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Performance of Artificially Reared Finnsheep-Cross Lambs¹

U.S. Department of Agriculture, Beltsville, Maryland 20705

Abstract

One-hundred-sixty-eight Finnsheep-cross lambs were started on artificial rearing regimens when 18 to 24 hr. old in 1969 and 1970. Lambs were allowed "Ewelac" milk replacer at 4 C, ad libitum, until abruptly weaned from milk at an average age of 44 days in 1969 and 31 days in 1970. ADG to weaning was 0.31±0.07 kg per day in 1969 and 0.30±0.06 in 1970; death losses from birth to weaning were 2.9 and 4.0%, respectively. Two pelleted diets were compared in 1970 during the first 51 days post-weaning. Both diets contained 18% CP and 68% TDN; fishmeal supplied of the CP in the first while vegetable proteins were used in the second. ADG were 0.27±0.05 and 0.26±0.04 kg per day, respectively. ADG to 102 days, in 1969, was 0.26±0.03 kg for ewe lambs and 0.28±0.05 kg for ram lambs; ADG in 1970 was 0.21±0.02 kg for ewe lambs and 0.30±0.05 kg for ram lambs. Type of birth had no significant effect on ADG to 102 days during either year.

¹ The authors express their appreciation to P. J. Reynolds, Animal Science Research Division, ARS, Beltsville, Maryland, and L. E. Miller, Data Systems Application Division, ARS, National Agricultural Library, Beltsville, Maryland, for their biometrical and computational services, respectively.

² Animal Science Research Division, A.R.S., Agricultural Research Center.