| |
|
|
 | Acceso al texto completo restringido a Biblioteca INIA Treinta y Tres. Por información adicional contacte bibliott@inia.org.uy. |
|
Registro completo
|
|
Biblioteca (s) : |
INIA Treinta y Tres. |
|
Fecha : |
19/05/2016 |
|
Actualizado : |
10/10/2019 |
|
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
|
Autor : |
SINCLAIR, K.D.; YULDIZ, S.; QUINTANS, G.; GEBBIE, F.E.; BROADBENT, P.J. |
|
Afiliación : |
Scottish Agricultural College, Aberdeen.; Scottish Agricultural College, Aberdeen; GRACIELA QUINTANS ILARIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. Stottish Agricultural College, Aberdeen.; Scottish Agricultural College, Aberdeen.; Scottish Agricultural College, Aberdeen. |
|
Título : |
Annual energy intake and the metabolic and reproductive performance of beef cows differing in body size and milk potential. |
|
Fecha de publicación : |
1998 |
|
Fuente / Imprenta : |
Animal Science, 1998, v. 66, p. 657-666. |
|
DOI : |
10.1017/S135772980000922X |
|
Idioma : |
Inglés |
|
Contenido : |
The metabolic status and reproductive performance of four pure breeds of beef cow (small size and low milk potential, Aberdeen Angus; small size and high milk potential, Welsh Black; large size and low milk potential, Charolais; and large size and high milk potential, Simmental) were monitored during their first two parities. Heifers from each breed were allocated to one of two levels of annual energy intake relative to metabolic body weight (M075) (mean daily intakes equivalent to 705 and 820 kj/kg M0·75) in a factorial design. In the 1st year 64 heifers (eight per treatment) which had calved as a consequence of first or second service were selected for the experiment. In the 2nd year 40 of these animals (five per treatment) which held to first or second service remained on experiment. Animals were housed all year round and given diets designed to represent energy intakes while grazing during the summer and conserved feeding during the winter. Pregnancy was established in late July of each year using a combination of oestrous synchronization and artificial insemination. Blood samples were collected at monthly intervals from weaning in November until calving in May; three times weekly from calving until oestrous synchronization (11 weeks later); and fortnightly thereafter until weaning.
For the annual levels of dietary energy intake offered, two breeds (Welsh Black and Charolais) exhibited relatively high growth rates and had the longest post-partum anovulatory periods; and Charolais cows also had the poorest conception rates of all breeds. Relatively lean cows at calving (body condition score < 2·5 units) were sensitive, in terms of the duration of the anovulatory period, to live-weight loss during the early post-partum period, particularly when blood glucose levels were low, whereas relatively fat cows at calving (body condition score > 2·5 units) were not. The data suggest: (i) that mechanisms controlling the anabolic processes governing maternal growth are antagonistic towards those that control reproduction; and (ii) the catabolism of lean tissue rather than fat tissue during the early post-partum period is also antagonistic towards the mechanisms that govern reproductive function in cows. MenosThe metabolic status and reproductive performance of four pure breeds of beef cow (small size and low milk potential, Aberdeen Angus; small size and high milk potential, Welsh Black; large size and low milk potential, Charolais; and large size and high milk potential, Simmental) were monitored during their first two parities. Heifers from each breed were allocated to one of two levels of annual energy intake relative to metabolic body weight (M075) (mean daily intakes equivalent to 705 and 820 kj/kg M0·75) in a factorial design. In the 1st year 64 heifers (eight per treatment) which had calved as a consequence of first or second service were selected for the experiment. In the 2nd year 40 of these animals (five per treatment) which held to first or second service remained on experiment. Animals were housed all year round and given diets designed to represent energy intakes while grazing during the summer and conserved feeding during the winter. Pregnancy was established in late July of each year using a combination of oestrous synchronization and artificial insemination. Blood samples were collected at monthly intervals from weaning in November until calving in May; three times weekly from calving until oestrous synchronization (11 weeks later); and fortnightly thereafter until weaning.
