The effect of backfat thickness at mating on the reproductive and productive performances of ewes

El‐Maaty, Amal M. Abo

doi:10.1016/j.smallrumres.2011.11.022

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…Previous studies confirmed significant differences of growth performance in depending on breed (Milerski et al, 2006;Maxa et al, 2007), ewe's live weight at mating (Abdel-Mageed and El-Maaty, 2012;Aliyari et al, 2012;Vatankhah et al, 2012), litter size (Kuchtík and Dobeš, 2006;Cloete et al, 2007), sex of lambs (Mohammadi et al, 2010, Ptáček et al, 2011.…”

Section: Introductionmentioning

confidence: 77%

Influence of selected factors on growth performance of Suffolk lambs and their crossbreds

Ptáček¹,

Ducháček²,

Beran³

et al. 2015

j. cent. eur. agric.

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The monitoring was performed in one year period in selected population of Suffolk sheep (SF, n = 257) and their crossbreds with Merinolandschaf (SF × ML, n = 87). Total of 627 lambs (SF, n = 463; SF × ML, n = 164) were observed in breeding conditions of two semi-extensive flocks. Lambs' live weight at 100 days of age (LW100); musculus longissimus lumborum et thoracis (MLLT100) depth and backfat thickness (BT100) at the same age were assessed. Effects of breed, ewes' live weight at mating, litter size, sex of lambs and ewe's age as linear regression were evaluated using SAS 9.1. Significant differences (P < 0.05) in LW100, MLLT100 and BT100 between SF and SF × ML were observed. All the evaluated traits of growth performance were also influenced (P < 0.05) by ewes' live weight at mating. The highest lambs' growth performance traits were detected in lambs of ewes with highest live weight at mating (group of ≥ 80.7 kg). Significant differences (P < 0.05) were observed among singles, twins and triplets lambs as well. Significantly higher LW100 was marked in ram lambs compared to ewe lambs (P < 0.05).

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Section: Introductionmentioning

confidence: 77%

Influence of selected factors on growth performance of Suffolk lambs and their crossbreds

Ptáček¹,

Ducháček²,

Beran³

et al. 2015

j. cent. eur. agric.

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“…Rahmani ewes had higher ( p < .05) litter size (1.16 ± 0.03 vs. 1.01 ± 0.01) and percentage of twin births (18.38% vs. 1.98%) compared with Barki ewes. Rahmani ewes were reported to have higher ovulation rate, 1.29–1.57 vs. 1.16–1.20 (Abdel‐Mageed & Abo El‐Maaty, ) and litter size, 1.12–1.48 vs. 1.00–1.16 (Aboul‐Naga, Aboul‐Ela, & Hassan, ) than Barki ewes. Hashem, El‐Zarkouny, Taha, and Abo‐Elezz () also found that the average rate of twin births and the litter size reached 20.28% and 1.20, respectively, in Barki × Rahmani cross‐bred ewes.…”

Section: Resultsmentioning

confidence: 99%

Genetic screening of FecB, FecX^Gand FecX^I mutations and their linkage with litter size in Barki and Rahmani sheep breeds

El-Seedy

Hashem

El-Azrak

et al. 2017

Reprod Domestic Animals

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Characterization of fecundity genes offers the opportunity to improve production efficiency, and the consequent increase in litter size in livestock industry, through utilizing them in breeding programs. The main objective of this study was to detect the BMPR-IB, BMP15 and GDF9 gene mutations and to investigate whether these mutations are associated with litter size in Egyptian sheep breeds. To achieve this goal, 73 adult ewes representing Barki (n = 33) and Rahmani (n = 40) breeds were used. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) screening approach was used to detect the presence of FecB, FecX and FecX mutations in the two selected breeds. Results of this study showed that the three different candidate gene mutations, namely FecB, FecX and FecX are not present among these selected populations of the Egyptian breeds. Further studies regarding other mutations and/or other genes, which may influence ovulation rate, should be carried out to determine the type and mode of inheritance of such genes in Egyptian sheep breeds.

