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Registros recuperados : 14 | |
2. | | DE BARBIERI, I.; MONTOSSI, F.; VIÑOLES, C.; KENYON, P.R. Effect of shearing ewes during mid-and late-pregnancy on lambs weight at birth and survival to weaning under grazing conditions in Uruguay. Small Ruminant Research, Volume 119, Issues 1–3, June 2014, Pages 28-32. DOI: http://dx.doi.org/10.1016/j.smallrumres.2014.03.004 Article history:Received 7 September 2013; Received in revised form 11 March 2014; Accepted 14 March 2014;Available online 25 March 2014 . Acknowledgements: The authors thank the dedication, effort and compromise of the following farmers,...Biblioteca(s): INIA Tacuarembó. |
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6. | | RAMOS, Z.; GARRICK , D. J.; BLAIR, H. T.; VERA, B.; CIAPPESONI, G.; KENYON, P. R. Genomic regions associated with wool, growth and reproduction traits in Uruguayan Merino Sheep. Genes, 2023, volume 14, issue 1, article 167. OPEN ACCESS. doi: https://doi.org/10.3390/genes14010167 Article history: Received 13 December 2022; Revised 29 December 2022; Accepted 4 January 2023; Published 7 January 2023. -- Correspondence author: Zully Ramos, email: z.ramosalvez@massey.ac.nz -- Academic Editor: Qiuyue Liu -- This...Biblioteca(s): INIA Las Brujas. |
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7. | | RAMOS, Z.; GARRICK, D.; BLAIR, H.; DE BARBIERI, I.; CIAPPESONI, G.; MONTOSSI, F.; KENYON, P. Nuevos parámetros genéticos para rasgos productivos y reproductivos del Merino Australiano. Producción Animal. Revista INIA Uruguay, Marzo 2023, no.72, p.22-25. (Revista INIA; 72).Biblioteca(s): INIA Las Brujas. |
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8. | | RAMOS, Z.; BLAIR, H.T.; DE BARBIERI, I.; CIAPPESONI, G.; MONTOSSI, F.; KENYON, P.R. Phenotypic responses to selection for ultrafine wool in Uruguayan yearling lambs. Agriculture, 2021, v. 11, n, 2. DOI: https://doi.org/10.3390/agriculture11020179. OPEN ACCESS. Article history: Received: 28 January 2021; Accepted: 19 February 2021; Published: 22 February 2021. Acknowledgments: The authors thank the assistance of all staff of Glencoe Experimental Unit,
INIA Tacuarembó, SUL, SCMAU, INIA and CRILU.Biblioteca(s): INIA Tacuarembó. |
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9. | | RAMOS, Z.; BLAIR, H.T.; DE BARBIERI, I.; CIAPPESONI, G.; MONTOSSI, F.; KENYON, P.R. Productivity and reproductive performance of mixed-age ewes across 20 years of selection for ultrafine wool in Uruguay. Agriculture, 2021; 11(8):712. Doi: https://doi.org/10.3390/agriculture11080712 Article history: Received 9 July 2021, Revised 21 July 2021, Accepted 25 July 2021, Published: 28 July 2021.
Academic Editor: Milan Shipka.
