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Spray-Dried Fish Solubles or Soy Protein Concentrate in Milk Replacer Formulations¹

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

J. L. Morrill, R. K. Brownson and A. D. Dayton

Departments of Animal Science and Industry and Statistics, Kansas State University, Manhattan 66506

H. J. S. Harrison and R. G. Warner

Department of Animal Science, Cornell University, Ithaca, NY 14853

ABSTRACT

Holstein calves (168) at Cornell University, Kansas State University, and Michigan State University were used to test the partial substitution of spray-dried fish solubles and soy protein concentrate for milk protein in milk replacers. Calves were placed on experiment between 3 and 8 days of age and were fed experimental diets as the only source of nutriets for 6 weeks. Replacers were reconstituted with water to 14% solids and fed at 8, 9, 10, 11, 12, and 12% body weight from 1st to 6th week. Calves were fed twice daily from open pails. Experimental diets consisted of 1) 13% crude protein as milk protein; 2) 19% crude protein as milk protein; 3) 19% crude protein, 13% as milk protein, 6% as spray-dried fish solubles; 4) 19% crude protein, 13% as milk protein, 6% as soy protein concentrate; 5) 19% crude protein, 13% as milk protein, 3% as spray-dried fish solubles, 3% as soy protein concentrate; 6) 23% crude protein as milk protein; 7) 23% crude protein, 13% as milk protein, 10% as spray-dried fish solubles. Diets containing fish solubles or soy protein were supplemented with methionine and lysine.

Average daily body weight gains were higher for diets 2 and 6 containing high milk protein, intermediate for 4 containing 6% protein from soy protein concentrate, and lower for the negative control (diet 1) and diets containing spray-dried fish solubles (3, 5, 7). Fecal scores, treatment of sicknesses, and rectal temperatures were higher for diets containing spray-dried fish solubles. On diet 7, mortality rate was 30% compared to a mean of 12% for other diets, indicating that 10% protein from spray-dried fish solubles was excessive.

¹ Published with approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 9749 and as Kansas State No. 81-212-j. Partially supported by the Zapata Haynie Corp., Houston, TX 77002.