Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | https://www.teses.usp.br/teses/disponiveis/10/10135/tde-21082020-142248/ |
Resumo: | Experiement 1: Thirty-two rumen-fistulated steers Nellore steers (Bos indicus) were assigned to a randomized complete block design, according to their initial shrunk BW (220 ± 12.6 kg). Steers were fed daily and diets were composed of 99% of coastcross haylage and 1% of concentrate, used as a delivery vehicle for the additives. The experimental diets consisted of 1) CON - a forage-based diet without additives, 2) NAR - CON diet plus 13 ppm of narasin, 3) SAL - CON diet plus 20 ppm of salinomycin, or 4) FLA - CON diet plus 3 ppm of flavomycin. The experimental period lasted 140 d, divided into 5 periods of 28 d each. There was no interaction treatment × day for parameters of intake and digestibility. The inclusion of feed additives did not affect the DMI (P = 0.20), and consequently, did not affect the nutrients intake (P > 0.17). In addition, there was no difference in nutrient digestibility among diets (P > 0.40). There is an interaction between treatment x day (P < 0.01) for AcBut:Prop ratio where the NAR treatment had the lowest values from the 56 day (P < 0.01). In addition, animals receiving narasin showed greatest values to acetate (P < 0.01) and higher values to propionate (P < 0.01), butyrate (P = 0.01) and Ac:Prop (P < 0.01). The Volatile Fatty Acids Total was lowest to SAL and FLA treatments (P = 0.02). Experiment 2: one hundred and sixty- four Nellore bulls (Bos indicus) were blocked by initial shrunk BW (298.95 ± 2.5) in a 140-d feedlot trial, divided into 5 periods of 28 d each. Bulls were fed daily and diets were composed of 96% of coastcross haylage and 4% of concentrate, used as a delivery vehicle for the additives. The treatments used were the same as in the previous experiment. There was an interaction between treatment x day for BW (P < 0.01) and Dry Matter Intake (DMI; P = 0.03). Animals of treatment NAR showed greatest BW from 84th day of the experiment (P = 0.03) and had higher DMI in the second, fourth, and fifth period of study (P < 0.05). In conclusion, the inclusion of 13 ppm of NAR improves the ruminal fermentation parameters and the performance of bulls in forage-based diets. There were no evidence that SAL and FLA are effective to forage-based diets. |
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Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performanceUso prolongado de narasina, salinomicina e flavomicina para novilhos Nelores alimentados com dieta de elevado teor de volumoso: parâmetros ruminais, digestibilidade aparente de nutrientes e desempenhoAditivos alimentaresDesempenhoDigestibilidadeDigestibilityFeed additivesParâmetros ruminaisPerformanceRuminal parametersExperiement 1: Thirty-two rumen-fistulated steers Nellore steers (Bos indicus) were assigned to a randomized complete block design, according to their initial shrunk BW (220 ± 12.6 kg). Steers were fed daily and diets were composed of 99% of coastcross haylage and 1% of concentrate, used as a delivery vehicle for the additives. The experimental diets consisted of 1) CON - a forage-based diet without additives, 2) NAR - CON diet plus 13 ppm of narasin, 3) SAL - CON diet plus 20 ppm of salinomycin, or 4) FLA - CON diet plus 3 ppm of flavomycin. The experimental period lasted 140 d, divided into 5 periods of 28 d each. There was no interaction treatment × day for parameters of intake and digestibility. The inclusion of feed additives did not affect the DMI (P = 0.20), and consequently, did not affect the nutrients intake (P > 0.17). In addition, there was no difference in nutrient digestibility among diets (P > 0.40). There is an interaction between treatment x day (P < 0.01) for AcBut:Prop ratio where the NAR treatment had the lowest values from the 56 day (P < 0.01). In addition, animals receiving narasin showed greatest values to acetate (P < 0.01) and higher values to propionate (P < 0.01), butyrate (P = 0.01) and Ac:Prop (P < 0.01). The Volatile Fatty Acids Total was lowest to SAL and FLA treatments (P = 0.02). Experiment 2: one hundred and sixty- four Nellore bulls (Bos indicus) were