This article is an open access article distributed under the terms and conditions of the Creative...Biblioteca(s): INIA Las Brujas. |
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10. | | LÓPEZ-MAZZ; BALDI, F.; QUINTANS, G.; KENYON, P.R.; CORREA, O.; REGUEIRO, M.; ÁLVAREZ-OXILEY, A.; BANCHERO, G. Efecto sobre el comportamiento productivo, reproductivo y la respuesta al desafío parasitario en corderas cuyas madres fueron esquiladas a los 50 días de gestación. In: QUINTANS, G.; IEWDIUKOW, M. (Ed.). Primer Seminario Técnico de Programación Fetal. Montevideo (UY): INIA, 2019. p. 99-109. (INIA Serie Técnica; 252)Biblioteca(s): INIA Treinta y Tres. |
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11. | | LÓPEZ-MAZZ, C.; BALDI, F.; QUINTANS, G.; KENYON, P.R.; CORREA, O.; REGUEIRO, M.; ÁLVAREZ-OXILEY, A.; BANCHERO, G. Effect of early shearing during gestation on the productive and reproductive behavior of female sheep offspring in their first 18 months of age. Animal, 1 April 2020, Volume 14, Issue 4, Pages 807-813. Doi: https://doi.org/10.1017/S1751731119002441 Article history: Received 19 September 2018/ Accepted 17 September 2019Biblioteca(s): INIA La Estanzuela; INIA Treinta y Tres. |
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12. | | RAMOS, Z.; GARRICK, D.J.; BLAIR, H.T.; DE BARBIERI, I.; CIAPPESONI, G.; MONTOSSI, F.; KENYON, P.R. Genetic and phenotypic relationships between ewe reproductive performance and wool and growth traits in Uruguayan Ultrafine Merino sheep. Journal of Animal Science, 2023, Volume 101, skad071. OPEN ACCESS. https://doi.org/10.1093/jas/skad071 Article history: Received 13 July 2022; Accepted 06 March 2023; Published 07 March 2023; Corrected and typeset 14 April 2023. -- Corresponding author: z.ramosalvez@massey.ac.nz -- Issue Section: Animal Genetics and Genomics...Biblioteca(s): INIA Las Brujas. |
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13. | | MULVANEY, F.J.; MORRIS, S.T.; KENYON, P.R.; MOREL, P.C.H.; WEST, D.M.; VIÑOLES, C.; GLOVER, K.M.M. Comparison between the reproductive performance of ewe hoggets and mature ewes following a progesterone-based oestrus synchronization protocol. New Zealand Journal of Agricultural Research, 2013, v.56, no.4, p. 288-296. 0028-8233 Article history: Received 27 May 2013 // Accepted 5 September 2013.Biblioteca(s): INIA Las Brujas. |
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14. | | PAGANONI, B.L.; FERGUSON, M.B.; FERRIO, S.; JONES, C.; KEARNEY, G.A.; KENYON, P.R.; MACLEAY, C.; VIÑOLES, C.; THOMPSON, A.N. Early reproductive losses are a major factor contributing to the poor reproductive performance of Merino ewe lambs mated at 8-10 months of age. Animal Production Science, 2014, v.54, no.6, p.762-772. Article history: Received 13 June 2013 / Accepted 26 February 2014 / Published online 9 April 2014.Biblioteca(s): INIA Las Brujas; INIA Tacuarembó. |
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Registros recuperados : 14 | |
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| Acceso al texto completo restringido a Biblioteca INIA Las Brujas. Por información adicional contacte bibliolb@inia.org.uy. |
Registro completo
|
Biblioteca (s) : |
INIA Las Brujas; INIA Tacuarembó. |
Fecha actual : |
21/10/2014 |
Actualizado : |
11/10/2019 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Circulación / Nivel : |
B - 1 |
Autor : |
PAGANONI, B.L.; FERGUSON, M.B.; FERRIO, S.; JONES, C.; KEARNEY, G.A.; KENYON, P.R.; MACLEAY, C.; VIÑOLES, C.; THOMPSON, A.N. |
Afiliación : |
CAROLINA VIÑOLES GIL, Instituto Nacional de Investigación Agropecuaria (INIA), Uruguay. |
Título : |
Early reproductive losses are a major factor contributing to the poor reproductive performance of Merino ewe lambs mated at 8-10 months of age. |
Fecha de publicación : |
2014 |
Fuente / Imprenta : |
Animal Production Science, 2014, v.54, no.6, p.762-772. |
ISSN : |
1836-0939 |
DOI : |
10.1071/AN13240 |
Idioma : |
Inglés |
Notas : |
Article history: Received 13 June 2013 / Accepted 26 February 2014 / Published online 9 April 2014. |
Contenido : |
ABSTRACT.
