Time of parturition in ewes

Lindahl, Ivan L.

doi:10.1016/0003-3472(64)90006-5

Cited by 37 publications

(19 citation statements)

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“…Normally, the Île-de-France ewes lamb equally during night and day. However, the observations of Lindahl (1964) and George (1969) show that there are effects of age, breed of sheep and season on the time of lambing. Therefore, it is necessary to confirm our results.…”

Section: Discussionmentioning

confidence: 84%

The Induction and Synchronization of Lambing With the Aid of Dexamethasone

Bosc¹

1972

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Dexamethasone (8 or 16 mg), injected intramuscularly into ewes of \l=I^\le-de-Francebreed at the beginning of the lambing period, induced parturition within a mean of 47\m=.\27hr (\m=+-\17\m=.\28) and 45\m=.\04hr (\m=+-\12\m=.\38) after treatment. With 4 mg, the interval between injection and parturition increased to 80\m=.\62hr ( \ m=+-\ 44\m=.\04),compared to 114\m=.\31hr (\m=+-\44\m=.\29) for the controls. No statistical differences were associated with the time of treatment (08.00 or 20.00 hours), but ewes treated at 20.00 hours showed a tendancy to lamb earlier and over a shorter period. For these ewes also, 74\m=.\4% of parturitions took place during the day (06.00 to 18.00 hours) whereas the ewes treated at 08.00 hours lambed equally during day and night, as did the controls.Under the same conditions, these intervals were similar in the Pr\l=e'\alpes ewes, but they increased when injections were given 2 days earlier.No influence on the number or on the sex of the lambs born has been shown and no detrimental effects were observed on the fertility and lactation of treated ewes. These results indicate that dexamethasone may be of use in the synchronization of lambing.

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Section: Discussionmentioning

confidence: 84%

The Induction and Synchronization of Lambing With the Aid of Dexamethasone

Bosc¹

1972

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“…3). Robertson & Rakha (1965) found that their sample of Cheviot ewes tended to come into oestrus around sunrise or sunset, and George (1969) and Lindahl (1964) found that most births took place during the hours of daylight. found, as we did, that there was no preferred time for the onset of oestrus.…”

Section: Bi-paternal Twinsmentioning

confidence: 99%

Multiple mating and siring success during natural oestrus in the ewe

Jewell¹,

Hall²,

Rosenberg³

1986

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Summary. Ewes were each mated on four separate occasions, at 3, 9, 15 and 21 h after the start of oestrus and at each time by a different ram. The progeny were assigned to sires by blood typing, supplemented by resemblance between lambs and rams. The paternity of 64 lambs, born to 41 ewes, was established: 2 were conceived at a 3-h mating, 27 at 9 h, 23 at 15 h and 12 at 21 h. The optimum time for a ram to inseminate, when in competition with others, is therefore 9\p=n-\15h after onset of oestrus, and this finding accords with behavioural observations. Ewes tended to lamb during the same half of the day as that when they had come into oestrus.

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“…A cet égard, les ovins domestiques sont peu différents des bovins (L INDAHL , 1964 ;Bosc, 1980). Certaines espèces sont essentiellement diurnes comme l'alpaga (BuSTINzA et al , 1970 ;SuM A R, 1985) la rate (Bosc, 1981) ou la chèvre (L ICKLITER , 1984(L ICKLITER , /1985 SHORT, 1967 ;C A m p rrELLi et al, 1982C A m p rrELLi et al, /1983.…”

Section: Introductionunclassified