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Previous issue date: 2013 / Foram conduzidos dois experimentos para avaliar o efeito de dietas, contendo dois n?veis de prote?na bruta e de concentrado sobre o consumo e a digestibilidade aparente total dos nutrientes, o balan?o de nitrog?nio (BN), o pH, a concentra??o de nitrog?nio amoniacal (N-NH3) no r?men, a efici?ncia microbiana e o desempenho em cordeiros. As dietas consistiram de 10,0 e 14,25% de prote?na bruta (PB) e de 40 e 60% de concentrado (CONC), utilizando-se a silagem de milho como volumoso. No ensaio de digestibilidade, foram utilizados quatro cordeiros machos, n?o castrados, F1 Santa In?s x Texel desmamados, com peso vivo m?dio de 21 kg, fistulados no r?men e distribu?dos em quadrado latino 4 x 4, com quatro animais, quatro dietas e quatro per?odos. Cada per?odo experimental teve dura??o de 15 dias, sendo nove dias para adapta??o e seis para coletas. Houve efeito da intera??o tripla (PBxCONCxTempo) sobre os teores de nitrog?nio amoniacal ruminal, enquanto o pH n?o foi afetado. N?o houve efeito da intera??o PB x CONC sobre as vari?veis estudadas. Houve efeito de n?veis de PB sobre o consumo e a digestibildade de PB, bem como, sobre as quantidades de N ingerido, absorvido, urin?rio e retido (BN) e sobre as excre??es de ?cido ?rico. No ensaio de desempenho, foram utilizados 30 cordeiros F1 Santa In?s x Texel, n?o castrados, com peso vivo m?dio de 19 kg, distribu?dos em esquema fatorial 2x2, no delineamento em blocos casualizados, com quatro dietas e oito repeti??es. Al?m desses, mais quatro cordeiros foram abatidos no in?cio da fase experimental, representando os animais refer?ncia. Houve efeito da intera??o de n?veis de PB e de concentrado para os consumos de EE, FDNcp e CNF. Houve efeito de n?veis de PB sobre os consumos de MS, MO, PB, FDNcp, NDT, PDR e PNDR, o GMD, GCPCJ e a CA. Houve efeito dos n?veis de concentrado sobre os consumos de MS, MO, PB, CNF e NDT e sobre GMD, GCPCJ, GCPCJ/GMD e CA. Conclui-se que, dietas com n?vel mais alto de PB ou de concentrado, proporcionam mais alto consumo de nutrientes e melhor desempenho animal. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013. / ABSTRACT
Two essays were performed in order to evaluate the effects of diets containing two levels of crude protein and concentrate on the consumption, the total apparent digestibility of the nutrients, the nitrogen balance, the pH, the N-NH3 concentration in the rumen, the microbial efficiency and the performance in lambs. The diets consisted of 10,0 and 14,25% crude protein (CP) and 40 and 60% concentrate, using corn silage as forage. In the digestibility essay, four male lambs were used. The animals were not castrated, F1 Santa In?s x Texel, weaned, rumen fistulated, presented an average live weight of 21 kg and were distributed in Latin square 4 x 4, with four diets and four periods. Each experimental period lasted 15 days, being nine of it for adaptation and six for the collections. Triple interaction (CP x CONC x Time) acted on the ruminal ammonia nitrogen contents, while the pH was not affected. The interaction between CP x CONC had no effect on the studied variables. The CP levels presented an effect on the consumption and the PB digestibility, as for the amounts of ingested, absorbed and urinary nitrogen and for the uric acid excretions. In the performance essays, 30 ?F1 Santa In?s x Texel? castrated lambs were used, presenting an average live weight of 19 kg and distributed in the randomized block design using four treatments and eight replicates. Beside these lambs, other four were slaughtered in the beginning of the experimental phase, representing the reference animals. The PB and the concentrate levels interaction affected the EE, NDFap and NFC consumption. The CP levels also affected the DM, OM, CP, NDFap, TDN, RDP and RUP, ADG, CGBWF and FC consumption. The concentrate levels affected DM, OM, CP, NFCap and TDN and also ADG, CGBWF, GCBWF/ADG and FC replicates. So, we conclude the crude protein and concentrate levels do not affect the nutrients consumption and digestibility, except for the crude protein which is higher in a diet with high protein levels, that also provide higher nitrogen balance values, N-NH3 concentrations and uric acid excretions. The diets containing 14,25% PB or 60% concentrate promote higher nutrients consumptions and better lambs performances.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/330 |
| Date | 18 July 2013 |
| Creators | Santos, Regina Silva |
| Contributors | Ribeiro, Karina Guimar?es, Valadares Filho, Sebasti?o de Campos, Pereira, Odilon Gomes, Villela, Severino Delmar Junqueira, Valadares Filho, Sebasti?o de Campos, Pereira, Odilon Gomes, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Ribeiro, Karina Guimar?es |
| Publisher | UFVJM |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM |
| Rights | A concess?o da licen?a deste item refere-se ao ? termo de autoriza??o impresso assinado pelo autor, assim como na licen?a Creative Commons, com as seguintes condi??es: Na qualidade de titular dos direitos de autor da publica??o, autorizo a Universidade Federal dos Vales do Jequitinhonha e Mucuri e o IBICT a disponibilizar por meio de seus reposit?rios, sem ressarcimento dos direitos autorais, de acordo com a Lei n? 9610/98, o texto integral da obra disponibilizada, conforme permiss?es assinaladas, para fins de leitura, impress?o e/ou download, a t?tulo de divulga??o da produ??o cient?fica brasileira, e preserva??o, a partir desta data., info:eu-repo/semantics/openAccess |
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