|
|
| Acceso al texto completo restringido a Biblioteca INIA Tacuarembó. Por información adicional contacte bibliotb@tb.inia.org.uy. |
Registro completo
|
Biblioteca (s) : |
INIA Tacuarembó. |
Fecha : |
14/03/2017 |
Actualizado : |
13/01/2020 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Autor : |
VAN LIER, E.; HART, K.W.; VIÑOLES, C.; PAGANONI, B.; BLACHE, D. |
Afiliación : |
E. VAN LIER, Universidad de la República (UdelaR)/ Facultad de Agronomía; K. W. HART; CAROLINA VIÑOLES GIL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; B. PAGANONI; D. BLACHE. |
Título : |
Calm Merino ewes have a higher ovulation rate and more multiple pregnancies than nervous ewes. |
Fecha de publicación : |
2017 |
Fuente / Imprenta : |
Animal, 2017, v. 11, no. 7, p. 1196-1202. |
DOI : |
10.1017/S1751731117000106 |
Idioma : |
Inglés |
Notas : |
Article history: Received 15 June 2016; Accepted 13 December 2016. |
Contenido : |
In 1990, two selection lines of Merino sheep were established for low and high behavioural reactivity (calm and nervous temperament) at the University of Western Australia. Breeding records consistently showed that calm ewes weaned 10% to 19% more lambs than the nervous ewes. We hypothesise that calm ewes could have a higher ovulation rate than nervous ewes and/or calm ewes could have a lower rate of embryo mortality than nervous ewes. We tested these hypotheses by comparing the ovulation rate and the rate of embryo mortality between the calm and nervous lines before and after synchronisation and artificial insemination. Merino ewes from the temperament selection lines (calm, n = 100; nervous, n = 100) were synchronised (early breeding season) for artificial insemination (day 0) (intravaginal sponges containing fluogestone acetate and eCG immediately after sponge withdrawal). On day-17 and 11 ovarian cyclicity and corpora lutea, and on days 30 and 74 pregnancies and embryos/foetuses were determined by ultrasound. Progesterone, insulin and leptin concentrations were determined in blood plasma samples from days 5, 12 and 17. Ovarian cyclicity before and after oestrus synchronisation did not differ between the lines, but ovulation rate did (day-17: calm 1.63; nervous 1.26; P<0.01; day 11: calm 1.83; nervous 1.57; P<0.05). Ovulation rate on day 11 in nervous ewes was higher than on day-17. Loss of embryos by day 30 was high (calm: 71/150; nervous: 68/130); but nervous ewes had a lower proportion (15/47) of multiple pregnancies compared with calm ewes (30/46; P<0.01). Reproductive loss between days 30 and 74 represented 7.3% of the overall loss. Temperament did not affect concentrations of progesterone, but nervous ewes had higher insulin (32.0 pmol/l ± 1.17 SEM; P = 0.013) and lower leptin (1.18 μg/l ± 0.04 SEM; P = 0.002) concentrations than calm ewes (insulin: 27.8 pmol/l ± 1.17 SEM; leptin: 1.35 μg/l ± 0.04 SEM). The differences in reproductive outcomes between the calm and nervous ewes were mainly due to a higher ovulation rate in calm ewes. We suggest that reproduction in nervous ewes is compromised by factors leading up to ovulation and conception, or the uterine environment during early pregnancy, that reflect differences in energy utilisation. MenosIn 1990, two selection lines of Merino sheep were established for low and high behavioural reactivity (calm and nervous temperament) at the University of Western Australia. Breeding records consistently showed that calm ewes weaned 10% to 19% more lambs than the nervous ewes. We hypothesise that calm ewes could have a higher ovulation rate than nervous ewes and/or calm ewes could have a lower rate of embryo mortality than nervous ewes. We tested these hypotheses by comparing the ovulation rate and the rate of embryo mortality between the calm and nervous lines before and after synchronisation and artificial insemination. Merino ewes from the