Maternal energy status and development of liver and muscle in the bovine fetus.
نویسندگان
چکیده
The effects of daily metabolizable energy intakes of 9.5 (low), 15.4 (medium) and 24.9 (high) Mcal in pregnant yearling heifers on maternal serum metaboli te concentrations and on fetal development as indicated by RNA, DNA and protein concentrations in liver and semitendinosus muscle were studied in 88 crossbred heifers. Pregnant heifers were slaughtered at 90, 120, 150, 180, 210, 240 and 255 days of gestation. Average daily gains (kg) were .14, .58 and .95 and fetus, fluids and membranes accounted for 100%, 27% and 16% of the total live weight gain of the heifers fed the low, medium and high energy diets. Maternal serum free fat ty acids (FFA) were not altered (P>.05) by maternal energy level. Glucose concentrations were highest (P<.025) and ureaN concentrations lowest (P<.025) in heifers fed high energy compared to low energy levels. Maternal liver DNA concentrations (mg/g tissue) were higher (P<.025) and the protein/ DNA ratio lower (P<.025) in the low energy diet compared to the medium or high energy diets. Concentrations of liver RNA and protein were not influenced (P>.10) in maternal liver by level of energy intake. Fetal liver and muscle
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ورودعنوان ژورنال:
- Journal of animal science
دوره 48 6 شماره
صفحات -
تاریخ انتشار 1979