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Biblioteca (s) : |
INIA La Estanzuela. |
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Fecha : |
31/10/2019 |
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Actualizado : |
31/10/2019 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
CAPELESSO, A.; KOZLOSKI, G.; MENDOZA, A.; PLA, M.; REPETTO, J.; CAJARVILLE, C. |
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Afiliación : |
Departamento de Nutrición Animal, Universidad de la República, Facultad de Veterinaria, San José, Uruguay./Departamento de Zootecnia da Universidade Federal de Santa Maria, Rio Grande do Sul, Brasil.; Departamento de Zootecnia da Universidade Federal de Santa Maria, Rio Grande do Sul, 97105900, Brazil.; ALEJANDRO FRANCISCO MENDOZA AGUIAR, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARCELO PLA TEJERA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; JOSE LUIS REPETTO CAPELLO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay./ Departamento de Producción de Bovinos, Universidad de la República, Facultad de Veterinaria, San José, Uruguay.; CECILIA CAJARVILLE, Departamento de Nutrición Animal, Universidad de la República, Facultad de Veterinaria, San José, Uruguay. |
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Título : |
Reducing milking frequency in early lactation improved the energy status but reduced milk yield during the whole lactation of primiparous Holstein cows consuming a total mixed ration and pasture. |
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Fecha de publicación : |
2019 |
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Fuente / Imprenta : |
Journal of Dairy Science, October 2019, Volume 102, Issue 10, Pages 8919-8930. |
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DOI : |
10.3168/jds.2019-16629 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received March 15, 2019. / Accepted June 21, 2019. |
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Contenido : |
Abstract:
To investigate the immediate and long-term performance effects of milking frequency during early lactation of primiparous dairy cows consuming a total mixed ration and pasture, 20 Holstein cows were assigned in a randomized block design to either once-daily (1×) or twice-daily (2×) milking during the first 8 wk of lactation (treatment period). After the treatment period, all cows were milked 2× until wk 43 of lactation. Cows were fed a total mixed ration (approximately 15 kg of DM/cow per day) and allowed to graze an oat pasture (Avena sativa). Dry matter intake was 19.1 kg of DM/cow per day on average and was not affected by treatments. Milk yield was 40% lower in cows milked 1× during the treatment period, and a carryover effect existed until wk 21 of lactation, resulting in a final reduction of 15% of milk yield in the whole lactation. Milk lactose concentration decreased, whereas fat and protein concentrations increased for cows milked 1×. Mobilization of energy reserves during the treatment period occurred in both groups, but cows milked 1× showed greater body condition score and greater backfat thickness. In conclusion, milking 1× during the first 8 wk of lactation resulted in immediate and carryover negative effects on milk and milk solid yield without affecting feed intake, resulting in the improved energy status of primiparous dairy cows. |
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Palabras claves : |
DAIRY COWS; GRAZING; ONCE-DAILY MILKING; ORDEÑE UNA VEZ AL DIA; VACA HOLSTEIN. |
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Thesagro : |
LECHERÍA; VACAS LECHERAS. |
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Asunto categoría : |
L01 Ganadería |
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Marc : |
LEADER 02386naa a2200289 a 4500
001 1060374
005 2019-10-31
008 2019 bl uuuu u00u1 u #d
024 7 $a10.3168/jds.2019-16629$2DOI
100 1 $aCAPELESSO, A.
245 $aReducing milking frequency in early lactation improved the energy status but reduced milk yield during the whole lactation of primiparous Holstein cows consuming a total mixed ration and pasture.$h[electronic resource]
260 $c2019
500 $aArticle history: Received March 15, 2019. / Accepted June 21, 2019.
520 $aAbstract: To investigate the immediate and long-term performance effects of milking frequency during early lactation of primiparous dairy cows consuming a total mixed ration and pasture, 20 Holstein cows were assigned in a randomized block design to either once-daily (1×) or twice-daily (2×) milking during the first 8 wk of lactation (treatment period). After the treatment period, all cows were milked 2× until wk 43 of lactation. Cows were fed a total mixed ration (approximately 15 kg of DM/cow per day) and allowed to graze an oat pasture (Avena sativa). Dry matter intake was 19.1 kg of DM/cow per day on average and was not affected by treatments. Milk yield was 40% lower in cows milked 1× during the treatment period, and a carryover effect existed until wk 21 of lactation, resulting in a final reduction of 15% of milk yield in the whole lactation. Milk lactose concentration decreased, whereas fat and protein concentrations increased for cows milked 1×. Mobilization of energy reserves during the treatment period occurred in both groups, but cows milked 1× showed greater body condition score and greater backfat thickness. In conclusion, milking 1× during the first 8 wk of lactation resulted in immediate and carryover negative effects on milk and milk solid yield without affecting feed intake, resulting in the improved energy status of primiparous dairy cows.
