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Health and growth in Holstein calves fed blends of yeast products, phytogens, and direct-fed microbials in milk replacer and starter.

K. N. Brost

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06-24-2020

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Abstract:

W65
Health and growth in Holstein calves fed blends of yeast products, phytogens, and direct-fed microbials in milk replacer and starter.
K. N. Brost*1, D. M. Paulus Compart2, K. N. Russo2, J. K. Drackley1. 1University of Illinois Urbana Champaign Urbana, IL, 2Land O�Lakes Inc Arden Hills, MN.

The objective of this study was to determine if additives fed in milk replacer (MR) and starter could enhance health and growth of Holstein calves through 8 wk of age. The experiment was a randomized complete block design with 32 male calves per treatment, purchased from a commercial dairy when ≤ 3 d old. Calves were housed in individual hutches bedded with straw. Calves were fed MR (22% CP, 20% fat) at 0.6 kg (DM) daily, and starter for ad libitum intake. Treatments included: control MR and starter with no additives (CON); a commercially available blend of phytogens and yeast extract (Surmount, PMI, Arden Hills, MN) in MR and a blend of yeast products and phytogens (Victant, PMI) in starter (CTP); and an experimental blend of direct-fed microbials and phytogens (EXP-MR) in MR and a blend of yeast products, phytogens, and direct-fed microbials (EXP-S) in starter (CBP). Intakes of MR, starter, and water were recorded daily. Measurements of BW, body length, withers height, hip height, and hip width were recorded weekly. Calves were weaned on d 49. Health data were analyzed using GLIMMIX and FREQ procedures, and growth and intake data were analyzed using the MIXED procedure in SAS. The number of days calves were medicated differed among treatments (P = 0.02), with CTP medicated the least (0.69 d/calf) compared with CON and CBP (1.58 and 1.69 d/calf, respectively). Electrolyte administrations tended (P = 0.09) to be more frequent for CTP than CON or CBP. Instances of fecal scores > 2 (4-point scale) were not different (P = 0.33). Respiratory scores showed a pattern of fewer events for CON and CTP (15 and 17 events, respectively) than for CBP (34 events). Nasal discharge showed a similar numerical difference among treatments. Intakes of MR, starter, and water did not vary among treatments (P > 0.41). No differences were detected in BW or other growth measurements, except for hip width that tended to be greater for CBP than CON (P = 0.071). To conclude, CTP improved health outcomes compared with CON and CBP but did not improve growth.

Keywords: phytogen, direct-fed microbial, calf.

Biography: I am Kelli Brost, a second year Master's student in the Drackley lab at the University of Illinois Urbana-Champaign. I have had the opportunity to run two dairy calf nutrition trials, both involving the use of feed additives in milk replacer and starter grain.