blocked by initial shrunk BW (298.95 ± 2.5) in a 140-d feedlot trial, divided into 5 periods of 28 d each. Bulls were fed daily and diets were composed of 96% of coastcross haylage and 4% of concentrate, used as a delivery vehicle for the additives. The treatments used were the same as in the previous experiment. There was an interaction between treatment x day for BW (P < 0.01) and Dry Matter Intake (DMI; P = 0.03). Animals of treatment NAR showed greatest BW from 84th day of the experiment (P = 0.03) and had higher DMI in the second, fourth, and fifth period of study (P < 0.05). In conclusion, the inclusion of 13 ppm of NAR improves the ruminal fermentation parameters and the performance of bulls in forage-based diets. There were no evidence that SAL and FLA are effective to forage-based diets.Experimento 1: Trinta e dois novilhos Nelore (Bos indicus) providos de cânula ruminal foram distribuídos em delineamento de blocos completos casualizados de acordo com o peso corporal em jejum (220 ± 12,6 kg). Os animais foram alimentados diariamente com dietas compostas por 99% de feno pré-secado de coastcross e 1% de concentrado, utilizado como veículo para fornecimento dos aditivos. As dietas experimentais foram: 1) CON dieta a base de forragem sem inclusão de aditivos, 2) NAR inclusão de 13 ppm de narasina, 3) SAL inclusão de 20 ppm de salinomicina e 4) FLA inclusão de 3 ppm de flavomicina. O período experimental foi de 140 dias, subdivididos em 5 períodos de 28 dias cada. Não houve interação de tratamento × dia para os parâmetros de consumo e digestibilidade. A inclusão de aditivos não afetou o CMS (P=0,20) e, consequentemente não afetou a ingestão de nutrientes (P > 0,17). De mesma forma não houve diferença na digestibilidade aparente dos nutrientes entre as dietas (P > 0,40). Houve interação entre tratamento × dia (P < 0,01) para relação AcBut:Prop em que o tratamento NAR apresentou valores menores que os demais tratamentos a partir do segundo período experimental (P < 0,01). Ainda, os animais do tratamento narasina apresentaram menores valores de concentração molar de acetato (P < 0,01), e maiores concentrações molares de propionato (P < 0,01), butirato (P < 0,01) e relação Ac:Prop (P < 0,01). O total de ácidos graxos foi menor para os tratamentos SAL e FLA em relação a CON e NAR (P = 0,02). Experimento 2: cento e sessenta e quatro novilhos Nelore (Bos indicus) foram blocados a partir do peso corporal em jejum (299 ± 2,5) em confinamento experimental com duração de 140 dias, subdividido em 5 períodos de 28 dias cada. Os animais foram alimentados diariamente com dietas contendo 96% de feno pré-secado de coastcross e 4% de concentrado, utilizados como veículo de fornecimento dos aditivos. Os tratamentos utilizados foram os mesmos do experimento anterior. Houve interação tratamento × dia para PC (P < 0,01) e CMS (P = 0,03). Foi observado maior PC para os animais do tratamento NAR a partir do terceiro período experimental (P = 0,03) e apresentaram maior CMS no segundo, quarto e quinto período experimental (P < 0,05). Em conclusão, a inclusão de 13 ppm de narasina melhora os parâmetros de fermentação ruminal e o desempenho de novilhos em dietas à base de forragem. Não houveram evidências de que o uso de salinomicina e flavomicina sejam eficazes para dietas à base de forragem.Biblioteca Digitais de Teses e Dissertações da USPPires, Alexandre VazLimede, Arnaldo Cintra2020-07-31info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttps://www.teses.usp.br/teses/disponiveis/10/10135/tde-21082020-142248/reponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USPLiberar o conteúdo para acesso público.info:eu-repo/semantics/openAccesseng2020-08-26T20:26:02Zoai:teses.usp.br:tde-21082020-142248Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212020-08-26T20:26:02Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance Uso prolongado de narasina, salinomicina e flavomicina para novilhos Nelores alimentados com dieta de elevado teor de volumoso: parâmetros ruminais, digestibilidade aparente de nutrientes e desempenho |
title |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance |
