Desempenho e características das fibras musculares esqueléticas de cordeiros nascidos de ovelhas que receberam suplementação alimentar em diferentes períodos da gestação

Mexia, Alexandre Agostinho; Macêdo, Francisco de Assis Fonseca de; Macedo, Rosa Maria Gomes de; Sakaguti, Eduardo Shiguero; Santello, Graziela Aparecida; Capovilla, Luiz Carlos Tadeu; Zundt, Marilice; Sasa, Aya

doi:10.1590/s1516-35982006000600028

Cited by 13 publications

(11 citation statements)

References 17 publications

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“…The myofiber diameter and number as well as weight and size of lamb hindlimb muscles are probably not traits that can be changed by supplementation of dams during gestation, regardless of the period, as has been reported by Mexia et al (2006) for the semitendinosus muscle of lambs raised on pasture with supplementation.…”

Section: Resultsmentioning

confidence: 82%

Influence of feeding regime and finishing system on lamb muscle fiber and meat quality

et al. 2009

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-The study verified the influence of different nutritional levels of the dams, before parturition, the weaning age of the lambs and the finishing system on lamb muscle fiber morphology and meat quality. Ile-de-France × Bergamacia crossbred dams grazing on natural grassland were divided into two groups: 1) nutritional supplement 30 days before the parturition (SUPL), and 2) no nutritional supplement (NS). These groups were further subdivided by weaning age of the lambs, which corresponded to either 45 or 60 days. The weaned lambs from each of the previous groups were also divided into different finishing systems: confined and fed a complete diet (CD), confined and fed hay (H) and kept on grassland (P). The lambs were slaughtered at 30 kg live weight (CD and P), or at 150 days of age (H). The carcasses were cooled at 4°C/24h. The analyzed variables were: longissimus dorsi muscle fiber morphophysiology, post mortem myofibrillar fragmentation (at 0, 3 and 7 days post mortem), meat pH and temperature. There was no effect of supplementation of dams or weaning age of the lambs for the evaluated variables. The frequency of slow-oxidative (SO), fast-oxidative-glycolytic (FOG) and fast-glycolytic (FG) muscle fiber types was not altered by the treatments, but the fiber cross-sectional area was smaller for the lambs finished only on hay, and the meat pH values and temperature were lower and the myofibrill fragment dimensions were smaller. As time maturation increased from 0 to 3 and 7 days post mortem, there was a decrease in the length of the myofibrill fragments. The diet of the lambs which were maintained confined and fed only with hay was nutritionally inferior when compared with all the others, and this changed the quality of the meat compared to the finishing systems on grassland or confined and fed complete diet.Key Words: muscle fiber type, myofibrill, morphology, pH, temperature Influência do regime alimentar e do sistema de terminação sobre as fibras musculares e a qualidade da carne de cordeiros RESUMO -Avaliou-se a influência dos níveis nutricionais da ovelha antes do parto, da idade à desmama e do sistema de terminação sobre as fibras musculares e a qualidade da carne dos cordeiros. Utilizaram-se matrizes mestiças Ile de France × Bergamacia criadas a pasto. As ovelhas foram divididas em dois grupos: um com suplementação alimentar 30 dias antes do parto e outro sem suplementação. Os animais (ovelha e cordeiros) foram subdivididos de acordo com a idade à desmama (45 ou 60 dias de idade) e os cordeiros desmamados foram submetidos a três sistemas de terminação: confinamento com dieta completa; confinamento somente com feno; e confinamento somente no pasto. O abate dos cordeiros foi realizado aos 30 kg de peso vivo ou aos 150 dias de idade. As características de carcaça analisadas foram morfofisiologia da fibra do músculo longissimus dorsi, fragmentação miofibrilar pós-morte (maturados nos dias 0, 3 e 7 pos mortem) e redução do pH e da temperatura da carne pós-abate. Não houve efeito da suplementação às ove...

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Section: Resultsmentioning

confidence: 82%

Influence of feeding regime and finishing system on lamb muscle fiber and meat quality

et al. 2009

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“…A determinação do diâmetro foi obtida pela mensuração do menor diâmetro das fibras (Dubowitz & Brooke, 1973 (Mexia et al, 2006). Para determinação dos coeficientes de digestibilidade, foram utilizados 21 peixes com peso médio de 258,7 ± 27,3 g. Foi determinado o coeficiente de digestibilidade aparente no tempo de cada ração, em duplicata, considerando repetição o pool de fezes dos peixes de cada aquário.…”

Section: Methodsunclassified

Redução da proteína em dietas para tilápias-do-nilo por meio da suplementação de aminoácidos com base no conceito de proteína ideal