For the annual levels of dietary energy intake offered, two breeds (Welsh Black and Charolais) exhibited relatively high growth rates and had the longest post-partum anovulatory periods; and... Presentar Todo |
|
Palabras claves : |
BEEF COWS; ENERGY INTAKE; GENOTYPES; METABOLITES; REPRODUCTION. |
|
Thesagro : |
BOVINOS DE CARNE; CONSUMO DE ENERGIA; GENOTIPOS; METABOLITOS; REPRODUCCION ANIMAL. |
|
Asunto categoría : |
-- |
|
Marc : |
LEADER 03109naa a2200301 a 4500
001 1054828
005 2019-10-10
008 1998 bl uuuu u00u1 u #d
024 7 $a10.1017/S135772980000922X$2DOI
100 1 $aSINCLAIR, K.D.
245 $aAnnual energy intake and the metabolic and reproductive performance of beef cows differing in body size and milk potential.$h[electronic resource]
260 $c1998
520 $aThe metabolic status and reproductive performance of four pure breeds of beef cow (small size and low milk potential, Aberdeen Angus; small size and high milk potential, Welsh Black; large size and low milk potential, Charolais; and large size and high milk potential, Simmental) were monitored during their first two parities. Heifers from each breed were allocated to one of two levels of annual energy intake relative to metabolic body weight (M075) (mean daily intakes equivalent to 705 and 820 kj/kg M0·75) in a factorial design. In the 1st year 64 heifers (eight per treatment) which had calved as a consequence of first or second service were selected for the experiment. In the 2nd year 40 of these animals (five per treatment) which held to first or second service remained on experiment. Animals were housed all year round and given diets designed to represent energy intakes while grazing during the summer and conserved feeding during the winter. Pregnancy was established in late July of each year using a combination of oestrous synchronization and artificial insemination. Blood samples were collected at monthly intervals from weaning in November until calving in May; three times weekly from calving until oestrous synchronization (11 weeks later); and fortnightly thereafter until weaning. For the annual levels of dietary energy intake offered, two breeds (Welsh Black and Charolais) exhibited relatively high growth rates and had the longest post-partum anovulatory periods; and Charolais cows also had the poorest conception rates of all breeds. Relatively lean cows at calving (body condition score < 2·5 units) were sensitive, in terms of the duration of the anovulatory period, to live-weight loss during the early post-partum period, particularly when blood glucose levels were low, whereas relatively fat cows at calving (body condition score > 2·5 units) were not. The data suggest: (i) that mechanisms controlling the anabolic processes governing maternal growth are antagonistic towards those that control reproduction; and (ii) the catabolism of lean tissue rather than fat tissue during the early post-partum period is also antagonistic towards the mechanisms that govern reproductive function in cows.
650 $aBOVINOS DE CARNE
650 $aCONSUMO DE ENERGIA
650 $aGENOTIPOS
650 $aMETABOLITOS
650 $aREPRODUCCION ANIMAL
653 $aBEEF COWS
653 $aENERGY INTAKE
653 $aGENOTYPES
653 $aMETABOLITES
653 $aREPRODUCTION
700 1 $aYULDIZ, S.
700 1 $aQUINTANS, G.
700 1 $aGEBBIE, F.E.
700 1 $aBROADBENT, P.J.
773 $tAnimal Science, 1998$gv. 66, p. 657-666.
Descargar
Esconder MarcPresentar Marc Completo |
|
Registro original : |
INIA Treinta y Tres (TT) |
|
|
Biblioteca
|
Identificación
|
Origen
|
Tipo / Formato
|
Clasificación
|
Cutter
|
Registro
|
Volumen
|
Estado
|
Volver
|
|
|
| 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. |
|
Fecha actual : |
03/12/2018 |
|
Actualizado : |
24/06/2021 |
|
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
|
Circulación / Nivel : |
Internacional - -- |
|
Autor : |
BASUALDO, M.; HUYKMAN, N.; VOLANTE, J. N.; PARUELO, J.; PIÑEIRO, G. |
|
Afiliación : |
M. BASUALDO, IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Argentina.; Instituto de Silvicultura y Manejo de Bosques (INSIMA), Facultad de Ciencias Forestales, Universidad Nacional de Santiago del Estero (UNSE), Argentina; N.HUYKMAN, IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Argentina; J. N. VOLANTE, Laboratorio de Teledetección y SIG INTA Salta, Argentina.; JOSÉ PARUELO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.; IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Argentina.; G. PIÑEIRO, IFEVA, Universidad de Buenos Aires, CONICET, Facultad de Agronomía, Argentina. |
|
Título : |
Lost forever? Ecosystem functional changes occurring after agricultural abandonment and forest recovery in the semiarid Chaco forests. |
|
Fecha de publicación : |
2018 |
|
Fuente / Imprenta : |
Science of the Total Environment, 10 February 2019, v. 650, pages 1537-1546. |
|
ISSN : |
0048-9697 |
|
DOI : |
10.1016/j.scitotenv.2018.09.001 |
|
Idioma : |
Inglés |
|
Notas : |
Article history: Received 13 March 2018 // Received in revised form 1 September 2018 // Accepted 1 September 2018 // Available online 03 September 2018.
