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Biblioteca (s) : |
INIA Tacuarembó. |
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Fecha : |
08/09/2014 |
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Actualizado : |
30/09/2019 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
MEDEROS, A.; WADDELL, L.; SÁNCHEZ, J.; KELTON, D.; PEREGRINE, A.S.; MENZIES, P.; VANLEEUWEN, J.; RAJIC, A. |
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Afiliación : |
AMERICA ESTHER MEDEROS SILVEIRA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
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Título : |
A systematic review meta analysis of primary research investigating the effect of selected alternative treatments on gastrointestinal nematodes in sheep under field conditions. |
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Fecha de publicación : |
2012 |
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Fuente / Imprenta : |
Preventive Veterinary Medicine, 2012, v. 104, p. 1-14 |
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Volumen : |
104 |
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Páginas : |
1-14 |
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DOI : |
10.1016/j.prevetmed.2011.10.012 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 18 August 2011 //Received in revised form 27 October 2011 // Accepted 30 October 2011. |
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Contenido : |
Selected alternative treatments for preventing or controlling gastrointestinal nematodes (GIN) in sheep under field conditions were evaluated using a systematic review-meta-analysis methodology. Forty-three publications reporting 51 studies (21 controlled studies (CS) and 30 challenge studies (ChS)) and 85 unique treatment comparisons were included in the review. The alternative treatment categories were nutraceuticals (28 studies), breeding for genetic resistance (12), nutritional manipulation (6), homeopathies (2), administration of copper oxide wire particles (2), and biological control (1). Random effect meta-analyses (MA) and meta-regression were performed with the natural logarithm of the difference in means (lnMD) between the control and treatment groups, for fecal egg counts per gram of wet feces (FEC), worm counts (WC) or fecal egg counts per gram of dry matter (FECDM) as the outcome. Treatment effect estimates (lnMD) were back-transformed to their count ratios (CR), a relative measure of effect for controlled versus treated groups, for presentation of results. Significant heterogeneity was observed for both CS and ChS that evaluated nutraceuticals, genetic resistance and nutrition treatments. MA of ChS that investigated nutraceuticals resulted in a significant overall CR of 1.62 (P<0.01) and 1.64 (P<0.01) for FEC and FECDM, respectively and a marginal significant CR of 1.14 (P=0.06) for WC, all favoring the treated groups. MA of CS and ChS that investigated genetic resistance resulted in a significant overall CR of 5.89 and 15.42, respectively (P<0.01), again favoring treated groups. MA of CS that investigated homeopathies with FEC as an outcome were homogenous (I(2)=0.0%) and resulted in a non-significant pooled CR of 1.61. ChS investigating copper oxide wire particle treatments and WC as an outcome, were homogenous (I(2)=0.0%) and had a marginally significant pooled CR of 1.68 (P=0.06). Publication bias was observed for ChS with WC outcomes, indicating that small size studies reporting non-significant CR, were less likely to be published than similar studies that found a significant CR. In a meta-regression, randomization (6.2%) and study size (29.2%) were the main factors contributing to the total variation when the outcome was FEC, and none of the variables contributed to between study heterogeneity. When the outcome was WC, type of treatment was the only significant covariate, explaining 6% of the heterogeneity and 38.5% of the total variation. The methodological soundness and reporting of primary research in the selected studies were low. Our results indicate that from the studied alternative treatments, nutraceuticals and use of genetically resistant sheep might be more promising for control of GINs in sheep. MenosSelected alternative treatments for preventing or controlling gastrointestinal nematodes (GIN) in sheep under field conditions were evaluated using a systematic review-meta-analysis methodology. Forty-three publications reporting 51 studies (21 controlled studies (CS) and 30 challenge studies (ChS)) and 85 unique treatment comparisons were included in the review. The alternative treatment categories were nutraceuticals (28 studies), breeding for genetic resistance (12), nutritional manipulation (6), homeopathies (2), administration of copper oxide wire particles (2), and biological control (1). Random effect meta-analyses (MA) and meta-regression were performed with the natural logarithm of the difference in means (lnMD) between the control and treatment groups, for fecal egg counts per gram of wet feces (FEC), worm counts (WC) or fecal egg counts per gram of dry matter (FECDM) as the outcome. Treatment effect estimates (lnMD) were back-transformed to their count ratios (CR), a relative measure of effect for controlled versus treated groups, for presentation of results. Significant heterogeneity was observed for both CS and ChS that evaluated nutraceuticals, genetic resistance and nutrition treatments. MA of ChS that investigated nutraceuticals resulted in a significant overall CR of 1.62 (P<0.01) and 1.64 (P<0.01) for FEC and FECDM, respectively and a marginal significant CR of 1.14 (P=0.06) for WC, all favoring the treated groups. MA of CS and ChS that investigated genetic... Presentar Todo |
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Palabras claves : |
ALTERNATIVE TREATMENTS; CONTROL METHODS; GASTROINTESTINAL NEMATODES; MEDICINA VETERINARIA; META-ANALYSIS; SHEEP; SYSTEMATIC REVIEW. |
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Thesagro : |
OVINOS. |
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Asunto categoría : |
L73 Enfermedades de los animales |
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Marc : |
LEADER 03914naa a2200349 a 4500
001 1050042
005 2019-09-30
008 2012 bl uuuu u00u1 u #d
024 7 $a10.1016/j.prevetmed.2011.10.012$2DOI
100 1 $aMEDEROS, A.
245 $aA systematic review meta analysis of primary research investigating the effect of selected alternative treatments on gastrointestinal nematodes in sheep under field conditions.
260 $c2012
300 $a1-14 104
490 $v104
500 $aArticle history: Received 18 August 2011 //Received in revised form 27 October 2011 // Accepted 30 October 2011.
520 $aSelected alternative treatments for preventing or controlling gastrointestinal nematodes (GIN) in sheep under field conditions were evaluated using a systematic review-meta-analysis methodology. Forty-three publications reporting 51 studies (21 controlled studies (CS) and 30 challenge studies (ChS)) and 85 unique treatment comparisons were included in the review. The alternative treatment categories were nutraceuticals (28 studies), breeding for genetic resistance (12), nutritional manipulation (6), homeopathies (2), administration of copper oxide wire particles (2), and biological control (1). Random effect meta-analyses (MA) and meta-regression were performed with the natural logarithm of the difference in means (lnMD) between the control and treatment groups, for fecal egg counts per gram of wet feces (FEC), worm counts (WC) or fecal egg counts per gram of dry matter (FECDM) as the outcome. Treatment effect estimates (lnMD) were back-transformed to their count ratios (CR), a relative measure of effect for controlled versus treated groups, for presentation of results. Significant heterogeneity was observed for both CS and ChS that evaluated nutraceuticals, genetic resistance and nutrition treatments. MA of ChS that investigated nutraceuticals resulted in a significant overall CR of 1.62 (P<0.01) and 1.64 (P<0.01) for FEC and FECDM, respectively and a marginal significant CR of 1.14 (P=0.06) for WC, all favoring the treated groups. MA of CS and ChS that investigated genetic resistance resulted in a significant overall CR of 5.89 and 15.42, respectively (P<0.01), again favoring treated groups. MA of CS that investigated homeopathies with FEC as an outcome were homogenous (I(2)=0.0%) and resulted in a non-significant pooled CR of 1.61. ChS investigating copper oxide wire particle treatments and WC as an outcome, were homogenous (I(2)=0.0%) and had a marginally significant pooled CR of 1.68 (P=0.06). Publication bias was observed for ChS with WC outcomes, indicating that small size studies reporting non-significant CR, were less likely to be published than similar studies that found a significant CR. In a meta-regression, randomization (6.2%) and study size (29.2%) were the main factors contributing to the total variation when the outcome was FEC, and none of the variables contributed to between study heterogeneity. When the outcome was WC, type of treatment was the only significant covariate, explaining 6% of the heterogeneity and 38.5% of the total variation. The methodological soundness and reporting of primary research in the selected studies were low. Our results indicate that from the studied alternative treatments, nutraceuticals and use of genetically resistant sheep might be more promising for control of GINs in sheep.
