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Registro completo
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Biblioteca (s) : |
INIA Tacuarembó; INIA Treinta y Tres. |
Fecha : |
21/02/2014 |
Actualizado : |
16/06/2022 |
Autor : |
HAIRSTON, J.E. (Comp.). |
Afiliación : |
JAMES E. HAIRSTON. |
Título : |
Proceedings. |
Complemento del título : |
Southern Conservation Tillage Conference, 1988 ago 10-12 : Tupelo. |
Fecha de publicación : |
1988 |
Fuente / Imprenta : |
Alabama: MAFES, 1988. |
Páginas : |
88 p. |
Serie : |
(Special Bulletin; 88-1) |
Idioma : |
Inglés |
Notas : |
Bibliografías al final de cada exposición. |
Thesagro : |
ABONOS NITROGENADOS; AGRICULTURA DE BAJO INSUMO; ANALISIS ECONOMICO; CERO-LABRANZA; CONSERVACION DE SUELOS; CONTROL DE LA EROSION; COSTOS; EROSION; EUA; LABRANZA; LABRANZA DE CONSERVACION; LABRANZA MINIMA; MAIZ; MAQUINARIA DE LABRANZA; NECESIDADES DE LAS PLANTAS; NECESIDADES DE NUTRIENTES; PROPIEDADES FISICO-QUIMICAS SUELO; RENTABILIDAD; RESPUESTA DE LA PLANTA; ROTACION DE CULTIVOS; SOJA; SORGHUM. |
Asunto categoría : |
A50 Investigación agraria |
Marc : |
LEADER 01074nam a2200397 a 4500 001 1016591 005 2022-06-16 008 1988 bl uuuu u00u1 u #d 100 1 $aHAIRSTON, J.E. 245 $aProceedings. 260 $aAlabama: MAFES$c1988 300 $a88 p. 490 $a(Special Bulletin; 88-1) 500 $aBibliografías al final de cada exposición. 650 $aABONOS NITROGENADOS 650 $aAGRICULTURA DE BAJO INSUMO 650 $aANALISIS ECONOMICO 650 $aCERO-LABRANZA 650 $aCONSERVACION DE SUELOS 650 $aCONTROL DE LA EROSION 650 $aCOSTOS 650 $aEROSION 650 $aEUA 650 $aLABRANZA 650 $aLABRANZA DE CONSERVACION 650 $aLABRANZA MINIMA 650 $aMAIZ 650 $aMAQUINARIA DE LABRANZA 650 $aNECESIDADES DE LAS PLANTAS 650 $aNECESIDADES DE NUTRIENTES 650 $aPROPIEDADES FISICO-QUIMICAS SUELO 650 $aRENTABILIDAD 650 $aRESPUESTA DE LA PLANTA 650 $aROTACION DE CULTIVOS 650 $aSOJA 650 $aSORGHUM
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INIA Tacuarembó (TBO) |
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| Acceso al texto completo restringido a Biblioteca INIA Las Brujas. Por información adicional contacte bibliolb@inia.org.uy. |
Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
Fecha actual : |
29/01/2024 |
Actualizado : |
29/01/2024 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Circulación / Nivel : |
Internacional - -- |
Autor : |
MARÍN, M.F.; NAYA, H.; ESPASANDIN, A.C.; NAVAJAS, E.; DEVINCENZI, T.; CARRIQUIRY, M. |
Afiliación : |
MARIA F. MARÍN, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Montevideo, Montevideo, 12900, Uruguay; HUGO NAYA, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Montevideo, Montevideo, 12900, Uruguay; Unidad de Bioinformática, Institut Pasteur de Montevideo, Montevideo, Montevideo, 11400, Uruguay; ANA C. ESPASANDIN, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Montevideo, Montevideo, 12900, Uruguay; ELLY ANA NAVAJAS VALENTINI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; THAIS DEVINCENZI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARIANA CARRIQUIRY, Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Montevideo, Montevideo, 12900, Uruguay. |
Título : |
Energy efficiency, reproductive performance, and metabolic parameters of grazing Hereford heifers. |
Fecha de publicación : |
2024 |
Fuente / Imprenta : |
Livestock Science, 2024, Volume 279, e105389. https://doi.org/10.1016/j.livsci.2023.105389 |
ISSN : |
1871-1413 |
DOI : |
10.1016/j.livsci.2023.105389 |
Idioma : |
Inglés |
Notas : |
Article history: Received 21 September 2023; Received in revised form 9 November 2023; Accepted 1 December 2023; Available online 2 December 2023. -- Correspondence: Marín, M.F.; Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Montevideo, Montevideo, Uruguay; email:mfedericamarin@gmail.com -- Funding: This research was partially funded by the Comisión Académica de Posgrados (Uruguay) through the graduate scholarship awarded to M.F. Marín, to the CSIC Reserch Program awarded to M.F. Marin and by the CSIC I + D Research Program (UdelaR) awarded to M. Carriquiry. -- |
Contenido : |
ABSTRACT.- Feed and energy efficiency have been topics of extensive research in recent years, with residual feed intake (RFI) being the preferred index to determine feed efficiency in beef cattle. Nevertheless, the biggest downside of RFI is that its measurement requires accurately determining individual feed intake, which leads to the need to carry out RFI trials in confinement conditions. In this context, residual heat production (RHP), defined as the difference between observed and predicted heat production, presents an alternative to determine efficiency in grazing conditions as it is independent of feed intake. This work aimed to evaluate the repeatability of RHP and study its relationship with metabolic, endocrine, and reproductive variables. Seventy-four Hereford heifers were used, and at the beginning of the experimental period, heifers were 18 ± 0.7-month-old and weighed on average 278 ± 26 kg. Heat production (HP) was determined at the beginning (March to May; fall) and at the end (September to November; spring) of the experiment using the heart rate-O2 pulse technique to classify heifers according with the residual heat production (RHP). Efficient heifers showed lower HP (P < 0.01), ME (P < 0.01), and DM intake (P < 0.01) without differences in retained energy (RE; only in spring). During fall, average daily gain (ADG) was not included in the estimated HP model; therefore, although, as in RFI, RHP should be independent of BW and ADG, a trend for greater ADG and RE was found for efficient when compared with inefficient heifers. Decreased maintenance requirements (NEm and MEm) as well as higher partial efficiency of use of consumed ME (k) were estimated for more efficient heifers (low RHP; HH), while efficient heifers showed an earlier luteal phase and a shorter service-conception interval and calved earlier in the season, probably associated to an earlier development of fat tissue. Excluding glucose, no major differences were found in the plasma metabolites between groups. However, high-efficiency animals showed positive correlations with cholesterol and negative ones with NEFA plasma concentrations during fall. © 2023 MenosABSTRACT.