Righetti¹,

Furuya

Conejero³

et al. 2011

R. Bras. Zootec.

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RESUMO -Este trabalho foi realizado para avaliar os efeitos da redução da proteína da dieta, por meio da suplementação com aminoácidos sintéticos, sobre o desempenho produtivo, a digestibilidade e o diâmetro da fibra muscular de tilápias-do-nilo. Os aminoácidos (lisina, metionina, treonina e arginina) foram suplementados de forma a manter o perfil de aminoácidos da dieta-referência. Foram utilizados 160 peixes com peso vivo médio inicial de 105,7 ± 2,5 g, distribuídos em 16 tanques (1 m 3 cada) e alimentados com dietas contendo 26,74; 25,82; 23,09 ou 22,16% de proteína digestível durante 110 dias. Não foi observado efeito dos níveis de proteína nas dietas sobre o ganho de peso diário, o índice hepatossomático, a gordura visceral, o rendimento de filé, os teores corporais de umidade, proteína bruta e cinzas, o teor de cinzas no filé, a taxa de sobrevivência e o diâmetro das fibras do músculo dorsal. Com a redução dos níveis de proteína na dieta, foi observada redução linear dos coeficientes de digestibilidade aparente da energia bruta, proteína bruta, extrato etéreo e fósforo das dietas. Houve efeito quadrático dos níveis de proteína sobre a conversão alimentar, a taxa de eficiência proteica, a retenção de nitrogênio, o nitrogênio excretado, a umidade no filé, a gordura corporal e no filé e proteína no filé, de modo que os melhores valores foram estimados com 24,53; 24,25; 24,04; 25,15; 24,67; 24,14; 24,34; 25,11% de proteína digestível, respectivamente. É possível reduzir, de 26,74 para 24,53%, a proteína digestível em dietas para tilápias-do-nilo na fase de 100 a 500 g. Palavras-chave: aminoácido, desempenho, digestibilidade, fibra muscular, peixe Protein reduction in diets for Nile tilapia by amino acids supplementation based on the ideal protein concept ABSTRACT -The objective of this work was to evaluate the effects of reduction of protein in diets for Nile tilapia by supplementation of synthetic amino acids on performance, digestibility and diameter of muscle fiber of Nile tilapias.The amino acids (lysine, methionine, threonine and arginine) were supplemented to keep the profile of amino acids in the reference diet. It was used 160 fish with initial live weight of 105.7 ± 2.5 g, distributed in 16 tanks (1 m 3 each tank) fed diets containing 26.74; 25.82; 23.09 or 22.16% of digestible protein for 110 days. It was not observed any effects of protein levels in the diets on daily weight gain, hepatosomatic index, visceral fat, fillet yield, carcass humidity, crude protein and ash, fillet ash, survival rate and on the white muscle fiber diameter. A linear decrease on apparent digestibility coefficients, gross energy, crude protein, ether extract and phosphorus was observed when protein levels in the diet were reduced. There was a quadratic effect on feed conversion ratio, protein efficiency rate, nitrogen retention, nitrogen excretion, fillet humidity, carcass and fillet fat and fillet protein, in which the best-fit responses were estimated with 24.53, 24.25, 24.04, 25.15, 24.67, 24.14, 24.34 IntroduçãoA...

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“…The results of Mexia et al (2006), who reported an effect of birth type on daily weight gain in Santa Ines lambs, support this hypothesis.…”

Section: Body Weight and Weight Gainmentioning

confidence: 58%

Performance of the Santa Ines breed raised on pasture in semiarid tropical regions and factors that explain trait variation

Jucá

Faveri

Filho

et al. 2014

Trop Anim Health Prod

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This study aimed to evaluate sex, the number of lambs per birth, and the family effects on production traits in the Santa Ines breed of sheep by estimating the least square means and coefficient of variance for those traits. A total of 484 lambs were evaluated for the following traits: weight at birth, at weaning, and at 240 days of age; weight gain during the pre-weaning and post-weaning periods; height, width, and length of different body regions; and rib eye area and fat thickness between the 12th and 13th ribs. We observed coefficients of variation higher than 10 % for several traits. Generally, males were larger than females (P < 0.05), while lambs from single and double births were larger than lambs from triple births (P < 0.05). Family effect was significant (P < 0.05) for most traits and explained the highest percentage of residual variance. The results showed good development of Santa Ines sheep, especially during the pre-weaning period but no in post-weaning. Our study also showed that there is an effect of sex, birth type, and family, which must be included in any statistical model for the estimation of least square means and residual variance in ANOVA.

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Desempenho e características das fibras musculares esqueléticas de cordeiros nascidos de ovelhas que receberam suplementação alimentar em diferentes períodos da gestação

Cited by 13 publications

References 17 publications

Influence of feeding regime and finishing system on lamb muscle fiber and meat quality

Influence of feeding regime and finishing system on lamb muscle fiber and meat quality

Redução da proteína em dietas para tilápias-do-nilo por meio da suplementação de aminoácidos com base no conceito de proteína ideal

Performance of the Santa Ines breed raised on pasture in semiarid tropical regions and factors that explain trait variation

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