978 resultados para Substituto ósseo


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O trabalho foi realizado com objetivo de realizar um estudo alométrico dos tecidos ósseo, muscular e adiposo na meia carcaça esquerda de cordeiros em crescimento. Foram utilizados 36 cordeiros machos inteiros, sendo 24 Santa Inês e 12 Bergamácia. Os animais foram confinados em gaiolas individuais e alimentados ad libitum. O abate ocorreu quando os animais atingiram os pesos vivos de 15, 25, 35 e 45 kg. Após a carcaça ter sido limpa e resfriada, foram obtidos os cortes comerciais a partir da meia carcaça esquerda. A quantidade dos diferentes tecidos foi obtida a partir da dissecação da perna, do lombo, da costeleta, costela/fralda e paleta. A quantidade total dos tecidos ósseo, muscular e adiposo foi obtida pela adição das quantidades de cada corte comercial. O estudo do desenvolvimento relativo da composição tecidual foi feito por meio do modelo de HUXLEY (1932). Constatou-se crescimento heterogônico negativo (b < 1) para o tecido ósseo, crescimento isogônico (b =1) para o tecido muscular e heterogônico positivo (b > 1) para a gordura, em relação ao peso da ½ carcaça.

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The effect of protein or energy restriction during the second week post-hatching on body weight gain and femur development of broiler chickens reared at different environmental temperatures (18°C, 25°C and 33°C) was studied. From 1 to 7 days of age and after a restriction period broilers were fed on a control diet with 2850 kcal ME/kg and 20% crude protein. From 8 to 14 days of age, two groups of broilers were fed on restricted energy and protein diets with 2565kcal ME/kg and 20% of crude protein or 2850kcal ME/kg and 15% of crude protein, respectively. At 14, 21, 28, 35 and 42 days, the bones were weighed and the length and width of bones measured. The protein restriction reduced the body weight gain and the diameter of bone at second week of life. After 21 days of age no differences between treatments for these traits were observed. The body weight gain and femur growth were not affected by energy restriction. The high temperature (33°C) reduced weight gain and femur diameter from 21 to 42 days of age, and femur length at 42 days of age. The protein restriction at second week or the high environmental temperature after 21 st day of life decreased body weight gain and femur growth of broiler chickens.

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Hyperthyroidism is the most frequent endocrine disease in old-aged cats. It is a illness provoked by the excess of circulating thyroid hormones. Hyperthyroidism causes alteration in bone metabolism with predominance of activity resorption. The evaluation of bone metabolism can be made by measuring serum and urinary markers of bone metabolism or bone mineral densitometry. Osteoblasts are responsible cells for bone formation while the osteoclasts are for resorption. In physiological situation osteoblastic and osteoclastic activities are in balance. Markers of bone formation express the osteoblastic activity and markers of the osseous resorption the osteoclástica activity. Markers of bone turnover are important in the diagnosis and prognostic of muscle-skeletal disease, as well as in the accompaniment of therapy. It is fundamental do carry on studies on the influence of feline hyperthyroidism on markers of bone formation and resorption in bone turnover to comprise pathophysiologic mechanism of bone alterations.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Alimentos e Nutrição - FCFAR