The Effect of Two Sources of Soy Protein Concentrate and Hydrolyzed Soy Protein Modified on Growth and Performance of Calves Fed Milk Replacer

Abstract Text:

Fifty-one (51) 3 - 10 d old Holstein bull calves with an average initial BW of 50.1 kg (SD = 1.63 kg) were shipped from Wisconsin to the Land O’ Lakes Research Facility. Calves were randomly assigned according to BW and blood gamma globulin to one of three 20% protein/20% fat non-medicated milk replacer (MR) diets offered in a 17.6% solution. The objective of this study was to evaluate calf performance and growth when fed MR containing one of two sources of soy protein concentrate or hydrolyzed soy protein modified as a protein source. Treatments were as follows: soy protein concentrate source 1 (SPC 1; Solae Profine F, Solae, Aarhus, Denmark); soy protein concentrate source 2 (SPC 2, Solae Danpro A, Solae, Aarhus, Denmark); hydrolyzed soy protein modified (HSPM). Calves were fed to provide 680 g DM/d during days 1 – 7, 907 g DM/d during days 8 – 14, 1134 g DM/d during days 15 – 21, and 1361 g DM/d during days 22 – 28, in 2 feedings at 0600 and 1515 h. Calf starter was not offered during this 28 d trial. Data were analyzed by Mixed Procedures of SAS. Total weight gain, MR consumption, feed:gain, and scour scores did not differ (P > 0.05) among treatments. The three soy protein sources fed in this study can be interchangeably employed in calf milk replacers as all support calf growth and performance equally.

	MR Diet
Item1	SPC 1	SPC 2	HSPM	S.E.
BW Gain, kg, 4 wk total	8.69	8.58	9.36	0.710
MR Intake (DM), kg, 4 wk total	25.7	25.4	26.2	0.640
Scour Score*, 2 wk avg	1.51	1.47	1.60	0.070
Feed:Gain	3.47	3.28	3.06	0.330

* 1 - 4 scale: 1= normal, 2= loose, 3= water separation, 4= 3 with severe dehydration.

Keywords: calf, milk replacer, hydrolyzed soy protein modified