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Partial Substitution of Milk Protein with Spray-Dried Fish Solubles or Soy Protein Concentrates in Calf Milk Replacers¹

Department of Animal Science, Michigan State University, East Lansing 48824

ABSTRACT

Male Holstein calves received at 4 days of age milk replacers as the only nutrients for 6 wk. Percent and source of protein were 1) 13% milk; 2) 19% milk; 3) 19% with 13% from milk and 6% from spray-dried fish solubles; 4) 19% with 13% milk and 6% soy protein concentrate; 5) 19% with 13% milk, 3% spray-dried fish solubles, and 3% soy protein concentrate; 6) 23% milk; 7) 23% with 13% milk and 10% spray-dried fish solubles. This report is to help explain how in a three-location comparison growth and health were poorer from fish solubles than from all milk protein with soy protein intermediate.

Amino acids in blood plasma sampled at 3 and 6 wk of age showed higher total essential amino acids for 19 and 23% than for 13% milk protein or milk substitute diets. A xylose absorption test at 6 wk showed no impaired capacity of gut absorption from feeding lower quality protein.

Organic matter was less digestible for diets containing fish solubles (75.7%) and soy protein concentrate (78.7%) than for milk protein (90.6%). Nitrogen retention showed similar patterns.

Superior performance on milk protein was associated primarily with higher digestibility of organic matter, greater nitrogen retention, and higher concentrations of essential amino acids in plasma.

¹ Published with approval of Director of the Agricultural Experiment Station as Journal Article No. 9995. Partially supported by the Zapata Haynie Corp., Houston, TX 77002.