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1.
Meat Sci ; 96(3): 1258-65, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24334048

RESUMO

The effect of varying concentrate composition to include 5% linseed and 200 IU of vitamin E on the growth performance, fatty acid composition, and muscle color during shelf life was assessed in 46 young Pirenaica bulls finished to two fatness levels. Adding 5% linseed lowered the dressing rate without altering daily gain or carcass classification. It likewise did not alter the total saturated, monounsaturated, or polyunsaturated fatty acids in the intramuscular fat, though the percentage of α-linolenic acid and n-3 fatty acids increased significantly while the n-6 fatty acid to n-3 fatty acid ratio decreased. Higher subcutaneous fat cover depth at slaughter increased the total percentage of oleic acid and monounsaturated fatty acids without affecting the percentage of saturated or polyunsaturated fatty acids. Adding 200 IU of vitamin E in addition to linseed did not alter the color of film-wrapped fresh meat during storage in darkness.


Assuntos
Ração Animal , Ácidos Graxos Ômega-3/análise , Ácidos Graxos Ômega-6/análise , Linho/química , Carne/análise , Músculo Esquelético/química , Fenômenos Fisiológicos da Nutrição Animal , Animais , Bovinos , Cor , Embalagem de Alimentos , Armazenamento de Alimentos , Masculino , Gordura Subcutânea/química , Vitamina E/administração & dosagem
2.
Meat Sci ; 94(2): 208-14, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23501252

RESUMO

Forty-eight young Holstein bulls (slaughtered at 458.6±9.79 kg body weight) were used to evaluate the effect of whole linseed and conjugated linoleic acid (CLA) supplementation on animal performance, adipose tissue development, and carcass characteristics. The animals were fed with one of four isoenergetic and isoproteic diets: control (0% linseed, 0% CLA), linseed (10% linseed, 0% CLA), CLA (0% linseed, 2% CLA), and linseed plus CLA (10% linseed, 2% CLA). Animal performance and carcass characteristics were unaffected by diet composition. Adding linseed or CLA to the concentrate diet did not result in significant differences in adipocyte size and number or lipogenic enzyme activity. However, while the frequency distribution of subcutaneous adipocyte diameters followed a normal distribution, the frequency distribution of intramuscular adipocyte diameters was not normal in any dietary group (skewness coefficients: 0.8, 1.2, 0.9, 0.8 for control, linseed, CLA, and linseed plus CLA, respectively; P<0.05), indicative of adipocyte proliferation in the intramuscular adipose tissue.


Assuntos
Tecido Adiposo/crescimento & desenvolvimento , Composição Corporal/efeitos dos fármacos , Dieta/veterinária , Linho/química , Ácidos Linoleicos Conjugados/farmacologia , Rúmen/fisiologia , Tecido Adiposo/efeitos dos fármacos , Ração Animal , Fenômenos Fisiológicos da Nutrição Animal , Animais , Bovinos/crescimento & desenvolvimento , Bovinos/metabolismo , Bovinos/fisiologia , Ácidos Linoleicos Conjugados/química , Masculino
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