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Digestibility Measured by Fecal and Ileal Collection in Preruminant Calves Fed a Clotting or a Nonclotting Milk Replacer¹

Département de Zootechnie and Centre de Recherche en Nutrition, Université Laval, Québec, Québec G1K 7P4, Canada

M. Ivan

Animal Research Centre, Agriculture Canada, Ottawa, Ontario K1A 0C6, Canada

G. J. Brisson

Département de Zootechnie and Centre de Recherche en Nutrition, Université Laval, Québec, Québec G1K 7P4, Canada

ABSTRACT

Eight Holstein male calves, each fitted with an ileal reentrant cannula at 7 to 10 d of age, were fed a milk replacer based on low heat skim milk powder with or without an oxalate-NaOH buffer known to prevent curd formation in the abomasum. The calves were used to study the effects of milk clotting on digesta flow at the ileum and apparent digestibility measured by fecal and ileal collection. Patterns of ileal flow of total digesta, DM, N, and fat were similar for the clotting and the nonclotting milk replacers. The apparent digestibility of DM and N was higher when measured by fecal than ileal collection for both milk replacers. Digestibility of DM was higher for the clotting than for the nonclotting milk replacer when measured by ileal collection. Clotting did not affect N digestibility measured by either fecal or ileal collection. The concentration of amino acids differed generally in the ileal digesta compared with concentration in feces. In the ileal digesta, some amino acids showed lower concentrations in the clotting milk replacer fed calves compared with those fed the nonclotting milk replacer. The coefficients of digestibility of each amino acid were similar when measured by either fecal or ileal collection. Clotting had no effect on amino acid digestibility measured by both fecal and ileal collection. The data suggest that fecal collection might indicate higher digestibility as compared with ileal collection and that the absence of milk replacer clotting does not affect ileal flow and digestibility of milk replacer N and fat.

¹ Contribution Number 1471 from the Animal Research Centre.

² Present address: Research Station, Agriculture Canada, C. P. 90, Lennoxville, Québec, J1M 1Z3.