Ewe reproduction and lambing performance in a five period mating system

deNicolo, G.; Morris, S. T.; Kenyon, P. R.; Kemp, Peter; Morel, P. C. H.

doi:10.1080/00288230809510470

Cited by 9 publications

(5 citation statements)

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“…Iraqi Awassi ewes considered as seasonal ewes, Iraqi researchers approved 40% seasonality of Iraqi Awassi ewes [4,5]. The seasonal anestrus is considered one of the main causes important problems in sheep, which causes poor reproductive efficiency [6]. The management methods in ruminants as estrous synchronization is successfully to enhance reproductive efficiency [7].…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Al-Mousawe,

Ibrahim

2024

Egyptian Journal of Veterinary Sciences

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HE aim of this study was to diagnose pregnancy in Iraqi Awassi ewes by assessing progesterone (P4) levels and using ultrasonography after inducing fertile estrus during the anestrus season with Sulpiride, a dopamine antagonist for improvement of reproductive efficiency. This study was conducted from December 2022 to June 2023, with ewes randomly divided into two groups, each consisting of 6 ewes. The treatment group received a dose of 0.6mg/kg of Sulpiride, while the control group received normal saline. The results showed a significant (P < 0.05) estrus response in the treated group. P4 concentrations were significantly higher (P < 0.05) in the treatment group on days 14, 21, and 28. However, the results of ultrasonography for pregnancy detection were non-significant in both the treatment and control groups at 30%, 60%, and 75% on days 30, 60, and 75, respectively, due to a high rate of early embryonic mortality. In conclusion, the use of Sulpiride proved to be a successful method for inducing fertile estrus in ewes, serving as a nonhormonal intervention during the seasonally anestrus period. The Seasonal anestrus is considered one of the main causes important problems in sheep, which causes Poor reproductive efficiency. P4 hormone measurement and ultrasonography were found to be rapid, safe, and reliable methods for diagnosing early pregnancy for improvement of reproductive efficiency in Iraqi Awassi ewes.

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Section: Introductionmentioning

confidence: 99%

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Al-Mousawe,

Ibrahim

2024

Egyptian Journal of Veterinary Sciences

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“…Intensive lamb production systems involve the obtention of more than one lambing per ewe per year. Accelerated lambing systems require the implementation of two, three or even five breeding periods at different times of the year [1,2]. When these systems are used to manage highly seasonal ovine breeds, at least one of the breeding periods coincides with the middle of the anestrous season.…”

Section: Introductionmentioning

confidence: 99%

“…When these systems are used to manage highly seasonal ovine breeds, at least one of the breeding periods coincides with the middle of the anestrous season. Poor reproductive efficiency is attained at that time, and this affects the overall productivity of the system [1–3].…”

Section: Introductionmentioning

confidence: 99%

“…Induction of ovarian activity during seasonal anestrus is best achieved through the use of progesterone (P4) or synthetic progestogens [4], so that accelerated lambing systems often include the use of these hormones during the periods of low or absent natural ovarian activity [1,3]. However, consumer concerns regarding negative health and environmental effects from the use of steroid hormones in animal production are increasing [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Induction of fertile estrus without the use of steroid hormones in seasonally anestrous Suffolk ewes

Miguel-Cruz

Mejía-Villanueva

Zarco

2019

Asian-Australas J Anim Sci

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ObjectiveTo evaluate the efficacy of treatments based on gonadotrophin-releasing hormone (GnRH), GnRH-prostaglandin F2α (PGF2α), and/or intense exposure to novel rams to induce fertile estrus without the use of steroid hormones in seasonally anestrous Suffolk ewes.MethodsIn the first experiment, ewes were treated with one injection of GnRH, two injections of GnRH administered 7 days apart, or a sequence of GnRH-PGF2α-GnRH (GPG). In the second experiment anestrous ewes were exposed, for 36 days starting on the day of weaning, to groups of four rams of three different breeds that were alternated every day. Besides exposure to the male effect (ME), the ewes were injected with saline solution (ME group, n = 20), with GnRH (ME-GnRH group, n = 20) or with a sequence of GnRH-PGF2α-GnRH (ME-GPG group, n = 20). The rams used for male-effect were fitted with aprons to prevent mating, and ewes detected in estrus were bred to selected fertile rams. Ovarian activity was monitored by progesterone determinations in both experiments.ResultsIn the first experiment sustained induction of ovarian activity was not achieved and no ewe was detected in estrus. In the second experiment induction of sustained ovarian activity was achieved in all groups. Most of the ewes were detected in estrus, 76.7% of the ewes were mated during a 36-d breeding period and 71.7% of all the ewes became pregnant during that period. No significant differences between groups were found for any of these variables. However, estrus detection efficiency was higher in the ME-GnRH group than in the ME group (p<0.05).ConclusionAn intense male-effect, that included the continuous presence and frequent alternation of several rams of different breeds, was sufficient to induce ovarian activity and fertile estrus in Suffolk ewes during the period of deep anestrus without the use of hormones, although addition of GnRH improved the efficiency of estrus detection.