The reproductive performance of Merino ewe lambs is lower than that achieved by mature ewes and is highly variable. It is likely that embryo loss represents a major source of reproductive wastage in Merino ewe lambs, but to our knowledge no studies have attempted to determine when the major reproductive losses occur or identify predisposing factors that are likely to lead to high rates of pregnancy failures in ewe lambs. After characterising where reproductive losses occurred in Merino ewe lambs mated at 8-10 months of age, we tested the hypothesis that pregnancy failure in ewe lambs is influenced by nutrition and liveweight change around conception and the genetic potential for growth of the ewe lamb. Two-hundred and twenty-four Merino ewe lambs born from 10 sires with Australian Sheep Breeding Values were teased for 14 days using vasectomised rams, and then fed two different diets for 68 days during mating. All ewe lambs were weighed and the appearance of crayon marks on their rump was recorded most days. Blood samples for progesterone assay were collected on Days 5, 12 and 17 after the first record of a crayon mark. Ultrasonography using a trans-rectal probe was used to measure the number of corpora lutea present, as a proxy for ovulation rate, 9 days after the first record of a crayon mark during the mating period. A further trans-rectal ultrasonography was undertaken 30 days after marking from the entire ram to determine pregnancy status and count the number of embryos. Over the entire mating period 54% of ewe lambs were pregnant with 66 fetuses per 100 ewes mated. The average ovulation rate was 150% however up to 84% of this potential was lost by weaning and the major contributor to this apparent deficit was the loss that occurred during the first 17 days after mating. Pregnancy failure was not significantly related to nutrition or liveweight change during mating however, there were significant differences in pregnancy failure between different sire groups. Pregnancy failure was significantly less for ewe lambs from sires with higher breeding values for weight and fat at post-weaning age (8-10 months). Only 60% of ewe lambs had achieved puberty when rams were introduced and only 83% by 35 days after mating. In addition, almost half of the ewe lambs that were mated for the first time during the first 35 days after rams were introduced, but failed to get pregnant, then seemed to skip a cycle or did not cycle again before the end of the 68-day mating period. Liveweight at introduction of entire rams was positively related to fertility, ovulation rate and reproductive rate. This study confirms that selection of sires with higher breeding values for post-weaning weight and fat will increase the fertility and reproductive rate of Merino ewe lambs mated at 8-10 months. This response is due in part to enhancing the onset of puberty and increasing the proportion of ewe lambs cycling at the start of mating and reducing pregnancy failure.
© CSIRO 2014. MenosABSTRACT.
The reproductive performance of Merino ewe lambs is lower than that achieved by mature ewes and is highly variable. It is likely that embryo loss represents a major source of reproductive wastage in Merino ewe lambs, but to our knowledge no studies have attempted to determine when the major reproductive losses occur or identify predisposing factors that are likely to lead to high rates of pregnancy failures in ewe lambs. After characterising where reproductive losses occurred in Merino ewe lambs mated at 8-10 months of age, we tested the hypothesis that pregnancy failure in ewe lambs is influenced by nutrition and liveweight change around conception and the genetic potential for growth of the ewe lamb. Two-hundred and twenty-four Merino ewe lambs born from 10 sires with Australian Sheep Breeding Values were teased for 14 days using vasectomised rams, and then fed two different diets for 68 days during mating. All ewe lambs were weighed and the appearance of crayon marks on their rump was recorded most days. Blood samples for progesterone assay were collected on Days 5, 12 and 17 after the first record of a crayon mark. Ultrasonography using a trans-rectal probe was used to measure the number of corpora lutea present, as a proxy for ovulation rate, 9 days after the first record of a crayon mark during the mating period. A further trans-rectal ultrasonography was undertaken 30 days after marking from the entire ram to determine pregnancy status and count the number ... Presentar Todo |