temperament selection lines (calm, n = 100; nervous, n = 100) were synchronised (early breeding season) for artificial insemination (day 0) (intravaginal sponges containing fluogestone acetate and eCG immediately after sponge withdrawal). On day-17 and 11 ovarian cyclicity and corpora lutea, and on days 30 and 74 pregnancies and embryos/foetuses were determined by ultrasound. Progesterone, insulin and leptin concentrations were determined in blood plasma samples from days 5, 12 and 17. Ovarian cyclicity before and after oestrus synchronisation did not differ between the lines, but ovulation rate did (day-17: calm 1.63; nervous 1.26; P<0.01; day 11: calm 1.83; nervous 1.57; P<0.05). Ovulation rate on day 11 in nervous ewes was higher than on day-17. Loss of embryos by day 30 was high (calm: 71/150; nervous: 68/130); but nervous ewes had a... Presentar Todo |
Palabras claves : |
EMBRYO; INSULIN; LEPTIN; OVIS ARIES; PROGESTERONE. |
Thesagro : |
OVINOS. |
Asunto categoría : |
L01 Ganadería |
Marc : |
LEADER 03073naa a2200265 a 4500 001 1056829 005 2020-01-13 008 2017 bl uuuu u00u1 u #d 024 7 $a10.1017/S1751731117000106$2DOI 100 1 $aVAN LIER, E. 245 $aCalm Merino ewes have a higher ovulation rate and more multiple pregnancies than nervous ewes.$h[electronic resource] 260 $c2017 500 $aArticle history: Received 15 June 2016; Accepted 13 December 2016. 520 $aIn 1990, two selection lines of Merino sheep were established for low and high behavioural reactivity (calm and nervous temperament) at the University of Western Australia. Breeding records consistently showed that calm ewes weaned 10% to 19% more lambs than the nervous ewes. We hypothesise that calm ewes could have a higher ovulation rate than nervous ewes and/or calm ewes could have a lower rate of embryo mortality than nervous ewes. We tested these hypotheses by comparing the ovulation rate and the rate of embryo mortality between the calm and nervous lines before and after synchronisation and artificial insemination. Merino ewes from the temperament selection lines (calm, n = 100; nervous, n = 100) were synchronised (early breeding season) for artificial insemination (day 0) (intravaginal sponges containing fluogestone acetate and eCG immediately after sponge withdrawal). On day-17 and 11 ovarian cyclicity and corpora lutea, and on days 30 and 74 pregnancies and embryos/foetuses were determined by ultrasound. Progesterone, insulin and leptin concentrations were determined in blood plasma samples from days 5, 12 and 17. Ovarian cyclicity before and after oestrus synchronisation did not differ between the lines, but ovulation rate did (day-17: calm 1.63; nervous 1.26; P<0.01; day 11: calm 1.83; nervous 1.57; P<0.05). Ovulation rate on day 11 in nervous ewes was higher than on day-17. Loss of embryos by day 30 was high (calm: 71/150; nervous: 68/130); but nervous ewes had a lower proportion (15/47) of multiple pregnancies compared with calm ewes (30/46; P<0.01). Reproductive loss between days 30 and 74 represented 7.3% of the overall loss. Temperament did not affect concentrations of progesterone, but nervous ewes had higher insulin (32.0 pmol/l ± 1.17 SEM; P = 0.013) and lower leptin (1.18 μg/l ± 0.04 SEM; P = 0.002) concentrations than calm ewes (insulin: 27.8 pmol/l ± 1.17 SEM; leptin: 1.35 μg/l ± 0.04 SEM). The differences in reproductive outcomes between the calm and nervous ewes were mainly due to a higher ovulation rate in calm ewes. We suggest that reproduction in nervous ewes is compromised by factors leading up to ovulation and conception, or the uterine environment during early pregnancy, that reflect differences in energy utilisation. 650 $aOVINOS 653 $aEMBRYO 653 $aINSULIN 653 $aLEPTIN 653 $aOVIS ARIES 653 $aPROGESTERONE 700 1 $aHART, K.W. 700 1 $aVIÑOLES, C. 700 1 $aPAGANONI, B. 700 1 $aBLACHE, D. 773 $tAnimal, 2017$gv. 11, no. 7, p. 1196-1202.