650 $aLECHERÍA
650 $aVACAS LECHERAS
653 $aDAIRY COWS
653 $aGRAZING
653 $aONCE-DAILY MILKING
653 $aORDEÑE UNA VEZ AL DIA
653 $aVACA HOLSTEIN
700 1 $aKOZLOSKI, G.
700 1 $aMENDOZA, A.
700 1 $aPLA, M.
700 1 $aREPETTO, J.
700 1 $aCAJARVILLE, C.
773 $tJournal of Dairy Science, October 2019, Volume 102, Issue 10, Pages 8919-8930.
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INIA La Estanzuela (LE) |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas; INIA Treinta y Tres. |
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Fecha actual : |
22/07/2018 |
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Actualizado : |
28/11/2018 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Circulación / Nivel : |
Internacional - -- |
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Autor : |
WEINROTH, M.D.; SCOTT, H.M.; NORBY, B.; LONERAGAN, G.H.; NOYES, N.R.; ROVIRA, P.J.; DOSTER, E.; YANG, X.; WOERNER, D.R.; MORLEY, P.S.; BELK, K.E. |
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Afiliación : |
M.D. WEINROTH, Universidad de Colorado State (CSU)/ Department of Animal Science (Meat Program); H.M. SCOTT, Universidad de Texas A&M; B. NORBY, Universidad de Michigan State (MSU); G.H. LONERAGAN, Texas Tech University; N.R. NOYES, Universidad de Colorado State (CSU); PABLO JUAN ROVIRA SANZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; E. DOSTER, Universidad de Colorado State (CSU); X. YANG, Universidad de California Davis (UCD); D.R. WOERNER, Universidad de Colorado State (CSU)/ Department of Animal Science (Meat Program); P. S. MORLEY, Universidad de Colorado State (CSU); K. E. BELK, Universidad de Colorado State (CSU)/ Department of Animal Science (Meat Program). |
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Título : |
Effects of ceftiofur and chlortetracycline on the resistomes of feedlot cattle. |
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Fecha de publicación : |
2018 |
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Fuente / Imprenta : |
Applied and Environmental Microbiology, July 2018, vol. 84, no.13, e00610-18. |
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Descripción física : |
This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license. |
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ISSN : |
0099-2240 |
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DOI : |
10.1128/AEM.00610-18 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 15 March 2018. / Accepted 24 April 2018. / Accepted manuscript posted online 4 May 2018. OPEN ACCESS. |
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Contenido : |
ABSTRACT.
Treatment of food-producing animals with antimicrobial drugs (AMD) is controversial because of concerns regarding promotion of antimicrobial resistance (AMR). To investigate this concern, resistance genes in metagenomic bovine fecal samples during a clinical trial were analyzed to assess the impacts of treatment on beef feedlot cattle resistomes. Four groups of cattle were exposed, using a 2-by-2 factorial design, to different regimens of antimicrobial treatment. Injections of ceftiofur crystalline- free acid (a third-generation cephalosporin) were used to treat all cattle in treatment pens or only a single animal, and either chlortetracycline was included in the feed of all cattle in a pen or the feed was untreated. On days 0 and 26, respectively, pre- and posttrial fecal samples were collected, and resistance genes were characterized using shotgun metagenomics. Treatment with ceftiofur was not associated with changes to ?-lactam resistance genes. However, cattle fed chlortetracycline had a significant increase in relative abundance of tetracycline resistance genes. There was also an increase of an AMR class not administered during the study, which is a possible indicator of coselection of resistance genes. Samples analyzed in this study had previously been evaluated by culture characterization (Escherichia coli and Salmonella) and quantitative PCR (qPCR) of metagenomic fecal DNA, which allowed comparison of results with this study. In the majority of samples, genes that were selectively enriched through culture and qPCR were not identified through shotgun metagenomic sequencing in this study, suggesting that changes previously documented did not reflect changes affecting the majority of bacterial genetic elements found in the predominant fecal resistome.
© 2018 American Society for Microbiology. MenosABSTRACT.