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“…El espesor de grasa al momento del empadre no afecta la tasa de parición y el tamaño de camada; sin embargo, incrementa el peso de la camada al nacer y al destete (21); por lo que, además de considerar la importancia de la recuperación de la oveja al empadre en los parámetros reproductivos, es necesario valorar los beneficios en el desarrollo futuro de los corderos. Se han encontrado mejores parámetros productivos y reproductivos en ovejas con grasa corporal de 1.5 a 2 mm y las de más de 2 mm comparadas con aquellas con un espesor menor a 1.5 mm (22). En el presente estudio no hubiera sido posible hacer una clasificación de espesor de grasa tan baja al momento del empadre, ya que sólo el 8.6% de ovejas tuvieron un espesor menor a 2 mm, concentrándose el 69.5% entre 2 y 3 mm de grasa.…”

Section: Discussionunclassified

Respuesta reproductiva, metabólica y cambios corporales en ovejas alimentadas con dos niveles de energía

Rodríguez-Magadán¹,

Bautista²,

Cadena-Villegas³

et al. 2021

Rev MVZ Córdoba

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Objetivo. Evaluar la respuesta reproductiva, estado metabólico y cambios corporales en ovejas Dorper y Katahdin suplementadas con dos niveles de energía previo al empadre. Materiales y métodos. Se utilizaron 14 hembras Katahdin y 13 Dorper distribuidas en 2 tratamientos a las cuales se les sincronizó el celo. Catorce días previo a la sincronización de estros, las ovejas se distribuyeron en 2 tratamientos de acuerdo con el nivel de energía en la dieta, T1:2.0 y T2:2.5 Mcal kg-1 de EM. La alimentación abarcó 14 días de adaptación y 14 de alimentación con dieta integral. Al inicio y al final del estudio se midió el espesor de grasa dorsal, área del ojo de la costilla, peso corporal y concentraciones de glucosa e insulina. Se midieron los principales parámetros reproductivos como respuesta a estro, porcentaje de gestación y prolificidad. Se realizaron análisis de varianza y pruebas de ji cuadrada para determinar el efecto del nivel de energía y el genotipo. Resultados. El genotipo y el nivel de energía no afectaron ninguna de las variables medidas, aunque se encontró que con ambos niveles de energía existió un incremento en las concentraciones de glucosa, así como una ganancia en peso, grasa corporal y área del ojo de la costilla. Conclusiones. Debido a que no existió diferencia en los parámetros reproductivos y cambios corporales en ovejas al alimentarlas con los dos niveles de energía, es mejor la alimentación con 2.0 Mcal kg-1 de EM, ya que reduce costos de alimentación.

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The effect of backfat thickness at mating on the reproductive and productive performances of ewes

Cited by 10 publications

References 20 publications

Influence of selected factors on growth performance of Suffolk lambs and their crossbreds

Influence of selected factors on growth performance of Suffolk lambs and their crossbreds

Genetic screening of FecB, FecX^Gand FecX^I mutations and their linkage with litter size in Barki and Rahmani sheep breeds

Respuesta reproductiva, metabólica y cambios corporales en ovejas alimentadas con dos niveles de energía

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The effect of backfat thickness at mating on the reproductive and productive performances of ewes

Cited by 10 publications

References 20 publications

Influence of selected factors on growth performance of Suffolk lambs and their crossbreds

Influence of selected factors on growth performance of Suffolk lambs and their crossbreds

Genetic screening of FecB, FecXGand FecXI mutations and their linkage with litter size in Barki and Rahmani sheep breeds

Respuesta reproductiva, metabólica y cambios corporales en ovejas alimentadas con dos niveles de energía

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Genetic screening of FecB, FecX^Gand FecX^I mutations and their linkage with litter size in Barki and Rahmani sheep breeds