Descargar
Esconder MarcPresentar Marc Completo |
Registro original : |
INIA Tacuarembó (TBO) |
|
Biblioteca
|
Identificación
|
Origen
|
Tipo / Formato
|
Clasificación
|
Cutter
|
Registro
|
Volumen
|
Estado
|
Volver
|
|
| Acceso al texto completo restringido a Biblioteca INIA La Estanzuela. Por información adicional contacte bib_le@inia.org.uy. |
Registro completo
|
Biblioteca (s) : |
INIA La Estanzuela; INIA Tacuarembó. |
Fecha actual : |
11/05/2020 |
Actualizado : |
27/01/2021 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Circulación / Nivel : |
Internacional - -- |
Autor : |
LÓPEZ-GONZÁLEZ, F.A.; RODRIGO ALLENDE, R.; SOARES DE LIMA, J.M.; CANOZZI, M.E.A.; GIL, A.; BARCELLOS, J.O.J. |
Afiliación : |
FREDY ANDREY LÓPEZ-GONZÁLEZ, Department of Animal Science, Federal University of Rio Grande do Sul, 7.712 Bento Gonçalves Ave., Porto Alegre, Rio Grande do Sul 91540-000, Brazil.; RODRIGO ALLENDE, Department of Animal Science, Faculty of Veterinary Sciences, University of Concepción, Chillán, Chile.; JUAN MANUEL SOARES DE LIMA LAPETINA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARÍA EUGENIA ANDRIGHETTO CANOZZI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; AMIR GIL, Sessim Department of Animal Science, Federal University of Rio Grande do Sul, 7.712 Bento Gonçalves Ave., Porto Alegre, Rio Grande do Sul 91540-000, Brazil.; JÚLIO OTÁVIO JARDIM BARCELLOS, Department of Animal Science, Federal University of Rio Grande do Sul, 7.712 Bento Gonçalves Ave., Porto Alegre, Rio Grande do Sul 91540-000, Brazil. |
Título : |
Intensification of cow-calf production: How does the system respond biologically to energy inputs in a long-term horizon?. |
Fecha de publicación : |
2020 |
Fuente / Imprenta : |
Livestock Science, Volume 237, July 2020, 104058. Doi: https://doi.org/10.1016/j.livsci.2020.104058. |
DOI : |
10.1016/j.livsci.2020.104058 |
Idioma : |
Inglés |
Notas : |
Article history: Received 21 August 2019// Received in revised form 22 March 2020// Accepted 9 April 2020 //Available online 26 April 2020- Corresponding author. E-mail address: julio.barcellos@ufrgs.br (J.O.J. Barcellos).This study was ?nanced in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) Finance Code 001. |
Contenido : |
Abstract:
In southern Brazil, beef cattle production systems generally rely on grazing on natural pastures. However, their forage production, and consequently metabolizable energy (ME) production, is seasonal and influenced by climatic events. Thus, there is a scientific and commercial interest in evaluating and understanding the biological impacts of intensification using pasture irrigation and the effects of El Niño-Southern Oscillation (ENSO) phenomena on the long term on the productivity of cow-calf systems. Therefore, our objective was to develop a simulation model to evaluate the effects of intensification levels, using cultivated pastures and irrigation, on the productivity and on the efficiency metabolizable energy utilization of beef cow-calf systems in a 10-year horizon. This period allows capturing the effects of several production cycles as influenced by ENSO events. The model includes three submodels: herd structure, herd ME requirements, and forage ME production. The results of the present study demonstrate that the proposed model is able to evaluate the influence of intensification of grazing systems on metabolizable energy production, carrying capacity, productivity and biological efficiency of beef cow-calf systems over a long-term horizon. Productivity was increased in 15.9% when 20% of the grazing area was intensified and irrigated compared with the modeled non-intensified system, independently of climatic events. The main productive response was the increase in the number of dams in the herd, especially as a result of the use of irrigation. This study proposes different alternatives for increasing the productivity of beef cow-calf systems in southern Brazil. MenosAbstract:
