The reproductive performance of Finn × German Mutton Merino and purebred German Mutton Merino Ewes

Amir, D.; Schindler, H; Rosenberg, Miriam; Folman, Y.

doi:10.1016/0301-6226(80)90048-2

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…Silent ovulations during mid-anoestrus (April-May) occurred in about 50 % of the ewes, in the ewes lambing in both October (7 out of 16) and January (7 out of 14). Similar results were also obtained with Finn x GMM ewes (Amir et al 1980).…”

Section: A / \supporting

confidence: 87%

“…Data on the sexual season and the ovarian activity of Finn x GMM ewes during seasonal anoestrus have been reported previously (Amir et al 1980). In the Finn x Awassi animals (Table 1) the last seasonal oestrus was observed in February-March in all but one ewes of the October-lambing group.…”

Section: Seasonal Anoestrusmentioning

confidence: 68%

“…The ewes of this group came in the next sexual season at a rate and time very similar to those of the animals which lambed in October. In a previous study (Amir et al 1980) it was also reported that no significant difference was found in the rate of entering the sexual season between November-and February-Aprillambing ewes of the German Mutton Merino breed, and between Finn x GMM ewes which lambed during January-March and those which lambed during April-May.…”

Section: Seasonal Anoestrusmentioning

confidence: 83%

“…The different conception rates of ewes of different breeds during seasonal anoestrus (Cognie, Hernandez-Barreto & Saumande, 1975;Hackett et al 1979;D. A. Amir, unpublished;Amir et al 1980) might have resulted from differences in the percentage of ewes displaying ovarian activity during this season s (Thimonier & Maule'on, 1969).…”

Section: Post-partum Anoestrusmentioning

confidence: 99%

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Oestrous and ovarian activities of Finn-cross ewes during the post-partum and the seasonal anoestrous periods

1984

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SummaryThe seasonal and post-partum oestrus occurrence and ovarian activity, assessed by the plasma progesterone concentrations, were studied in Finn-cross ewes following autumn and winter lambings.The last seasonal oestrous cycle was followed by a silent ovulation in C0% of the Finn × Awassi ewes. Silent ovulations during midanoestrus occurred in 50% of the ewes, and in 90% of the animals a silent ovulation preceded the normal resumption of the seasonal sexual activity.The first post-partum oestrus occurred within C0 days after October lambings in about 90% of the ewes. Silent ovulations before the first post-partum oestrus were evident in 70% of the recycling ewes.It is suggested that breeding ewes with ovarian activity after oestrus induction during anoestrous periods might increase the reproductive performance of the flock in a frequent lambing system.

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Section: A / \supporting

confidence: 87%

Section: Seasonal Anoestrusmentioning

confidence: 68%

Section: Seasonal Anoestrusmentioning

confidence: 83%

Section: Post-partum Anoestrusmentioning

confidence: 99%

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Oestrous and ovarian activities of Finn-cross ewes during the post-partum and the seasonal anoestrous periods

1984

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“…From the results of the present study it appears that after January-February lambings the Finncross ewes of both the control and the light-treated groups resumed normal cycle activity and did not enter seasonal anoestrus, in contrast to previous reports on the same breed (Amir et al 1980;Amir, 1984;Amir, Rosenberg & Schindler, 1984). Still, the mean intervals from lambing to first ovulation and oestrus were considerably longer than those reported after October lambings in the same breed (Amir et al 1984).…”

Section: Discussioncontrasting

confidence: 71%

The effect of artificial light, hormones, and rams on the reproductive performance of Finn-cross ewes during the seasonal anoestrus in Israel

Amir

Gacitua

1985

J. Agric. Sci.

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SUMMARYAdult Finn-cross ewes, pregnant from September matings, were kept under natural (control) or artificial photoperiod (experimental). The artificial photoperiod consisted of an abrupt increase in daylength to 18 h for 30 days in November, followed by a step wise decrease of 30 min every 10 days until May.The ewes of the two groups were either exposed daily to rams after lambing in January-February or after weaning in March, or were kept isolated from the males until mating in April. Time of mating in the latter animals was determined by measuring the intra-vaginal electrical impedance. Hormone treatment for oestrus induction was given after weaning to a portion of the control and experimental ewes. The ovarian activity of the animals was determined by examining their plasma progesterone changes.Daily teasing of the ewes from lambing to weaning and/or treatment with artificially decreasing daylength did not influence the ovarian activity during this period. All the ewes which were examined for ovulation, from both the control and experimental groups, ovulated 40–60 days after lambing, and 96% of the animals of the two groups which were not treated with hormones for oestrus induction exhibited spontaneous oestrus in March–May.The lambing–first ovulation and the lambing–first spontaneous oestrus intervals were longer in the light-treated than in the control ewes, and in the animals kept isolated from the rams until mating than in those exposed to the males after lambing or weaning.A conception rate of 70–100% and a high rate of cycle activity were obtained during the two consecutive years of the experiment in both control and experimental animals, treated or not with hormones and exposed or not to rams. In view of these results, no conclusions could be drawn about the effectiveness of the artificial photoperiod, ram effect and hormone treatment, alone or in combination, in inducing cycling activity and to increase the fertility of Finn-cross ewes during the seasonal anoestrus in Israel.

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Sexual activity of Assaf ewes after October and February lambings

Amir

Gacitua

1987

Theriogenology

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The reproductive performance of Finn × German Mutton Merino and purebred German Mutton Merino Ewes

Cited by 7 publications

References 15 publications

Oestrous and ovarian activities of Finn-cross ewes during the post-partum and the seasonal anoestrous periods

Oestrous and ovarian activities of Finn-cross ewes during the post-partum and the seasonal anoestrous periods

The effect of artificial light, hormones, and rams on the reproductive performance of Finn-cross ewes during the seasonal anoestrus in Israel

Sexual activity of Assaf ewes after October and February lambings

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