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Pre- and postweaning performance and health of dairy calves fed milk replacers supplemented with a direct-fed microbial and/or brewery yeast cell wall.

D. Ziegler

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06-22-2020

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Abstract:

M110
Pre- and postweaning performance and health of dairy calves fed milk replacers supplemented with a direct-fed microbial and/or brewery yeast cell wall.
D. Ziegler*1, H. Chester-Jones1, T. Marubashi2. 1University of Minnesota Waseca, MN, 2Calpis America Inc Peachtree City, GA.

One-hundred seven (2 to 5 d old) individually fed Holstein heifer calves (39.9 � 0.66 kg) from 2 commercial dairies were randomly assigned to 1 of 4 milk replacer treatments (MR) supplemented with an organic direct-fed microbial (DFM) and/or brewery yeast cell wall (BYCW) to evaluate pre- (d 1 to 42) and postweaning (d 43 to 56) calf performance and health. The study was conducted between April and July, 2019. Treatments included: 1) all-milk protein, non-medicated MR 20% CP:20% Fat fed at 0.28 kg in 2 L of water 2� daily from d 1 to d 35 and 1� daily from d 36 to weaning at d 42, (CON); 2) MR as in CON supplemented with (BYCW) at a rate of 7.5 g daily, (BYCW); 3) MR as in CON supplemented with 5 g daily of a DFM containing Bacillus subtilis strain C-3102 (3.0 � 109 cfu/calf, d 1 to 42 ; DFM); 4) MR as in CON supplemented with 5 g daily of DFM and 7.5 g daily of BYCW, (DFMBYCW). All calves were offered a (18% CP as fed) medicated calf starter (Decoquinate at 45.4 g/ton) and water free choice from d 1 to 56. Data were analyzed using the PROC mixed procedure of SAS and repeated measures analyses applied where appropriate. There were no differences (P > 0.05) in pre- (d 1 to 42), post weaning (d 43 to 56), or overall (d 1 to 56) gains averaging 0.56, 1.07, 0.68 kg/d, respectively. Pre- (d 1 to 42) and post weaning (d 43 to 56) calf starter intake was similar across treatments averaging 18.1 and 31.6 kg total intake, respectively. There was a difference (P < 0.05) in number of days fecal score = 4 (d 1 to 42; where 1 = normal, 4 = watery), for calves fed CON averaging 0.58 d compared with 0.18 and 0.22 d respectively for BYCW and DFMBYCM with DFM being intermediate at 0.35 d. Health costs were similar across treatments. Under conditions of this study calves fed a MR supplemented with a DFM, BYCW or combination of DFM and BYCW did not affect growth or performance compared with calves fed a non-medicated MR.

Keywords: calf performance, milk replacer, direct-fed microbial.

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