and milk of buffaloes (Bubalus bubalis)

Pahwa

Pandey

1983

Anim. Sci.

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Post-partum changes in the concentration of progesterone, oestradiol-17/3 and prolactin were measured by radioimmunoassay in the blood plasma and milk of 28 buffaloes. The mean concentration of progesterone in the plasma of normal animals was 0-24 ± 0-04 /u.g/1 on the day of calving and decreased linearly during the post-partum period, until the complete regression of the residual corpus luteum of pregnancy occurred, when the plasma concentration was recorded as 0-05 to 0-08 /xg/\. The concentration at a silent oestrus was 0-17 ± 0-02 /u.g/1. The milk progesterone profile was parallel to that of plasma but the level was 2 to 4 times higher.The mean concentration of oestradiol-17/3 in plasma was 41-0 ± 2-34 ng/1 on the day of calving; it declined significantly by day 1 post partum (P < 0-001) and fluctuated between 8 and 16 ng/1 until oestrus, when the concentration was approximately 25 ng/1. The oestradiol-17/3 concentration in milk was significantly higher than that of plasma on the day of calving. During the first 20 days post partum, a similar concentration of oestradiol-17/3 was maintained in both fluids but thereafter the concentration in milk was 2 to 3 times that of plasma.The mean concentration of prolactin in plasma was 212-6 ± 19-08 /ug/1 on the day of calving and then declined and fluctuated between 70 and 270 ptg/1 during the rest of the period. A minor elevation occurred around oestrus. The prolactin concentration for the first 2 days post partum in milk was significantly higher than that in plasma but during the rest of the period it was similar to that in plasma.The progesterone concentrations were slightly lower in anoestrous animals than in those cycling. The concentration of prolactin was significantly higher in multiparous animals (P < 0-001), whilst the progesterone and oestradiol values were similar in primiparous and multiparous animals.

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Section: Discussionsupporting

confidence: 86%

Hormonal changes in post-partum blood plasma and milk of buffaloes (Bubalus bubalis)

Pahwa

Pandey

1983

Anim. Sci.

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“…In previous studies, prepartum colostrum mass was markedly lower (around 30% compared with the present study; Brandon and Lascelles, 1975;Keller et al, 1977) compared with the results presented here. Selection for higher milk yields over the last decades makes it difficult to dry off modern dairy cows by abrupt first milking at 4 h postcalving, n = 11).…”

Section: Discussionsupporting

confidence: 69%

“…in the APM secretions supports this concept. However, if milking before parturition is performed only once and close to the time of parturition, as in the present study, it appears that the stimulating effects on copious milk production in the mammary gland are minimized and are not a strong milk secretion stimulus (Keller et al, 1977). This is evidenced by the continued appearance of IgG in the p.p.…”

Section: Discussionmentioning

confidence: 43%

“…Milking before parturition is potentially a means of gaining greater IgG concentration and avoiding dilution effects through increased milk secretion (Brandon and Lascelles, 1975;Keller et al, 1977;Greene et al, 1988). In previous studies, half or whole udders of cows or goats were milked prepartum continuously until parturition, which was shown to induce a PRL response in some of the animals, resulting in the initiation of premature lactogenesis (Guy et al, 1994b).…”

Section: Introductionmentioning

confidence: 99%

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Peripartal progesterone and prolactin have little effect on the rapid transport of immunoglobulin G into colostrum of dairy cows

Gross

Kessler

Bjerre-Harpøth

et al. 2014

Journal of Dairy Science

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Colostrum formation and lactogenesis in the mammary gland and the timing of parturition are regulated by endocrine signals. Changes in progesterone (P4) and prolactin (PRL) are considered key events that inhibit colostrum formation, trigger parturition, and signal the onset of lactation. The goal of our study was to determine if colostrum yield and composition and immunoglobulin transfer are affected by prepartum milking relative to the decrease in P4, peak of PRL, or occurrence of parturition. Twenty-three multiparous cows were randomly assigned to 1 of 2 groups: (1) control with first milking at 4 h postcalving (CON, n = 11), and (2) treatment group with first milking approximately 1 d before calving and second milking at 4 h after parturition (APM, n = 12). Colostrum yields were recorded and proportional samples were analyzed for immunoglobulin G (IgG) concentration. Blood plasma samples for the analyses of P4 and PRL were collected 3 times daily at 8-h intervals for 4 d prepartum and again taken at 4 h after parturition. Total colostrum mass of APM cows was higher than that of CON cows. Immunoglobulin G concentration and protein content did not differ between antepartum milking in APM cows and postpartum milking in CON cows. Colostrum IgG concentration and protein content in APM cows at the postpartum milking were lower compared with the IgG concentration established at the prepartum (APM) and postpartum milkings of CON cows. Immunoglobulin G mass did not differ in first and second colostrum collection in APM cows but was lower compared with that of CON cows. The sum of IgG mass in APM cows (prepartum + postpartum collections) did not differ from that of CON cows. Lactose and fat in milk (concentration and mass) increased from first to second milking in APM cows. Total mass of lactose and fat in APM cows (prepartum + postpartum collections) was greater compared with that of CON cows. The finding that the time of milking relative to parturition, P4 decrease, and PRL peak slightly affected yield and quality of colostrum emphasizes the complex interactions of numerous endocrine and morphological changes occurring during colostrogenesis and lactogenesis in dairy cows. The considerably rapid transfer of immunoglobulins into colostrum of prepartum-milked cows within a few hours leads to the hypothesis that the transfer of IgG can be very fast and-contrary to earlier findings-persist at least until parturition.

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“…Le colostrum contient des concentrations de prolactine (152 ng-ml.>') et de progestérone (2,6 ng-ml. : ') trois fois plus élevées que dans le lait [57]. Les [100,102].…”

Section: Hormonesunclassified

Le colostrum, un lait particulièrement riche en de nombreux composants : peut-on en déceler la présence dans les livraisons de lait de vache ?

Levieux¹

1999

Lait

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Mammary Transfer of Hormones and Constituents into Secretions when Cows Were Milked or Secretions Were Sampled Prepartum

Cited by 32 publications

References 35 publications

Hormonal changes in post-partum blood plasma and milk of buffaloes (Bubalus bubalis)

Hormonal changes in post-partum blood plasma and milk of buffaloes (Bubalus bubalis)

Peripartal progesterone and prolactin have little effect on the rapid transport of immunoglobulin G into colostrum of dairy cows

Le colostrum, un lait particulièrement riche en de nombreux composants : peut-on en déceler la présence dans les livraisons de lait de vache ?

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