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“…Досліджуючи проблему поліестричності овець порід Фінський ландрас та Ромні-марш G. deNicolo, S. T. Morris, P. R. Kenyon, P. D. Kemp & P. C. H. Morel [7] зауважують, що сезон розмноження є важливим фактором, що впливає на запліднюваність маток, вихід ягнят, їх збереженість та інтенсивність росту. Для вівцематок обох порід в умовах Нової Зеландії, характерна висока запліднюваність в березні та червні (91-94 %), тоді як у серпні та листопаді -лише на рівні 39-68 % з перевагою породи Фінський ландрас над Ромні.…”

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The Impact of Weight Gain Og Sheep in Non-Reproductive Period on Reproductive Qualities

Помитун

Kosova

Pankiv

et al. 2022

STBIAS

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Studies were undertaken in the breeding facility of the Іnstitute of Animal Science NAAS "Gontarovka” on sheep 3-8 years of age of the Kharkiv type of breed of Merinos precoce. For this purpose, (early May 2020) the indexes of living mass were certain on electronic scales within 0.1 kg Whereupon animals were contained during May - September at the camp-pascual system with the additional fertilizing by grain of oat for 0.5 kg/ in a day and by a pasture on a natural pasture. Before the artificial insemination living mass of animals and their general increase was also certain for a period of preparation for the new cycle of reproduction, and after lambing their fecundity, the living mass of lambs, was taken into account at birth, in 20 - and 90-day's age. It is set that the living mass of sheep that in a next reproduction campaign bore lone persons increased for an unreproductive period by 19.8%, at giving birth twins this index grew by 22.2%, and for animals, giving triplet birth increased by 28.2%. Here living mass of sheep, that in a subsequent period had twins and triplets in an initial period of account felt strongly anymore about animals lambed individually on 6.1-7.3%. Thus, the difference between the first and second groups of uteruses appeared high-credible (р<0.001). At the end of the registration period difference on behalf of sheep 2 and 3 groups against the first group increased accordingly to 9.3% (р<0.001) and 13.5% (р<0.05). The average daily increases of lambs for the period from their birth to 20 days ha have a sufficiently clear connection with the indexes of increase of living mass of their mothers in the period of preparation for the new cycle of reproduction. The average daily gain of yags for the period from their birth to 20 days is quite clearly related to the growth rates of live weight of their mothers in preparation for the new cycle of reproduction. The maximum average gain of lambs was obtained from ewes, the increase in live weight of which in the study period ranged from 10 to 15.9 kg. On this basis, lambs exceeded the results of peers from 6.1 to 17.9%. The indexes of living mass of eves before their insemination have positive coefficients of correlations with a living mass of lambs at wean from mother, and also average daily increases of lambs for the first 20 days of their life. They were made according to 0.346, 0.243 and 0.113.

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Ewe reproduction and lambing performance in a five period mating system

Abstract: Ewe reproduction and lamb performance in two breeds (East Friesian Composite (EF) and Romney) was assessed at five different breeding and lambing periods within a year, including three aseasonal breeding periods, over a 3-year period.

Cited by 9 publications

References 38 publications

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Diagnosis of Pregnancy in Iraqi Awassi Ewes Through Progesterone Hormone Measurement and Ultrasonography Following Induction of Fertile Estrus with Sulpiride

Induction of fertile estrus without the use of steroid hormones in seasonally anestrous Suffolk ewes

The Impact of Weight Gain Og Sheep in Non-Reproductive Period on Reproductive Qualities

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