Thesagro : |
COMPORTAMIENTO REPRODUCTIVO; CORDEROS; MERINO; OVINOS. |
Asunto categoría : |
L01 Ganadería |
Marc : |
LEADER 03985naa a2200301 a 4500 001 1051211 005 2019-10-11 008 2014 bl uuuu u00u1 u #d 022 $a1836-0939 024 7 $a10.1071/AN13240$2DOI 100 1 $aPAGANONI, B.L. 245 $aEarly reproductive losses are a major factor contributing to the poor reproductive performance of Merino ewe lambs mated at 8-10 months of age.$h[electronic resource] 260 $c2014 500 $aArticle history: Received 13 June 2013 / Accepted 26 February 2014 / Published online 9 April 2014. 520 $aABSTRACT. The reproductive performance of Merino ewe lambs is lower than that achieved by mature ewes and is highly variable. It is likely that embryo loss represents a major source of reproductive wastage in Merino ewe lambs, but to our knowledge no studies have attempted to determine when the major reproductive losses occur or identify predisposing factors that are likely to lead to high rates of pregnancy failures in ewe lambs. After characterising where reproductive losses occurred in Merino ewe lambs mated at 8-10 months of age, we tested the hypothesis that pregnancy failure in ewe lambs is influenced by nutrition and liveweight change around conception and the genetic potential for growth of the ewe lamb. Two-hundred and twenty-four Merino ewe lambs born from 10 sires with Australian Sheep Breeding Values were teased for 14 days using vasectomised rams, and then fed two different diets for 68 days during mating. All ewe lambs were weighed and the appearance of crayon marks on their rump was recorded most days. Blood samples for progesterone assay were collected on Days 5, 12 and 17 after the first record of a crayon mark. Ultrasonography using a trans-rectal probe was used to measure the number of corpora lutea present, as a proxy for ovulation rate, 9 days after the first record of a crayon mark during the mating period. A further trans-rectal ultrasonography was undertaken 30 days after marking from the entire ram to determine pregnancy status and count the number of embryos. Over the entire mating period 54% of ewe lambs were pregnant with 66 fetuses per 100 ewes mated. The average ovulation rate was 150% however up to 84% of this potential was lost by weaning and the major contributor to this apparent deficit was the loss that occurred during the first 17 days after mating. Pregnancy failure was not significantly related to nutrition or liveweight change during mating however, there were significant differences in pregnancy failure between different sire groups. Pregnancy failure was significantly less for ewe lambs from sires with higher breeding values for weight and fat at post-weaning age (8-10 months). Only 60% of ewe lambs had achieved puberty when rams were introduced and only 83% by 35 days after mating. In addition, almost half of the ewe lambs that were mated for the first time during the first 35 days after rams were introduced, but failed to get pregnant, then seemed to skip a cycle or did not cycle again before the end of the 68-day mating period. Liveweight at introduction of entire rams was positively related to fertility, ovulation rate and reproductive rate. This study confirms that selection of sires with higher breeding values for post-weaning weight and fat will increase the fertility and reproductive rate of Merino ewe lambs mated at 8-10 months. This response is due in part to enhancing the onset of puberty and increasing the proportion of ewe lambs cycling at the start of mating and reducing pregnancy failure. © CSIRO 2014. 650 $aCOMPORTAMIENTO REPRODUCTIVO 650 $aCORDEROS 650 $aMERINO 650 $aOVINOS 700 1 $aFERGUSON, M.B. 700 1 $aFERRIO, S. 700 1 $aJONES, C. 700 1 $aKEARNEY, G.A. 700 1 $aKENYON, P.R. 700 1 $aMACLEAY, C. 700 1 $aVIÑOLES, C. 700 1 $aTHOMPSON, A.N. 773 $tAnimal Production Science, 2014$gv.54, no.6, p.762-772.
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