Treatment of food-producing animals with antimicrobial drugs (AMD) is controversial because of concerns regarding promotion of antimicrobial resistance (AMR). To investigate this concern, resistance genes in metagenomic bovine fecal samples during a clinical trial were analyzed to assess the impacts of treatment on beef feedlot cattle resistomes. Four groups of cattle were exposed, using a 2-by-2 factorial design, to different regimens of antimicrobial treatment. Injections of ceftiofur crystalline- free acid (a third-generation cephalosporin) were used to treat all cattle in treatment pens or only a single animal, and either chlortetracycline was included in the feed of all cattle in a pen or the feed was untreated. On days 0 and 26, respectively, pre- and posttrial fecal samples were collected, and resistance genes were characterized using shotgun metagenomics. Treatment with ceftiofur was not associated with changes to ?-lactam resistance genes. However, cattle fed chlortetracycline had a significant increase in relative abundance of tetracycline resistance genes. There was also an increase of an AMR class not administered during the study, which is a possible indicator of coselection of resistance genes. Samples analyzed in this study had previously been evaluated by culture characterization (Escherichia coli and Salmonella) and quantitative PCR (qPCR) of metagenomic fecal DNA, which allowed comparison of results with this study. In the majority of samples, gen... Presentar Todo |
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Palabras claves : |
ANTIBIOTIC RESISTANCE; ANTIMICROBIAL AGENTS; CATTLE; METAGENOMICS; POSTANTIBIOTIC EFFECT. |
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Thesagro : |
FEEDLOT. |
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Asunto categoría : |
--
L02 Alimentación animal |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/12027/1/e00610-18.full.pdf
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Marc : |
LEADER 03064naa a2200361 a 4500
001 1058828
005 2018-11-28
008 2018 bl uuuu u00u1 u #d
022 $a0099-2240
024 7 $a10.1128/AEM.00610-18$2DOI
100 1 $aWEINROTH, M.D.
245 $aEffects of ceftiofur and chlortetracycline on the resistomes of feedlot cattle.$h[electronic resource]
260 $c2018
300 $cThis is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.
500 $aArticle history: Received 15 March 2018. / Accepted 24 April 2018. / Accepted manuscript posted online 4 May 2018. OPEN ACCESS.
520 $aABSTRACT. Treatment of food-producing animals with antimicrobial drugs (AMD) is controversial because of concerns regarding promotion of antimicrobial resistance (AMR). To investigate this concern, resistance genes in metagenomic bovine fecal samples during a clinical trial were analyzed to assess the impacts of treatment on beef feedlot cattle resistomes. Four groups of cattle were exposed, using a 2-by-2 factorial design, to different regimens of antimicrobial treatment. Injections of ceftiofur crystalline- free acid (a third-generation cephalosporin) were used to treat all cattle in treatment pens or only a single animal, and either chlortetracycline was included in the feed of all cattle in a pen or the feed was untreated. On days 0 and 26, respectively, pre- and posttrial fecal samples were collected, and resistance genes were characterized using shotgun metagenomics. Treatment with ceftiofur was not associated with changes to ?-lactam resistance genes. However, cattle fed chlortetracycline had a significant increase in relative abundance of tetracycline resistance genes. There was also an increase of an AMR class not administered during the study, which is a possible indicator of coselection of resistance genes. Samples analyzed in this study had previously been evaluated by culture characterization (Escherichia coli and Salmonella) and quantitative PCR (qPCR) of metagenomic fecal DNA, which allowed comparison of results with this study. In the majority of samples, genes that were selectively enriched through culture and qPCR were not identified through shotgun metagenomic sequencing in this study, suggesting that changes previously documented did not reflect changes affecting the majority of bacterial genetic elements found in the predominant fecal resistome. © 2018 American Society for Microbiology.
650 $aFEEDLOT
653 $aANTIBIOTIC RESISTANCE
653 $aANTIMICROBIAL AGENTS
653 $aCATTLE
653 $aMETAGENOMICS
653 $aPOSTANTIBIOTIC EFFECT
700 1 $aSCOTT, H.M.
700 1 $aNORBY, B.
700 1 $aLONERAGAN, G.H.
700 1 $aNOYES, N.R.
700 1 $aROVIRA, P.J.
700 1 $aDOSTER, E.
700 1 $aYANG, X.
700 1 $aWOERNER, D.R.
700 1 $aMORLEY, P.S.
700 1 $aBELK, K.E.
773 $tApplied and Environmental Microbiology, July 2018, vol. 84, no.13, e00610-18.
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