Studies on the TDN Requirements of Pregnant and Lactating Ewes

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Abstract
Two experiments were conducted to determine the TDN requirements of ewes during the last 6 weeks of gestation and the first 90 days of lactation and to determine any interaction between levels of energy fed before and after lambing. In the first experiment 110 ewes were allotted to treatments in a 2 × 2 × 3 factorial arrangement. Treatments included two levels of TDN (100% and 125% of 1957 N.R.C.) during gestation and lactation and three creep rations: hay only; hay+corn, SBOM; hay+calf starter. In the second experiment, 130 ewes were allotted to a 3 x 3 x 2 factorial arrangement of treatments, which included three levels of TDN (75%, 100% and 125% of N.R.C.) during late gestation and lactation and a separation of single and twin lambs. One hundred and forty-three lambs were born the first year and 188 the second. The results are summarized as follows: Copyright © 1963. American Society of Animal Science . Copyright 1963 by American Society of Animal Science

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