Desempenho, digestibilidade e características de carcaça de novilhos zebuínos alimentados com dietas contendo diferentes níveis de concentrado

Costa, Marcos Antônio Lana; Filho, Sebastião de Campos Valadares; Paulino, Mário Fonseca; Valadares, Rilene Ferreira Diniz; Cecon, Paulo Roberto; Paulino, Pedro Veiga Rodrigues; Moraes, Eduardo Henrique Bevitori Kling de; Magalhães, Karla Alves

doi:10.1590/s1516-35982005000100031

Cited by 30 publications

(32 citation statements)

References 11 publications

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“…Previous studies (COSTA et al, 2005;SILVA et al, 2004;YOKOO et al, 2009) indicate that even when considering research using animals of the same breed, the values of growth and carcass traits differ considerably from one study to another. This is probably due to variations in types of management and feed regimes, as well as the ages at which the measures were obtained.…”

Section: Resultsmentioning

confidence: 99%

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

Castro¹,

Magnabosco²,

Sainz³

et al. 2014

Rev. Ciênc. Agron.

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-The aim of the present study was to analyze the interrelationships among the variables and also estimate the genetic correlations between tenderness (WBSF), growth (ILW, FLW and ADG) and carcass (BF, RF and LMA) features. Other purpose was to identify individuals who were more likely to be carriers of favorable genes for tenderness. Growth, carcass and tenderness data from 415 Polled Nellore animals was analyzed. Factor analysis and canonical correlations were used to analyze the phenotypic relationships. The covariance components and genetic parameters were estimated using Gibbs Sampling method. Lack of phenotypical correlations between the WBSF and the other traits were observed. The genetic correlations between WBSF and the other evaluated traits were of a low magnitude, with values of -0.15; -0.18; -0.13; 0.10; -0.12 and 0.18, between WBSF and ILW, FLW, ADG, BF, RF and LMA, respectively. The results support the conclusion that tenderness selection will not affect the selection of other economic traits and vice-versa, but for a better knowledge of the genetic relationships between meat tenderness and other traits for Polled Nellore more studies are required. The heritability estimated for WBSF was of a low magnitude (0.11 ± 0.022). Based on the principle of probability of identical genes by ancestry individuals who were more likely to be carriers of favorable genes for tenderness were identified. Further work will include creation of a segregating population that will serve as experimental material for future gene prospecting and identification research.Key works: Carcass. Shear force. Pedigree.RESUMO -Objetivou-se analisar os inter-relacionamentos entre as variáveis, além de estimar as correlações genéticas entre os grupos de características de maciez (FC), crescimento (PI, PF e GPD) e carcaça (EG, P8 e AOL). Foi proposto também, identificar indivíduos que apresentem alta probabilidade de serem portadores de genes favoráveis à maciez. Analisouse dados de 415 animais Nelore Mocho, filhos de touros representativos das principais linhagens Nelore, avaliados para características de crescimento, carcaça e maciez. Para análises de relacionamentos fenotípicos foram utilizadas análises de fatores e correlações canônicas. Os componentes de variância necessários à obtenção dos parâmetros genéticos foram estimados pelo método da Amostragem de Gibbs. Observou-se ausência de correlações fenotípicas entre FC e as outras características produtivas. As correlações genéticas entre FC e PI, PF, GPD, EG, P8 e AOL foram de baixa magnitude (-0,15; -0,18; -0,13; 0,10; -0,12 e 0,18). A seleção para a maciez não influenciará na seleção de outras características de interesse econômico e vice-versa, porém serão necessários mais estudos para melhor conhecimento sobre as relações genéticas da maciez e outras características produtivas em bovinos Nelore Mocho. A estimativa de herdabilidade para a característica FC foi de baixa magnitude (0,11 ± 0,022). Baseando-se no princípio da probabilidade de genes idênticos por descendê...

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Section: Resultsmentioning

confidence: 99%

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

Castro¹,

Magnabosco²,

Sainz³

et al. 2014

Rev. Ciênc. Agron.

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“…Domingues et al (2006) O incremento do nível de concentrado resultou em aumento linear dos consumos de nutrientes (P<0,05), exceto FDN, tanto em kg/dia quanto em % do PC, o que está relacionado à menor porcentagem de FDN nas dietas com maior nível de concentrado. Costa et al (2005), em pesquisa com cana-de-açúcar com diferentes relações volumoso:concentrado, constataram acréscimo na ingestão dos nutrientes à medida que se aumentaram o nível de concentrado da dieta. Do mesmo modo, Silva et al (2005) avaliaram bovinos de corte alimentados com diferentes proporções de concentrado e verificaram que apenas o consumo de FDN não foi alterado pelo aumento do nível de concentrado na dieta.…”

Section: Resultsunclassified

“…Observou-se efeito (P<0,05) do nível de concentrado sobre a digestibilidade dos carboidratos totais. Costa et al (2005), no entanto, não observaram influência dos níveis de concentrado em dietas com cana-de-açúcar como volumoso.…”

Section: Resultsunclassified

Parâmetros nutricionais de novilhas de corte alimentadas com cana-de-açúcar tratada com óxido de cálcio e diferentes níveis de concentrado

