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Titolo:
LONG-TERM BROMOCRIPTINE TREATMENT DURING LATE PREGNANCY HAS DIFFERENTIAL-EFFECTS ON MILK YIELDS OF SINGLE-BEARING AND TWIN-BEARING EWES
Autore:
PETERSON SW; MACKENZIE DDS; MCCUTCHEON SN; LAPWOOD KR;
Indirizzi:
MASSEY UNIV,DEPT ANIM SCI PALMERSTON NORTH NEW ZEALAND MASSEY UNIV,DEPT PHYSIOL & ANAT PALMERSTON NORTH NEW ZEALAND
Titolo Testata:
New Zealand Journal of Agricultural Research
fascicolo: 2, volume: 40, anno: 1997,
pagine: 249 - 259
SICI:
0028-8233(1997)40:2<249:LBTDLP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLACENTAL-LACTOGEN; GROWTH-HORMONE; CHORIONIC SOMATOMAMMOTROPIN; MAMMARY GROWTH; PROLACTIN; LACTATION; GOATS; COWS; SECRETION; ROLES;
Keywords:
PROLACTIN; PROGESTERONE; INSULIN; BROMOCRIPTINE; SHEEP; LACTOGENESIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
S.W. Peterson et al., "LONG-TERM BROMOCRIPTINE TREATMENT DURING LATE PREGNANCY HAS DIFFERENTIAL-EFFECTS ON MILK YIELDS OF SINGLE-BEARING AND TWIN-BEARING EWES", New Zealand Journal of Agricultural Research, 40(2), 1997, pp. 249-259

Abstract

Treatment with 2 alpha-bromoergocriptine mesylate (CB 154) was used to determine the effects on ovine lactogenesis of short- versus long-term suppression of circulating prolactin (PRL) concentrations in single- and twin-bearing ewes and whether the effects were associated with changes in plasma concentrations of progesterone or insulin. Ewes were housed under constant photoperiod(18 h light:6 h dark) from 3-4 weeks pre-partum until 8 days post-partum, then grazed outdoors. Ewes were treated daily with subcutaneous injections of 2 mg CB154 for 20 +/- 1 days pre-partum (CB20 group, n = 10), or for 9 +/- 1 days pre-partum (CB9 group, n = 10), or with excipient injections for 19 +/- 2 days pre-partum (Control group, n = 9), and milked daily for the first week, then on Days 14, 21, and 28 postpartum. CB 154 inhibited PRL. secretion and delayed lactogenesis with no consistent effects on plasma progesterone or insulin concentrations. PRL concentrations were higher (P < 0.05) in CB9 than in CB20 ewes from 14 days pre-partum until 1 day post-partum and plasma PRL concentrations in the two groups converged as they approached parturition (P < 0.01). There was no significant treatment group by pregnancy rank interaction for circulating PRL concentrations. Although the delay in lactogenesis did not differ between CB20 and CB9 ewes, CB154 treatment was more effective in reducing milk yield in twin-bearing than in single-bearing ewes when used for 20 days, butnot for 9 days, pre-partum (P < 0.05). These results indicate that, during the period 20-10 days pre-partum, CB154 treatment had a marked effect on milk yield in twin- but not single-bearing ewes which can notbe explained by corresponding effects on plasma PRL, progesterone,or insulin concentrations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 12:39:21