- Feed and energy efficiency have been topics of extensive research in recent years, with residual feed intake (RFI) being the preferred index to determine feed efficiency in beef cattle. Nevertheless, the biggest downside of RFI is that its measurement requires accurately determining individual feed intake, which leads to the need to carry out RFI trials in confinement conditions. In this context, residual heat production (RHP), defined as the difference between observed and predicted heat production, presents an alternative to determine efficiency in grazing conditions as it is independent of feed intake. This work aimed to evaluate the repeatability of RHP and study its relationship with metabolic, endocrine, and reproductive variables. Seventy-four Hereford heifers were used, and at the beginning of the experimental period, heifers were 18 ± 0.7-month-old and weighed on average 278 ± 26 kg. Heat production (HP) was determined at the beginning (March to May; fall) and at the end (September to November; spring) of the experiment using the heart rate-O2 pulse technique to classify heifers according with the residual heat production (RHP). Efficient heifers showed lower HP (P < 0.01), ME (P < 0.01), and DM intake (P < 0.01) without differences in retained energy (RE; only in spring). During fall, average daily gain (ADG) was not included in the estimated HP model; therefore, although, as in RFI, RHP should be independent of BW and ADG, a trend for greater ADG and RE... Presentar Todo |
Palabras claves : |
Beef cattle; Heat production; Reproduction; SISTEMA GANADERO EXTENSIVO - INIA. |
Asunto categoría : |
L53 Fisiología Animal - Reproducción |
Marc : |
LEADER 03594nam a2200253 a 4500 001 1064445 005 2024-01-29 008 2024 bl uuuu u00u1 u #d 022 $a1871-1413 024 7 $a10.1016/j.livsci.2023.105389$2DOI 100 1 $aMARÍN, M.F. 245 $aEnergy efficiency, reproductive performance, and metabolic parameters of grazing Hereford heifers.$h[electronic resource] 260 $aLivestock Science, 2024, Volume 279, e105389. https://doi.org/10.1016/j.livsci.2023.105389$c2023 500 $aArticle history: Received 21 September 2023; Received in revised form 9 November 2023; Accepted 1 December 2023; Available online 2 December 2023. -- Correspondence: Marín, M.F.; Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Montevideo, Montevideo, Uruguay; email:mfedericamarin@gmail.com -- Funding: This research was partially funded by the Comisión Académica de Posgrados (Uruguay) through the graduate scholarship awarded to M.F. Marín, to the CSIC Reserch Program awarded to M.F. Marin and by the CSIC I + D Research Program (UdelaR) awarded to M. Carriquiry. -- 520 $aABSTRACT.- Feed and energy efficiency have been topics of extensive research in recent years, with residual feed intake (RFI) being the preferred index to determine feed efficiency in beef cattle. Nevertheless, the biggest downside of RFI is that its measurement requires accurately determining individual feed intake, which leads to the need to carry out RFI trials in confinement conditions. In this context, residual heat production (RHP), defined as the difference between observed and predicted heat production, presents an alternative to determine efficiency in grazing conditions as it is independent of feed intake. This work aimed to evaluate the repeatability of RHP and study its relationship with metabolic, endocrine, and reproductive variables. Seventy-four Hereford heifers were used, and at the beginning of the experimental period, heifers were 18 ± 0.7-month-old and weighed on average 278 ± 26 kg. Heat production (HP) was determined at the beginning (March to May; fall) and at the end (September to November; spring) of the experiment using the heart rate-O2 pulse technique to classify heifers according with the residual heat production (RHP). Efficient heifers showed lower HP (P < 0.01), ME (P < 0.01), and DM intake (P < 0.01) without differences in retained energy (RE; only in spring). During fall, average daily gain (ADG) was not included in the estimated HP model; therefore, although, as in RFI, RHP should be independent of BW and ADG, a trend for greater ADG and RE was found for efficient when compared with inefficient heifers. Decreased maintenance requirements (NEm and MEm) as well as higher partial efficiency of use of consumed ME (k) were estimated for more efficient heifers (low RHP; HH), while efficient heifers showed an earlier luteal phase and a shorter service-conception interval and calved earlier in the season, probably associated to an earlier development of fat tissue. Excluding glucose, no major differences were found in the plasma metabolites between groups. However, high-efficiency animals showed positive correlations with cholesterol and negative ones with NEFA plasma concentrations during fall. © 2023 653 $aBeef cattle 653 $aHeat production 653 $aReproduction 653 $aSISTEMA GANADERO EXTENSIVO - INIA 700 1 $aNAYA, H. 700 1 $aESPASANDIN, A.C. 700 1 $aNAVAJAS, E. 700 1 $aDEVINCENZI, T. 700 1 $aCARRIQUIRY, M.
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