Artificial induction of lactation in cattle: initiation of lactation and estrogen and progesterone concentrations in milk

Journal of Dairy Science
G J SawyerC Gow

Abstract

Thirty heifers were given 11 subcutaneous injections of 5 mg estradiol benzoate and 200 mg progesterone every 3 d to develop their mammary glands. Three days later groups of animals were treated with 1) 20 mg dexamethasone twice, 2) 500 micrograms cloprostenol thrice, 3) dexamethasone and cloprostenol, 4) oxytocin 4 IU six times, or 5) no further injections. Two further groups of six heifers each (6 and 7) were treated in a manner similar to groups 1 and 3 except the dose of estrogen to develop their mammary glands was doubled to 10 mg/3 d. Six lactating first calf heifers were controls (8). The proportion of animals lactating, combined milk yield for each group (kg), and mean days lactated were 1) 5/6, 3831, 142; 2) 1/6, 912, 195; 3) 6/6, 4898, 194; 4) 3/6, 1066, 128; 5) 1/6, 293, 154; 6) 6/6, 6109, 130; 7) 6/6, 6265, 130; and 8) 6/6, 19, 190, 251. The lactogenic response to dexamethasone and oxytocin is similar to that in sheep, but the response to cloprostenol indicates a species difference. Intensive blood sampling before and after injection of hormones, intended to trigger lactogenesis, showed that plasma prolactin rose to peaks above 210 ng/ml in cows of groups 2, 3, and 4 and were unchanged from the base below 40 ng/ml i...Continue Reading

References

Dec 1, 1979·Journal of Dairy Science·R S KensingerR J Collier
Dec 1, 1977·Australian Journal of Biological Sciences·W J FulkersonL R Fell
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Oct 1, 1974·The Journal of Endocrinology·W J Fulkerson, G H McDowell
Jan 1, 1980·New Zealand Veterinary Journal·H R TervitA J Peterson

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Citations

Jan 23, 2017·Journal of Dairy Science·Germán G KaiserAdrián A Mutto

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