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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

N?veis de prote?na bruta e de concentrado em dietas para cordeiros / Levels of crude protein and concentrate in diets for lambs

Santos, Regina Silva 18 July 2013 (has links)
Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-01-05T15:55:10Z No. of bitstreams: 2 regina_silva_santos.pdf: 994226 bytes, checksum: 2d65c8a318f4c25b5c82de13adb8fbad (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-01-05T15:56:19Z (GMT) No. of bitstreams: 2 regina_silva_santos.pdf: 994226 bytes, checksum: 2d65c8a318f4c25b5c82de13adb8fbad (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-01-05T15:56:37Z (GMT) No. of bitstreams: 2 regina_silva_santos.pdf: 994226 bytes, checksum: 2d65c8a318f4c25b5c82de13adb8fbad (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2015-01-05T15:56:37Z (GMT). No. of bitstreams: 2 regina_silva_santos.pdf: 994226 bytes, checksum: 2d65c8a318f4c25b5c82de13adb8fbad (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) 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.
2

Desempenho, caracter?sticas de carca?a e qualidade de carne em diferentes classes sexuais de bovinos / Performance, carcass traits and beef quality in differents cattle gender

Lage, Igor Nero Kelles 30 April 2010 (has links)
Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-18T13:31:11Z No. of bitstreams: 2 igor_nero_kelles_lage.pdf: 553484 bytes, checksum: f586c23a68b5565ba2fdb50202e3ac93 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-11-18T13:31:37Z (GMT) No. of bitstreams: 2 igor_nero_kelles_lage.pdf: 553484 bytes, checksum: f586c23a68b5565ba2fdb50202e3ac93 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2015-11-18T13:31:37Z (GMT). No. of bitstreams: 2 igor_nero_kelles_lage.pdf: 553484 bytes, checksum: f586c23a68b5565ba2fdb50202e3ac93 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2010 / Objetivou-se com este trabalho avaliar quanto ? classe sexual de bovinos influencia as caracter?sticas de desempenho, consumo, efici?ncia alimentar, al?m das caracter?sticas de carca?a e qualidade de carne. O experimento foi realizado em delineamento inteiramente casualizado, utilizando-se 15 bovinos, sendo 5 machos castrados, 5 f?meas castradas e 5 f?meas. Os animais foram distribu?dos aleatoriamente em baias individuais, onde receberam a mesma dieta por um per?odo de 106 dias. Ao final do experimento, foram abatidos e coletados os dados referentes ?s caracter?sticas de carca?a: pH, temperatura, peso das carca?as quentes e frias, ?rg?os e v?sceras. Da meia carca?a direita foram pesados os cortes: ac?m, paleta, ponta de agulha, cox?o e alcatra completa. Na meia carca?a esquerda, foram mensuradas a ?rea de olho de lombo, a espessura de gordura subcut?nea e o comprimento da carca?a. A sec??o HH foi retirada de cada animal, entre a 9? e a 11? costela; e dela foram separados e pesados os m?sculos, gordura e ossos. Foi coletada uma amostra do m?sculo Longissimus dorsi, correspondente a cada animal para an?lises de composi??o qu?mica, ?ndice de fragmenta??o miofibrilar, for?a de cisalhamento, porcentagem de col?geno sol?vel e teor de col?geno total, colora??o e c?lculo das perdas. Entre as classes sexuais n?o houve diferen?a estat?stica para ganho de peso, consumo e digestibilidade da mat?ria seca e dos nutrientes, efici?ncia alimentar e caracter?sticas de carca?a. Avaliando-se o m?sculo Longissimus dorsi dos bovinos pertencentes ?s diferentes classes sexuais, verificou-se tamb?m que n?o houve diferen?a estat?stica para as vari?veis: maciez, cor, pH, percentual de col?geno sol?vel e quantidade total de col?geno, perdas e composi??o qu?mica. De acordo com as caracter?sticas de carca?a, desempenho, consumo, efici?ncia alimentar e das caracter?sticas qualitativas da carne avaliadas, verifica-se que n?o h? necessidade de castra??o de f?meas e machos bovinos com o intuito de aumentar o desempenho, melhorar as caracter?sticas de carca?a e qualidade de carne. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2010. / ABSTRACT The goal of this work was to evaluate how cattle gender profile influences performance, intake, feed efficiency, as long as carcass and traits beef quality. The experiment was carried out in a complete randomized design, using 15 animals (5 steers, 5 spayed heifers and 5 intact heifers.) They animals were distributed randomly in individual pens. All animals receive the same diet for a period of 106 days. At the end of the experiment, they were slaughtered and data related to the carcass were collected: pH, temperature, of hot and cold carcass weight, organs and visceral weight. The right half carcass was processed into chuck, shoulder, flank boneless, round, and d-rump. From de left half carcass was taken of measure of the rib eye area, fat thickness and carcass length. From the 9th to 11th left half carcass, the rib was cut off (HH section) and then dissected into muscle, fat and bones. A sample of the Longissimus dorsi muscle from each carcass was collected and analyze for it?s chemical composition, myofibrillar fragmentation index, shear force, percentage of total and soluble collagen, color, and losses. Among the sexual classes there wasn?t any difference on performance, intake and digestibility of dry matter and nutrients, feed efficiency or carcass characteristics. Evaluating the Longissimus dorsi muscles of the cattle from different sexual classes it was verified that there wasn?t any difference for the variables: MFI, Shear force, color, pH, percentage of total and soluble collagen, loss and chemical composition. From the data of carcass traits, performance, intake, feed efficiency and meat quality evaluated it can be concluded that there isn?t necessary to castrate heifers and steers in order to increase performance and improve carcass traits and meat quality.

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