A note on the use of dexamethasone for inducement of parturition of Finn × Dorset ewes

Shevah, Y.

doi:10.1017/s0003356100017293

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…The use of this procedure in ewes received an intramuscular injection of prolific sheep breeds may have special effects either: (i) 16 mg dexamethasone (9a-fluoroon the behaviour of the ewe and lamb at 16a-methylprednisolone; Sigma Chemical Co.) parturition and on lamb mortality. Time of lambing after injection ( no overall significant effect of litter size on time of lambing after dexamethasone treatment, which is contrary to that found by Shevah (1974), but there was a trend for twin-and triplet-bearing ewes treated with phosphate buffer to lamb earlier than ewes bearing singles. 1-8) h; no.…”

contrasting

confidence: 77%

“…On day (Thimonier,Cognie,Cornu,Schneberger and 144 (day 1 = day of mating) at 18.00 h the Vernusse, 1975). = 136) (P < 0-001), confirming the well-documented effects of this treatment (Bosc, 1972;Shevah, 1974). This paper in 2 ml phosphate buffer (0-03 mol/1) or (ii) examines these effects in the prolific 2 ml phosphate buffer (0-05 mol/1 Ewes injected with dexamethasone ( Figure 1) lambed significantly earlier (62-8 (s.e.…”

supporting

confidence: 59%

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A note on the effects of dexamethasone-induced parturition on ewe behaviour and lamb survival in prolific Booroola Merino ewes

et al. 1985

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Normal and dexamethasone-induced parturition were compared in Merino and prolific Booroola Merinos carrying crossbred foetuses. Behavioural observations were recorded for 42 single-, 27 twin-and 10 triplet-bearing ewes. After treatment on day 144 of gestation, ewes injected with dexamethasone lambed 41 h earlier than ewes injected with phosphate buffer. On the phosphate-buffer treatment, Booroola Merino ewes lambed 22 h earlier than Merino ewes. Twin-and triplet-bearing ewes which were induced to lamb had a significantly longer duration of labour than ewes bearing singles which were induced to lamb, and ewes, regardless of litter size, which lambed naturally. Induction of parturition had no significant effect on the lambs' behaviour subsequently. Lamb survival was not influenced by dexamethasone treatment but was significantly influenced by lamb birth weight, which declined as litter size increased.

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confidence: 77%

supporting

confidence: 59%

A note on the effects of dexamethasone-induced parturition on ewe behaviour and lamb survival in prolific Booroola Merino ewes

et al. 1985

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“…In the 1972 trial an intramuscular injection (16 mg) of dexamethasone was given to all the ewes on the 141st day of gestation to induce parturition (Shevah, 1974).…”

Section: Methodsmentioning

confidence: 99%

Differences in feed intake and the performance of Finn × Dorset ewes during late pregnancy

Shevah

Black

Land³

1975

Anim. Prod.

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In two experiments carried out in the autumn of 1971 and 1972 (treatment prefixes 1 and 2 respectively), 84 Finn x Dorset ewes found by X-ray to carry from 1 to 4 foetuses were individually fed during the last 6 weeks of gestation either: 1A, ad libitum; 1H and 2H, 33 kcal M/kg ewe live weight+365 kcal per ME/kg foetus (anticipated birth weight); 1M, 80%; and 2L, 50% of the total energy fed to treatments 1H and 2H. The amounts given remained constant during the experimental period. The method of feeding according to foetal number within treatments, attempted to standardize the nutritional state within treatments. All ewes (except those on 2L which remained constant) gained 6 to 8 kg live weight during the last 6 weeks of gestation and lost 8 to 10 kg at parturition. The birth weight of lambs was not affected by the range of energy (2-3 to 4-4 Meal ME/ewe per day) consumed during the last 6 weeks of gestation. Plasma concentrations of free fatty acids (FFA), glucose and ketone bodies were determined weekly. The mean FFA levels were significantly higher in the low energy treatment groups than the high ones. The present data indicated that if there is little change in body weight in the early stages of pregnancy a 65 kg ewe bearing twin lambs, will require about 4 Meal ME/day during the last 50 days of gestation to prevent a rise in plasma FFA concentration or loss of weight over the gestation period.

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“…Soon after withdrawal, the samples were centrifuged, and the plasma was drawn off and stored at -15°C pending analysis. On the 141st day of gestation between 20.00 and 21.00 hours, the ewes were injected intramuscularly with 16 mg dexamethasone (Berk Pharmaceutical Ltd, Surrey) to induce parturition (Shevah, 1974) and the lambing data were recorded. Plasma non-esterifiedfatty acids These (FFA) were determined by the method described by Patterson (1963), and were used as an indication of nutritional state (Patterson, 1963;Shevah et al, 1975).…”

Section: Materials and Methods Animals And Treatmentsmentioning

confidence: 99%

THE EFFECTS OF NUTRITION ON THE REPRODUCTIVE PERFORMANCE OF FINN x DORSET EWES

Shevah¹,

Wj²,

Wr³

et al. 1975

Reproduction

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Progesterone and LH concentrations were measured in the plasma of blood samples taken from forty-eight pregnant ewes on Days 100, 120 and 134 of gestation. The ewes, in two groups of twenty-four were maintained from Day 100 until parturition on two planes of nutrition which supplied daily energy and protein intakes of about 4-1 or 2-3 Mcal metabolizable energy and either 192 or 111 g digestible crude protein per ewe. Within the groups, the ewes carried one, two or three fetuses and the feed intake was adjusted according to litter size to produce a uniform nutritional state within the group. On Day 100, litter size affected the concentration of plasma progesterone (P less than 0-001), but had no effect on Days 120 or 134 when the ewes were fed according to litter size. The low feed intake however caused a significant increase in plasma progesterone concentrations. The LH concentrations showed no major changes during late pregnancy and no effect of nutrition or little size on the plasma hormone concentration was observed. It was concluded that the effect of litter size on plasma progesterone concentration recorded on Day 100 or gestation was partly mediated by level of nutrition.

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A note on the use of dexamethasone for inducement of parturition of Finn × Dorset ewes

Cited by 10 publications

References 6 publications

A note on the effects of dexamethasone-induced parturition on ewe behaviour and lamb survival in prolific Booroola Merino ewes

A note on the effects of dexamethasone-induced parturition on ewe behaviour and lamb survival in prolific Booroola Merino ewes

Differences in feed intake and the performance of Finn × Dorset ewes during late pregnancy

THE EFFECTS OF NUTRITION ON THE REPRODUCTIVE PERFORMANCE OF FINN x DORSET EWES

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