Moraes¹,

Filho²,

Moraes³

et al. 2008

R. Bras. Zootec.

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RESUMO -Avaliaram-se o consumo, as digestibilidades total e ruminal, a eficiência de síntese microbiana, o balanço de nitrogênio (BN) e os parâmetros ruminais de novilhas de corte em confinamento alimentadas com dietas à base de canade-açúcar tratada ou não com óxido de cálcio (CaO -1%) e diferentes níveis concentrado (NC), em confinamento.Utilizaram-se seis animais (170 kg PC) distribuídos em quadrado latino 6 × 6 incompleto, em esquema fatorial 2 × 3 (canade-açúcar in natura tratada ou não com 1,0% CaO e três NC -0,0; 0,5 e 1,0% PC). Não houve interação volumoso × CL para o consumo e a digestibilidade total dos nutrientes. Com exceção dos consumos de MS e FDN (em % PC) e das Nutritional parameters of beef heifers fed sugarcane treated with calcium oxide and different concentrate levelsABSTRACT -This research was carried out to evaluate the intake, total and ruminal digestibilities, microbial efficiency synthesis, nitrogen balance (NB) and ruminal parameters of beef heifers, fed sugarcane treated or not with calcium oxide (CaO -1.0%) and different concentrate levels (CL), in feedlot. Six animals (170.0 kg BW) were allotted to a 6 × 6 Latin square design in a 2 × 3 factorial arrangement (sugarcane in nature treated or not with 1.0% CaO and three CL 0.0, 0.5 and 1.0% BW). No interaction was observed between forage and CL for nutrients intake and total digestibilities. With exception for DM and NDF intakes (% BW) and of EE and NDF total digestibilities, sugarcane treated with CaO prejudice the intake and digestibility of others nutrients. NDF intake was unaffected by CL, however the intake of the other nutrients showed a positive linearly behavior as CL increased. The total apparent digestibilities of nutrients linearly as CL increased. Ruminal digestibilities were unaffected by sugarcane treated with CaO. The increase of CL showed a positive linear behavior for DM, OM, CP, NDF ruminal digestibilities. There was no effect of sugarcane treated or not CaO on microbial nitrogen and microbial DM, which increased as CL increased in the diet. The lesser nitrogen retention was observed in animals fed sugarcane treated with CaO.Sugarcane treated with 1.0% CaO, fed after 24 hours of storage, prejudice the intake of most nutrients. Nitrogen balance and CL up to 1.0% BW improve DM intake, digestibility of most nutrients and nutrient balance.

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“…ram o custo da arroba produzida em função dos níveis de concentrado. Aumentos lineares no ganho de peso de animais confinados com o incremento do nível de concentrado na dieta são freqüentemente encontrados na literatura (Resende et al, 2001a;Costa et al, 2002). Numericamente, foi observado maior ganho de peso nos animais que receberam dietas com 50% de concentrado.…”

Section: Resultsunclassified

Consumo, digestibilidade dos nutrientes e desempenho de bovinos de corte recebendo silagem de sorgo (Sorghum bicolor (L.) Moench) e diferentes proporções de concentrado

Pereira¹,

Pereira²,

Filho³

et al. 2006

R. Bras. Zootec.

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RESUMO -Vinte e quatro bovinos machos, castrados, Holandês x Zebu (peso vivo inicial de 435 kg e 36 meses de idade) foram distribuídos em um delineamento em blocos casualizados, com seis repetições para se avaliarem o consumo e a digestibilidade aparente total dos nutrientes, o ganho de peso, a conversão alimentar e o rendimento de carcaça em bovinos de corte recebendo dietas contendo silagem de sorgo e concentrado nas proporções 80:20, 65:35, 50 Effects of feeding sorghum silage (Sorghum bicolor (L.) Moench) with different concentrate levels on intake, nutrient digestibility, and production of beef cattle ABSTRACT -Twenty-four castrated Holstein x Zebu bovines averaging 435 kg of initial body weight and 36 months of age were assigned to a randomized complete block design (six replications/treatment) to investigate the effects of sorghum silage with different concentrate levels on intake, apparent total tract digestibility, weight gain, feed conversion, and carcass yield. Animals received the following forage:concentrate ratios: 80:20, 65:35, 50:50, and 35:65 on dry matter basis. Different forage:concentrate ratios did not change significantly intakes of DM, OM, CP, and TDN all expressed in kg/day whereas intakes of DM (% BW and g/kg BW 0.75 ) and EE and NFC both expressed in kg/day increased linearly with the concentrate level. Conversely, intake of NDF, independently of the expression form, decreased linearly when the concentrate level increased from 20 to 65% of the diet. Apparent total tract digestibilities of DM, OM, and NFC were similar across diets averaging 63.8, 65.1, and 82.2%, respectively. However, apparent total tract digestibilities of CP, EE, and NDF decreased linearly with the increment of concentrate in the diets. Both average daily gain and feed conversion were not affected by the diets averaging 1.40 g/day and 8.08 kg of DM/kg of body weight gain (BWG), respectively. The observed average final weight of the animals was 523 kg among diets in the present trial. Carcass yield of animals increased linearly when the forage:concentrate ratio went from 80:20 to 35:65. The diet with the forage:concentrate ratio of 80:20 resulted in lower meat production costs than diets with greater proportions of concentrate.

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Desempenho, digestibilidade e características de carcaça de novilhos zebuínos alimentados com dietas contendo diferentes níveis de concentrado

Cited by 30 publications

References 11 publications

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

Quantitative genetic analysis for meat tenderness trait in Polled Nellore cattle

Parâmetros nutricionais de novilhas de corte alimentadas com cana-de-açúcar tratada com óxido de cálcio e diferentes níveis de concentrado

Consumo, digestibilidade dos nutrientes e desempenho de bovinos de corte recebendo silagem de sorgo (Sorghum bicolor (L.) Moench) e diferentes proporções de concentrado

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