Climate impacts on reproductive performance of Romanov sheep in the moderate climate

Đuričić, Dražen; Dobos, Attila; Grbavac, Jozo; Stiles, Charlotte; Bacan, Iva; Vidas, Željko; Marković, Franjo; Kočila, Predrag; Samardžija, Marko

doi:10.31893/jabb.22001

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Sheep are commonly classified as short-day breeders and seasonal polyestrous animals [8][9][10] variations in the reproductive activity of sheep breeds occur in subtropical, temperate, and highlatitude environments. The breeding season usually starts in the fall and ends in the winter, with anoestrus taking place in the spring and summer [7,11,12] .The beginning and conclusion of the breeding season are regulated by an endogenous circannual rhythm, which is impacted by the annual photoperiod cycle for regulation and synchronization [12].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Gonadotropin Releasing Hormone on Puberty in Iraqi Awassi Cross Breed Ewe Lambs

Alrawy,

Hussain

2025

Egyptian Journal of Veterinary Sciences

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HIS STUDY investigate how gonadotropin injection affects the growth and onset of puberty in Awassi crossbred ewe lambs. Methods: Fourteen Awassi cross breed ewes-lambs of 5±0.5months of age and average body weight (23.7±1.48) kg were divided into two equal groups at random. One group was used as a control, and the other received Gonadotropin Releasing Hormone (GnRH) treatment. Weighing was done on the ewe-lambs both before and after the experiment, Furthermore, measuring the body condition score, number of ewes expressing first estrus after treatment. Samples of blood were taken biweekly until the observation of pubertal signs (ten weeks). Progesterone and insulin-like growth factor-1 (IGF-1) were measured in sera samples. The results revealed that the group receiving gonadotropin reached puberty 17 days ahead of the control group.The body weight and body condition score of the GnRH treated Awassi ewe lambs were found to be higher compared to those of the control group. Gonadotropin administration had a beneficial effect on increasing progesterone and IGF-1. Conclusion Gonadotropin administration has accelerated puberty in Awassi ewe lambs and there are more trophic signals available, as seen by higher serum progesterone and IGF-1 secretions.

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Section: Introductionmentioning

confidence: 99%

Efficacy of Gonadotropin Releasing Hormone on Puberty in Iraqi Awassi Cross Breed Ewe Lambs

Alrawy,

Hussain

2025

Egyptian Journal of Veterinary Sciences

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“…Sheep breeds in subtropical, temperate, and high-latitude regions experience fluctuations in their reproductive activity throughout the seasons. Typically, the breeding season commences in autumn and concludes in winter, with a period of anoestrus occurring during spring and summer [5][6][7][8]. An endogenous circannual rhythm governs the initiation and termination of the breeding season, with its regulation and synchronization being influenced by the annual photoperiod cycle [9].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Influence of Administration of Kisspeptin-10 on LH Release and Reproductive performance in estrus synchronized ewes

Kadhim,

Hussain

2024

Egyptian Journal of Veterinary Sciences

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HE aim of this study was to elucidate the impact of administering kisspeptin through injection on gonadotropin profile (LH) in treated ewes, to evaluate the effect of CIDR and kisspeptin injection on ovarian cyclicity (estrus activity), pregnancy rate and fecundity in adult ewes. Twenty four local Awassi non-pregnant and non-lactating ewes with three adult Rams of proven fertility of (2-4) years old used in the study, the period of study was extended from March 2022 to December 2022. The Experimental animals, which were sheep in this case, were randomly divided into three groups, each consisting of eight ewe: The First group of control (G1), The control (G1), Estrus synchronization group (G2); utilizes CIDR for estrus synchronization for 12 days+ kisspeptin-10 at time of CIDR withdrawal, and the third group (G3) using only for 12 days. The investigation encompassed the examination of estrus synchronization and the subsequent natural mating of the animals with proven rams. Blood samples were collected 60 and 30 minutes prior to the administration of kisspeptin and CIDR withdrawal,and 15,30, 60, 90, 120, 180, 240, 300, and 360 min after kisspeptin injection. The results indicated that the response duration in G2 and G3 was 49.75 and 60.12 minutes, respectively. These findings revealed no significant differences in duration response. Additionally, there were no significant differences in conception rates between G2 and G3, with rates of 100% and 66.6%, respectively. In terms of lambing rates, G2 achieved 100% while G3 reached 66.6%. Fecundity rates were recorded as 137.5% for G2 and 83.3% for G3, respectively. Regarding the activity of LH, the concentration increase after (15) min of kisspeptin injection. In conclusion, treatment of Awassi ewes with Kisspeptin not effect on reproductive performance and significant affect serum LH concentrations.

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Production, reproduction, and some adaptation characteristics of Romanov sheep raised under humid temperate climate

Akat,

Cam

2024

Animal Science Journal

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This study aimed to determine the fertility and growth traits, viability, and body measurements of the Romanov sheep under breeder conditions in the humid region of Turkey. The animal material of the research consisted of sheep imported from Ukraine in 2019. In the study, there are two farms with 31 and 44 ewes in the first year and three farms with 45, 34, and 32 ewes in the second year. The reproductive performances of 186 sheep and lambs in three different farms were examined, and nine rams, one ram per 20 sheep, were used for mating. Two‐year (2020 and 2021) data on the reproductive performance of pure Romanov ewes, survivability in ewes and lambs, and development characteristics in lambs were used in the present study. The conceived rate (88.17%), fecundity at birth (1.42) and at weaning (1.29), litter size at birth (1.76) and weaning (1.56), single (50.98%), twin (41.83%), and triplet birth rate (6.54%), and abortion rate (6.71%) were determined for 2 years average. Birth and weaning weights of lambs were affected by sex and birth type (p < 0.01). The Romanov sheep and their lambs did not satisfy the breeder regarding reproductive performance and lamb development.

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Climate impacts on reproductive performance of Romanov sheep in the moderate climate

Abstract: This study aimed to investigate the climatical impacts of air temperature, sunlight duration, and rain precipitation, in a moderate climate, on the reproductive performance of Romanov sheep in the continental part of Croatia, during two consecutive years (2019-2020).

Cited by 4 publications

References 22 publications

Efficacy of Gonadotropin Releasing Hormone on Puberty in Iraqi Awassi Cross Breed Ewe Lambs

Efficacy of Gonadotropin Releasing Hormone on Puberty in Iraqi Awassi Cross Breed Ewe Lambs

Assessing the Influence of Administration of Kisspeptin-10 on LH Release and Reproductive performance in estrus synchronized ewes

Production, reproduction, and some adaptation characteristics of Romanov sheep raised under humid temperate climate

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