In southern Brazil, beef cattle production systems generally rely on grazing on natural pastures. However, their forage production, and consequently metabolizable energy (ME) production, is seasonal and influenced by climatic events. Thus, there is a scientific and commercial interest in evaluating and understanding the biological impacts of intensification using pasture irrigation and the effects of El Niño-Southern Oscillation (ENSO) phenomena on the long term on the productivity of cow-calf systems. Therefore, our objective was to develop a simulation model to evaluate the effects of intensification levels, using cultivated pastures and irrigation, on the productivity and on the efficiency metabolizable energy utilization of beef cow-calf systems in a 10-year horizon. This period allows capturing the effects of several production cycles as influenced by ENSO events. The model includes three submodels: herd structure, herd ME requirements, and forage ME production. The results of the present study demonstrate that the proposed model is able to evaluate the influence of intensification of grazing systems on metabolizable energy production, carrying capacity, productivity and biological efficiency of beef cow-calf systems over a long-term horizon. Productivity was increased in 15.9% when 20% of the grazing area was intensified and irrigated compared with the modeled non-intensified system, independently of climatic events. The main productive response was the incre... Presentar Todo |
Palabras claves : |
BIOLOGICAL EFFICENCY; EL NIÑO-SOUTHERN OSCILLATION(ENSO); HERD STRUCTURE; INTENSIFICACIÓN DE LA PRODUCCIÓN; IRRIGATION MODELING. |
Asunto categoría : |
L01 Ganadería |
Marc : |
LEADER 02980naa a2200265 a 4500 001 1061050 005 2021-01-27 008 2020 bl uuuu u00u1 u #d 024 7 $a10.1016/j.livsci.2020.104058$2DOI 100 1 $aLÓPEZ-GONZÁLEZ, F.A. 245 $aIntensification of cow-calf production$bHow does the system respond biologically to energy inputs in a long-term horizon?.$h[electronic resource] 260 $c2020 500 $aArticle history: Received 21 August 2019// Received in revised form 22 March 2020// Accepted 9 April 2020 //Available online 26 April 2020- Corresponding author. E-mail address: julio.barcellos@ufrgs.br (J.O.J. Barcellos).This study was ?nanced in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) Finance Code 001. 520 $aAbstract: In southern Brazil, beef cattle production systems generally rely on grazing on natural pastures. However, their forage production, and consequently metabolizable energy (ME) production, is seasonal and influenced by climatic events. Thus, there is a scientific and commercial interest in evaluating and understanding the biological impacts of intensification using pasture irrigation and the effects of El Niño-Southern Oscillation (ENSO) phenomena on the long term on the productivity of cow-calf systems. Therefore, our objective was to develop a simulation model to evaluate the effects of intensification levels, using cultivated pastures and irrigation, on the productivity and on the efficiency metabolizable energy utilization of beef cow-calf systems in a 10-year horizon. This period allows capturing the effects of several production cycles as influenced by ENSO events. The model includes three submodels: herd structure, herd ME requirements, and forage ME production. The results of the present study demonstrate that the proposed model is able to evaluate the influence of intensification of grazing systems on metabolizable energy production, carrying capacity, productivity and biological efficiency of beef cow-calf systems over a long-term horizon. Productivity was increased in 15.9% when 20% of the grazing area was intensified and irrigated compared with the modeled non-intensified system, independently of climatic events. The main productive response was the increase in the number of dams in the herd, especially as a result of the use of irrigation. This study proposes different alternatives for increasing the productivity of beef cow-calf systems in southern Brazil. 653 $aBIOLOGICAL EFFICENCY 653 $aEL NIÑO-SOUTHERN OSCILLATION(ENSO) 653 $aHERD STRUCTURE 653 $aINTENSIFICACIÓN DE LA PRODUCCIÓN 653 $aIRRIGATION MODELING 700 1 $aRODRIGO ALLENDE, R. 700 1 $aSOARES DE LIMA, J.M. 700 1 $aCANOZZI, M.E.A. 700 1 $aGIL, A. 700 1 $aBARCELLOS, J.O.J. 773 $tLivestock Science, Volume 237, July 2020, 104058. Doi: https://doi.org/10.1016/j.livsci.2020.104058.
Descargar
Esconder MarcPresentar Marc Completo |
Registro original : |
INIA La Estanzuela (LE) |
|
Biblioteca
|
Identificación
|
Origen
|
Tipo / Formato
|
Clasificación
|
Cutter
|
Registro
|
Volumen
|
Estado
|
Volver
|
Expresión de búsqueda válido. Check! |
|
|