[Effect of food consumption restriction in adult rats on the growth and tissue composition of their suckling offspring].
The repercussion of food restriction consumed by the adult rat during pregnancy and lactation, on the postnatal growth and tissue composition of the young was evaluated during lactation. Two groups of Sprague-Dawley rats were used, one control group was fed "ad libitum" (AL) and the other group, a restricted diet (RD), 30% less of the normal diet. From the eight day of pregnancy and throughout lactation, the food intake and weight of the animals was registered daily. At birth the number of young was adjusted to eight and the weight and tail length were registered daily. At 7, 14, and 21 days of lactation the young of both groups were sacrificed. The liver and the muscles of the extreme posterior were dissected and the wet weight, dry weight, proteins and nucleic acids determined. The mother rats fed "ad libitum increase their intake to 300% from the first day of lactation and they presented a greater body weight than those rats under restricted diet, also begun on the first day of lactation. At birth there were no differences in the weight and the length of the young, however at the end of the lactation the growth rate was significantly lower among the group of rats RD. In the group of young under RD, protein and nucleic acids concentration in the liver were significantly less than those of the AL group and similarly in the muscle, the dry weight, proteins, RNA and DNA were significatively less. From these results it is concluded that the food restriction of the adult rat by 30% during lactation, has a negative effect on the postnatal growth of the young, in terms of weight, length, liver tissue composition and muscular mass.
Barbosa
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L
Unidad de Investigación Médica en Nutrición, Hospital de Pediatría, Centro Médico Nacional, Instituto Mexicano del Seguro Social (IMSS)-México D.F.
De Santiago
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D000818:Animals; D000833:Animals, Suckling / Q000254:growth & development*; D001835:Body Weight / Q000502:physiology; D005260:Female; D005508:Food Deprivation / Q000502:physiology*; D006128:Growth / Q000502:physiology*; D007774:Lactation / Q000502:physiology; D008099:Liver / Q000737:chemistry*; D009132:Muscles / Q000737:chemistry*; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley
Efecto de la restricción en el consumo de alimento de la rata adulta sobre el crecimiento y la composición tisular de la cría lactante.