Effects of placental weight and maternal nutrition on the growth rates of individual fetuses in single and twin bearing ewes during late pregnancy
Daily changes in the curved crown-rump length (CRL) of individual fetal sheep were measured. In ewes that were adequately nourished throughout pregnancy, the fetal CRL increased by about 6.5 mm per day until at least 120 days of gestation and then the rate decreased to a minimum of 3.7 mm per day by 132 days. When ewes were fed an inadequate diet between 112 and 142 days, the rate of change in fetal CRL decreased within three days from about 6.5 to 3.7 mm per day and subsequently decreased to 2.9 mm per day by 132 days of gestation. In ewes that were adequately nourished except for a period of inadequate feeding between 112 and 132 days of gestation the fetal, CRL increased at similar rates to those in the second group until 132 days an then at 3.6 mm per day. Within each group, placental weight was correlated positively with the total increments in CRL (observed) and weight (derived) between 112 and 142 days of gestation and with the 142 days values for CRL, girth and weight. Most differences between single and twin fetuses were attributable to differences in placental weight
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| Format: | biblioteca |
| Published: |
1981
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| Subjects: | CAPRINOS, PRODUCCION ANIMAL, CRECIMIENTO, GESTACION, MEDICION DEL CUERPO, PARTOS MULTIPLES, ALIMENTACION DE LOS ANIMALES, |
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