Editor: Elena PAOLETTI.
We thank the Laboratorio de Análisis Regional y Teledetección (LART) and Laboratorio de Teledetección y SIG -INTA Cerrillos. This research was supported by CONICET , UBACYT 20020110100156 , PICTO-2014-0097 and PICT 1082 . This work was carried out with the aid of a grant from the Inter-American Institute for Global Change Research (IAI) CRN III 3095, which is supported by the US National Science Foundation (Grant GEO-1128040 ). |
|
Contenido : |
ABSTRACT.
Semiarid forests are worldwide threatened by land use changes, particularly agriculture. However, in some cases, due to particular economic or social processes, agriculture ends and forests may or may not recover to their original state. Using different databases and satellite images integrated into a geographical information system, we located in the central region of the semiarid Chaco forests of Argentina adjacent land use patches of secondary forest (SF), remnant forest (RF) and crops (CP). Using a chronosequence approach, we evaluated changes in the fraction of the photosynthetic active radiation absorbed by the vegetation (FAPAR) between SF and RF and CP, using the enhanced vegetation index (EVI). We evaluated both intra and inter-annual changes in EVI mean (EVImean), EVI maximum (EVImax), EVI minimum (EVImin), and EVI relative range (EVIrr) as descriptors of FAPAR dynamics and analyzed their changes through time (2000 to 2010) and their relation to rainfall. Secondary forests showed higher seasonality and higher EVImean values than RF, but differences disappeared as time since agricultural abandonment increased, suggesting that SF recover their functioning (when compared to RF) after 10 to 15 years. Our results suggest that Chaco's SF have intermediate seasonal patterns in-between RF and CP, as expected by successional theory, and that FAPAR interception by RF appears to be dependent on previous year's precipitation. We found that, although all land uses showed similar precipitation use efficiency (PUE), SF and cropland's productivity were less stable across the years and showed faster increases or decreases compared to RF, depending on precipitation (higher precipitation marginal response- PMR). Our results suggest that at least some aspects of ecosystem functioning can be restored after agricultural abandonment. Future research that combines floristic and structural changes is necessary to fully understand secondary forests regrowth process after agricultural abandonment in the Chaco region.
© 2018 Elsevier B.V. MenosABSTRACT.
Semiarid forests are worldwide threatened by land use changes, particularly agriculture. However, in some cases, due to particular economic or social processes, agriculture ends and forests may or may not recover to their original state. Using different databases and satellite images integrated into a geographical information system, we located in the central region of the semiarid Chaco forests of Argentina adjacent land use patches of secondary forest (SF), remnant forest (RF) and crops (CP). Using a chronosequence approach, we evaluated changes in the fraction of the photosynthetic active radiation absorbed by the vegetation (FAPAR) between SF and RF and CP, using the enhanced vegetation index (EVI). We evaluated both intra and inter-annual changes in EVI mean (EVImean), EVI maximum (EVImax), EVI minimum (EVImin), and EVI relative range (EVIrr) as descriptors of FAPAR dynamics and analyzed their changes through time (2000 to 2010) and their relation to rainfall. Secondary forests showed higher seasonality and higher EVImean values than RF, but differences disappeared as time since agricultural abandonment increased, suggesting that SF recover their functioning (when compared to RF) after 10 to 15 years. Our results suggest that Chaco's SF have intermediate seasonal patterns in-between RF and CP, as expected by successional theory, and that FAPAR interception by RF appears to be dependent on previous year's precipitation. We found that, although all land uses sho... Presentar Todo |
|
Palabras claves : |
CROPS; FRACTION OF ABSORBED PHOTOSYNTHETICALLY ACTIVE RADIATION; REMNANT FOREST; REMOTE SENSING; SECONDARY FOREST. |
|
Thesagro : |
ARGENTINA; SILVICULTURA. |
|
Asunto categoría : |
-- |
|
Marc : |
LEADER 03592naa a2200289 a 4500
001 1059328
005 2021-06-24
008 2018 bl uuuu u00u1 u #d
022 $a0048-9697
024 7 $a10.1016/j.scitotenv.2018.09.001$2DOI
100 1 $aBASUALDO, M.
