Asian-Australasian Journal of Animal Sciences
- 제12권4호
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- Pages.585-589
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- 1999
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- 1011-2367(pISSN)
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- 1976-5517(eISSN)
DOI QR Code
Plasma Prolactin, Blood Metabolites and Yield and Composition of Milk during Early Lactation in Goats Following Administration of Bromocryptine
- Singh, M. (Dairy Cattle Physiology Division, National Dairy Research Institute) ;
- Ludri, R.S. (Dairy Cattle Physiology Division, National Dairy Research Institute)
- 투고 : 1998.04.21
- 심사 : 1998.10.21
- 발행 : 1999.06.01
초록
Six crossbred goats in their 2nd or 3rd lactation, were administered bromocryptine at 5 mg/day during early lactation of 15-20 days (period I) and thereafter again at an interval of 13 days, bromocryptine was given for 5 days (period II). Blood samples were collected before (-5, -4, -3, -2, -1) during (1, 2, 3, 4, 5) and after (+1, +2, +3, +4, +5) administration of bromocryptine in both the periods of study. In period I, administration of bromocryptine resulted in a decrease in milk yield to the extent of 16..8% in comparison to before treatment, and 28.5% after the cessation of treatment. The glucose content of blood increased (p<0.01) as the milk yield decreased without any change in NEFA concentration. During period II of bromocryptine treatment the milk yields did not change in spite of a decline in prolactin level, perhaps the effect of previous treatment was prolonged. A decline in protein and lactose content of milk after bromocryptine treatment in both the periods of study, when prolactin level also declined suggests a role of prolactin in protein synthesis and also a depressing effect on lactose synthesis.
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