The Importance of Prolactin and the Milking Stimulus in the Artificial Induction of Lactation in Cows

Peel, CJ; Taylor, John C; Robinson, IB; McGowan, AA; Hooley, RD; Findlay, J. K.

doi:10.1071/bi9780187

Cited by 20 publications

(20 citation statements)

References 11 publications

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“…In previous work (Peel et al 1978) induced milk yields in the ll-week period (weeks 5-15) of cows and heifers were significantly correlated to total induced milk yields (r = 0·92, n = 33). Based on this finding, differences between groups were determined using the 11 weeks from week 5 to week 15, which then allowed the cows to be utilized in other experiments after week 15.…”

Section: Discussionmentioning

confidence: 99%

“…Mean yields of induced milk, expressed as a percentage of the previous parturient milk yields, were 64±3 % (n = 12) for cows treated with reserpine on days 8, 10, 12 and 14 (experiments 2 and 3) and 57±5% (n = 18) for cows given the high oestrogen-progesterone treatment alone (P<O·I) (Peel et al 1978).…”

Section: Level Of Milk Productionmentioning

confidence: 99%

“…We have previously defined lactogenesis as the period when the lactose content of the mammary secretion increases at a rate greater than 0·5 % per day (Peel et al 1978). The lactose content of these mammary secretions was estimated from glucose release following acid hydrolysis (Cowie et al 1969).…”

Section: Chemical Analysismentioning

confidence: 99%

“…However, reports on the effects of prolactin stimulators such as reserpine and thyrotrophin releasing hormone during the treatment period upon subsequent induced milk yields are conflicting (Mose et al 1975;Collier et al 1977;Peel et al 1978).…”

Section: Introductionmentioning

confidence: 99%

“…A practical disadvantage of the oestradiol-I 7 f3 (0·1 mg/kg body weight daily) and progesterone (0·25 mg/kg body weight daily) treatment which is normally used is that these high levels of oestrogens can cause intense oestrous activity which, together with relaxed ligaments, results in physical injuries such as fractured pelves in some cows (Peel et al 1978). When above-average induced milk yields were associated with plasma hormone levels (Erb et al 1976) it was concluded that the oestradiol-I 7 f3 dose rate could probably be reduced by one-half with no deleterious effect upon milk yields.…”

Section: Introductionmentioning

confidence: 99%

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The Use of Oestrogen, Progesterone and Reserpine in the Artificial Induction of Lactation in Cattle

Peel¹,

Taylor²,

Robinson³

et al. 1979

Aust. Jnl. Of Bio. Sci.

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Oestradiol-17 p, progesterone and reserpine were utilized in three experiments in an attempt to improve the success rate and the magnitude of hormonally induced lactations. Onset of lactogenesis induced by steroid administration was measured by a surge in the lactose content of the mammary secretion and lactations were regarded as being successfully induced if milk yields exceeded 3 kg/day.In all experiments, the dose rate of oestradiol-17 p was standardized at the reduced level of 20 mg/day (approximately 0·05 mg/kg body weight daily), and progesterone maintained at 100 mg/day (approximately 0·25 mg/kg body weight daily) for the initial 7 days (days 1-7). The halving of the dose rate of oestradiol-17 p from the commonly used 0·1 mg/kg body weight daily eliminated the occurrence of noticeable physical injuries in the 60 animals so treated.Induced milk yields were not improved by either repeating the standard ovarian steroid treatment on days 16-22, extending the standard treatment for days 8-21 or continuing the steroid treatment at one-quarter the standard rate for days 8-21.Addition of reserpine to an oestradiol-17 p-progesterone treatment does improve the success rate of the hormonal induction of lactation. In experiment 1, 86% (n = 14) of heifers receiving reserpine were successfully induced into lactation compared to 45 % (n = 15) which were not.In experiments 2 and 3, 95 % (n = 19) of cows receiving both ovarian steroids and reserpine were successfully induced into lactation. However, when we consider only the milk yields of those cows sucessfully induced into lactation, reserpine (3 mg/day) administration on days 1, 6, 11, 16, 21 and 22-28, on days 22-28 alone, or on days 8, 10, 12 and 14 did not enhance induced yields.In one experiment all eleven cows failed to be induced into lactation and this was attributed to an inadequate dry period (25-43 days).

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Section: Discussionmentioning

confidence: 99%

Section: Level Of Milk Productionmentioning

confidence: 99%

Section: Chemical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Use of Oestrogen, Progesterone and Reserpine in the Artificial Induction of Lactation in Cattle

Peel¹,

Taylor²,

Robinson³

et al. 1979

Aust. Jnl. Of Bio. Sci.

Self Cite

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Growth and Development of the Mammary Gland

Cowie

Forsyth

Hart

1980

Hormonal Control of Lactation

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Effect of lactation induction on milk production and composition, oxidative and antioxidant status, and biochemical variables

et al. 2016

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This study aimed to induce lactation in Lacaune sheep and to verify its influence on milk production and composition, oxidative/antioxidant profile, and biochemical variables in serum and milk. A group of ewes (group A, n = 7) was induced with estradiol (0.5 mg/kg body weight (BW)) and progesterone (1.25 mg/kg BW) on days 1 to 7, bovine somatotropin (BST; 250 mg/animal) on days 11 and 40, as well as dexamethasone (16 mg/day) on days 19, 20, and 21. For comparison, another group of pregnant ewes was used as control (group B, n = 5). Blood and milk samples were collected for biochemical analysis, oxidative/antioxidant profile analysis, and determination of individual volume and chemical composition. The hormonal protocol was effective to induce lactation; however, milk production was 79 % lower than the control group. Milk fat, protein, and total solids were significantly lower (p < 0.05) in group A when compared to group B. Hormonal induction caused changes in blood components such as increased amounts of albumin, ALT, and gammaglutamyl transferase (GGT) and decreased urea compared to the control group. Seric antioxidant levels (ferric reducing ability of plasma (FRAP), group A) were significantly increased, and reactive species of oxygen decreased dramatically compared to group B. Milk FRAP levels were lower in group A, and advanced oxidation protein product (AOPP) levels were higher compared to group B. Therefore, it was concluded that the protocol for lactation induction of Lacaune ewes was not effective in the biochemical change in blood and milk.

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The Importance of Prolactin and the Milking Stimulus in the Artificial Induction of Lactation in Cows

Cited by 20 publications

References 11 publications

The Use of Oestrogen, Progesterone and Reserpine in the Artificial Induction of Lactation in Cattle

The Use of Oestrogen, Progesterone and Reserpine in the Artificial Induction of Lactation in Cattle

Growth and Development of the Mammary Gland

Effect of lactation induction on milk production and composition, oxidative and antioxidant status, and biochemical variables

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