245 $aLost forever? Ecosystem functional changes occurring after agricultural abandonment and forest recovery in the semiarid Chaco forests.$h[electronic resource]
260 $c2018
500 $aArticle history: Received 13 March 2018 // Received in revised form 1 September 2018 // Accepted 1 September 2018 // Available online 03 September 2018. Editor: Elena PAOLETTI. We thank the Laboratorio de Análisis Regional y Teledetección (LART) and Laboratorio de Teledetección y SIG -INTA Cerrillos. This research was supported by CONICET , UBACYT 20020110100156 , PICTO-2014-0097 and PICT 1082 . This work was carried out with the aid of a grant from the Inter-American Institute for Global Change Research (IAI) CRN III 3095, which is supported by the US National Science Foundation (Grant GEO-1128040 ).
520 $aABSTRACT. Semiarid forests are worldwide threatened by land use changes, particularly agriculture. However, in some cases, due to particular economic or social processes, agriculture ends and forests may or may not recover to their original state. Using different databases and satellite images integrated into a geographical information system, we located in the central region of the semiarid Chaco forests of Argentina adjacent land use patches of secondary forest (SF), remnant forest (RF) and crops (CP). Using a chronosequence approach, we evaluated changes in the fraction of the photosynthetic active radiation absorbed by the vegetation (FAPAR) between SF and RF and CP, using the enhanced vegetation index (EVI). We evaluated both intra and inter-annual changes in EVI mean (EVImean), EVI maximum (EVImax), EVI minimum (EVImin), and EVI relative range (EVIrr) as descriptors of FAPAR dynamics and analyzed their changes through time (2000 to 2010) and their relation to rainfall. Secondary forests showed higher seasonality and higher EVImean values than RF, but differences disappeared as time since agricultural abandonment increased, suggesting that SF recover their functioning (when compared to RF) after 10 to 15 years. Our results suggest that Chaco's SF have intermediate seasonal patterns in-between RF and CP, as expected by successional theory, and that FAPAR interception by RF appears to be dependent on previous year's precipitation. We found that, although all land uses showed similar precipitation use efficiency (PUE), SF and cropland's productivity were less stable across the years and showed faster increases or decreases compared to RF, depending on precipitation (higher precipitation marginal response- PMR). Our results suggest that at least some aspects of ecosystem functioning can be restored after agricultural abandonment. Future research that combines floristic and structural changes is necessary to fully understand secondary forests regrowth process after agricultural abandonment in the Chaco region. © 2018 Elsevier B.V.
650 $aARGENTINA
650 $aSILVICULTURA
653 $aCROPS
653 $aFRACTION OF ABSORBED PHOTOSYNTHETICALLY ACTIVE RADIATION
653 $aREMNANT FOREST
653 $aREMOTE SENSING
653 $aSECONDARY FOREST
700 1 $aHUYKMAN, N.
700 1 $aVOLANTE, J. N.
700 1 $aPARUELO, J.
700 1 $aPIÑEIRO, G.
773 $tScience of the Total Environment, 10 February 2019$gv. 650, pages 1537-1546.
Descargar
Esconder MarcPresentar Marc Completo |
|
Registro original : |
INIA Las Brujas (LB) |
|
|
Biblioteca
|
Identificación
|
Origen
|
Tipo / Formato
|
Clasificación
|
Cutter
|
Registro
|
Volumen
|
Estado
|
Volver
|
| Expresión de búsqueda válido. Check! |
|
|