spellingShingle |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance Limede, Arnaldo Cintra Aditivos alimentares Desempenho Digestibilidade Digestibility Feed additives Parâmetros ruminais Performance Ruminal parameters |
title_short |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance |
title_full |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance |
title_fullStr |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance |
title_full_unstemmed |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance |
title_sort |
Long-term use of narasin, salinomycin and flavomycin for Nellore steers fed with high-forage diets: ruminal parameters, apparent nutrient digestibility, and performance |
author |
Limede, Arnaldo Cintra |
author_facet |
Limede, Arnaldo Cintra |
author_role |
author |
dc.contributor.none.fl_str_mv |
Pires, Alexandre Vaz |
dc.contributor.author.fl_str_mv |
Limede, Arnaldo Cintra |
dc.subject.por.fl_str_mv |
Aditivos alimentares Desempenho Digestibilidade Digestibility Feed additives Parâmetros ruminais Performance Ruminal parameters |
topic |
Aditivos alimentares Desempenho Digestibilidade Digestibility Feed additives Parâmetros ruminais Performance Ruminal parameters |
description |
Experiement 1: Thirty-two rumen-fistulated steers Nellore steers (Bos indicus) were assigned to a randomized complete block design, according to their initial shrunk BW (220 ± 12.6 kg). Steers were fed daily and diets were composed of 99% of coastcross haylage and 1% of concentrate, used as a delivery vehicle for the additives. The experimental diets consisted of 1) CON - a forage-based diet without additives, 2) NAR - CON diet plus 13 ppm of narasin, 3) SAL - CON diet plus 20 ppm of salinomycin, or 4) FLA - CON diet plus 3 ppm of flavomycin. The experimental period lasted 140 d, divided into 5 periods of 28 d each. There was no interaction treatment × day for parameters of intake and digestibility. The inclusion of feed additives did not affect the DMI (P = 0.20), and consequently, did not affect the nutrients intake (P > 0.17). In addition, there was no difference in nutrient digestibility among diets (P > 0.40). There is an interaction between treatment x day (P < 0.01) for AcBut:Prop ratio where the NAR treatment had the lowest values from the 56 day (P < 0.01). In addition, animals receiving narasin showed greatest values to acetate (P < 0.01) and higher values to propionate (P < 0.01), butyrate (P = 0.01) and Ac:Prop (P < 0.01). The Volatile Fatty Acids Total was lowest to SAL and FLA treatments (P = 0.02). Experiment 2: one hundred and sixty- four Nellore bulls (Bos indicus) were blocked by initial shrunk BW (298.95 ± 2.5) in a 140-d feedlot trial, divided into 5 periods of 28 d each. Bulls were fed daily and diets were composed of 96% of coastcross haylage and 4% of concentrate, used as a delivery vehicle for the additives. The treatments used were the same as in the previous experiment. There was an interaction between treatment x day for BW (P < 0.01) and Dry Matter Intake (DMI; P = 0.03). Animals of treatment NAR showed greatest BW from 84th day of the experiment (P = 0.03) and had higher DMI in the second, fourth, and fifth period of study (P < 0.05). In conclusion, the inclusion of 13 ppm of NAR improves the ruminal fermentation parameters and the performance of bulls in forage-based diets. There were no evidence that SAL and FLA are effective to forage-based diets. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-07-31 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://www.teses.usp.br/teses/disponiveis/10/10135/tde-21082020-142248/ |
url |
https://www.teses.usp.br/teses/disponiveis/10/10135/tde-21082020-142248/ |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
|
dc.rights.driver.fl_str_mv |
Liberar o conteúdo para acesso público. info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Liberar o conteúdo para acesso público. |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.coverage.none.fl_str_mv |
|
dc.publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
publisher.none.fl_str_mv |
Biblioteca Digitais de Teses e Dissertações da USP |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
_version_ |
1815257247666667520 |