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Effects of Soyflour in Milk Replacer Followed by a Liquid Protein Supplement on the Growth of Young Lambs¹

University of Minnesota, St. Paul 55101

Abstract

Forty-eight lambs born as twins or triplets were artificially reared to 12 weeks of age. Comparisons in a factorial design included two milk replacers (MR), (all-milk vs. 20% soy-flour), two corn and alfalfa based creep feeds, (20% soybean meal vs. 10% fish meal), and two postweaning treatments: 1) a liquid suspension of fish meal, soybean meal and glucose fed from a nipple to 8 weeks of age, and 2) a negative control, i.e., no liquid feed after weaning.

From birth to 21 days of age the lambs fed the all-milk MR gained faster (301 vs. 248 g/day; P<.05) and consumed more air dry MR (276 vs. 240 g/day; P<.05) than lambs fed the soyflour MR.

From 4 to 8 weeks of age the non-milk protein-glucose suspension fed at the rate of approximately one third of the creep feed consumption, eliminated the postweaning growth check in the lambs fed soyflour MR but had no effect on the lambs fed the all-milk MR. It is suggested that the increased utilization of protein and energy bypassing the rumen and the early adaptation of postruminal digestion to non-milk proteins in lambs fed soyflour MR, may be responsible for this effect.

¹ Paper No. 8369, Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul.

² On leave of absence from the Agricultural Research Organization, P. O. B. 6, Bet Dagan, Israel.