650 $aOVINOS
653 $aALTERNATIVE TREATMENTS
653 $aCONTROL METHODS
653 $aGASTROINTESTINAL NEMATODES
653 $aMEDICINA VETERINARIA
653 $aMETA-ANALYSIS
653 $aSHEEP
653 $aSYSTEMATIC REVIEW
700 1 $aWADDELL, L.
700 1 $aSÁNCHEZ, J.
700 1 $aKELTON, D.
700 1 $aPEREGRINE, A.S.
700 1 $aMENZIES, P.
700 1 $aVANLEEUWEN, J.
700 1 $aRAJIC, A.
773 $tPreventive Veterinary Medicine, 2012$gv. 104, p. 1-14
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INIA Tacuarembó (TBO) |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha actual : |
31/01/2020 |
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Actualizado : |
31/01/2020 |
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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 : |
BAETHGEN, W.E.; CHRISTIANSON, C.B.; GARCIA, A. |
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Afiliación : |
WALTER E. BAETHGEN, Research and Development Division, International Fertilizer Development Center, Muscle Shoals, AL, United States; BRUCE C. CHRISTIANSON, Research and Development Division, International Fertilizer Development Center, Muscle Shoals, AL, United States; ADRIANA GARCIA LAMOTHE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
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Título : |
Nitrogen fertilizer effects on growth, grain yield, and yield components of malting barley. |
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Fecha de publicación : |
1995 |
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Fuente / Imprenta : |
Field Crops Research, October 1995, Volume 43, Issue 2-3, Pages 87-99. |
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ISSN : |
0378-4290 |
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DOI : |
10.1016/0378-4290(95)00034-N |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 28 January 1994 / Accepted 6 June 1995. |
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Contenido : |
ABSTRACT.
Optimal strategies for using nitrogen fertilizer with malting barley (Hordeum vulgare L.) must aim to maximize yield while maintaining low N content in grain to preserve malting quality. Eleven field experiments were conducted during 1989-1991 with the objective of determining the impact of N fertilizer applied at different growth stages on crop growth, grain yield, and yield components of malting barley. Treatments included single applications of N fertilizer at sowing, at Zadoks growth stages Z-22 (midtillering) or Z-30 (end of tillering) and differing levels of N applied at each of these times. High rates of N applied early in the growing season stimulated tillering but many of these tillers did not produce spikes. An effect of N on spike number was evident only in comparisons of fertilized and unfertilized treatments through a positive correlation between number of spikes at maturity and the number of tillers at Z-30. Nitrogen fertilizer applied at Z-30 resulted in 30% to 100% increases in number of kernels/spike over unfertilized plots though number of kernels/spike was negatively correlated with number of spikes/m2, indicating compensation effects. Nitrogen applications at Z-30 were also most effective for increasing number of kernels/m2 while kernel weight responded only slightly to N. Mean kernel weight for all site-years revealed that none of the three years presented limiting conditions for grain filling. Cumulative probability curves for yields and yield components indicated that N fertilizer applied at Z-30 gave the best results in most situations but only when sufficient N was available at sowing to ensure crop establishment and initial tiller development. In contrast, the Z-30 treatment had the least impact on yield and yield components when no fertilizer was applied at sowing. Number of kernels/spike and number of kernels/m2 were the only two yield components with a clear association with grain yields. The research indicates that N fertilizer strategies for malting barley should ensure relatively small amounts of available N at sowing for crop establishment and initial tiller development. Additional N would then be applied at the end of tillering, the amount required depending on the crop and soil management systems used. © 1995. MenosABSTRACT.
Optimal strategies for using nitrogen fertilizer with malting barley (Hordeum vulgare L.) must aim to maximize yield while maintaining low N content in grain to preserve malting quality. Eleven field experiments were conducted during 1989-1991 with the objective of determining the impact of N fertilizer applied at different growth stages on crop growth, grain yield, and yield components of malting barley. Treatments included single applications of N fertilizer at sowing, at Zadoks growth stages Z-22 (midtillering) or Z-30 (end of tillering) and differing levels of N applied at each of these times. High rates of N applied early in the growing season stimulated tillering but many of these tillers did not produce spikes. An effect of N on spike number was evident only in comparisons of fertilized and unfertilized treatments through a positive correlation between number of spikes at maturity and the number of tillers at Z-30. Nitrogen fertilizer applied at Z-30 resulted in 30% to 100% increases in number of kernels/spike over unfertilized plots though number of kernels/spike was negatively correlated with number of spikes/m2, indicating compensation effects. Nitrogen applications at Z-30 were also most effective for increasing number of kernels/m2 while kernel weight responded only slightly to N. Mean kernel weight for all site-years revealed that none of the three years presented limiting conditions for grain filling. Cumulative probability curves for yields and yield... Presentar Todo |
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Palabras claves : |
Fertilizer; Malting barley; Nitrogen; Yield components. |
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Thesagro : |
HORDEUM VULGARE. |
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Asunto categoría : |
F01 Cultivo |
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URL : |
https://www.sciencedirect.com/science/article/pii/037842909500034N/pdf
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Marc : |
LEADER 03072naa a2200241 a 4500
001 1060732
005 2020-01-31
008 1995 bl uuuu u00u1 u #d
022 $a0378-4290
024 7 $a10.1016/0378-4290(95)00034-N$2DOI
100 1 $aBAETHGEN, W.E.
245 $aNitrogen fertilizer effects on growth, grain yield, and yield components of malting barley.$h[electronic resource]
260 $c1995
500 $aArticle history: Received 28 January 1994 / Accepted 6 June 1995.
520 $aABSTRACT. Optimal strategies for using nitrogen fertilizer with malting barley (Hordeum vulgare L.) must aim to maximize yield while maintaining low N content in grain to preserve malting quality. Eleven field experiments were conducted during 1989-1991 with the objective of determining the impact of N fertilizer applied at different growth stages on crop growth, grain yield, and yield components of malting barley. Treatments included single applications of N fertilizer at sowing, at Zadoks growth stages Z-22 (midtillering) or Z-30 (end of tillering) and differing levels of N applied at each of these times. High rates of N applied early in the growing season stimulated tillering but many of these tillers did not produce spikes. An effect of N on spike number was evident only in comparisons of fertilized and unfertilized treatments through a positive correlation between number of spikes at maturity and the number of tillers at Z-30. Nitrogen fertilizer applied at Z-30 resulted in 30% to 100% increases in number of kernels/spike over unfertilized plots though number of kernels/spike was negatively correlated with number of spikes/m2, indicating compensation effects. Nitrogen applications at Z-30 were also most effective for increasing number of kernels/m2 while kernel weight responded only slightly to N. Mean kernel weight for all site-years revealed that none of the three years presented limiting conditions for grain filling. Cumulative probability curves for yields and yield components indicated that N fertilizer applied at Z-30 gave the best results in most situations but only when sufficient N was available at sowing to ensure crop establishment and initial tiller development. In contrast, the Z-30 treatment had the least impact on yield and yield components when no fertilizer was applied at sowing. Number of kernels/spike and number of kernels/m2 were the only two yield components with a clear association with grain yields. The research indicates that N fertilizer strategies for malting barley should ensure relatively small amounts of available N at sowing for crop establishment and initial tiller development. Additional N would then be applied at the end of tillering, the amount required depending on the crop and soil management systems used. © 1995.
650 $aHORDEUM VULGARE
653 $aFertilizer
653 $aMalting barley
653 $aNitrogen
653 $aYield components
700 1 $aCHRISTIANSON, C.B.
700 1 $aGARCIA, A.
773 $tField Crops Research, October 1995, Volume 43, Issue 2-3, Pages 87-99.
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