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Performance of calves fed starter and grower diets formulated with inorganic, organic, or organic trace minerals with additives from birth to 6 months of age.

E. Dufour

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06-22-2020

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Abstract:

M104
Performance of calves fed starter and grower diets formulated with inorganic, organic, or organic trace minerals with additives from birth to 6 months of age.
D. Ziegler1, H. Chester-Jones1, B. Ziegler2, A. Manthey2, E. Dufour*2, K. Mjoun3. 1University of Minnesota Waseca, MN, 2Hubbard Feeds Mankato, MN, 3Alltech Nicholasville, KY.

One-hundred six (2 to 5 d old) Holstein heifer calves (40.0 � 0.57 kg) from 2 commercial dairies were randomly assigned to 1 of 3 calf starter (CS) treatments formulated with different trace minerals (TM) and additives to evaluate performance and health during the 56-d nursery phase (NP) and the 112-d grower phase (GP). All calves were fed a non-medicated 20% CP: 20% Fat milk replacer (all-milk protein) fed at 0.28 kg in 2 L of water 2� daily from d 1 to 35 and 1x daily from d 36 to weaning at d 42. Calves were fed a medicated (Decoquinate at 45.4 g/ton) 18% CP texturized CS free choice in the NP. Treatments were as follows: 1) CS formulated with inorganic TM (INORG); 2) CS formulated with organic TM (ORG); 3) CS formulated with organic TM and an additive containing yeast products, DFM's and other additives (ORGAD). In the GP, calves were fed by treatment in group pens and offered 2.73 kg of grain mix medicated with Monensin at 39 g/ton supplemented as in NP and fed hay free choice daily. Data were analyzed using the PROC mixed procedure of SAS and repeated measures analyses applied where appropriate. There was a trend (P = 0.08) for increased ADG in the NP for calves fed ORGAD compared with ORG with INORG being intermediate, averaging 0.70, 0.64 and 0.66 kg/d, respectively. Total CS intake in NP was lower (P < 0.05) for calves fed ORG compared with INORG and ORGAD averaging 44.7, 50.0 and 51.6 kg, respectively. Health costs trended higher (P = 0.09) in the NP for calves fed INORG compared with ORG and ORGAD averaging 0.75, 0.22 and 0.17 $/d, respectively. In the GP, there was a trend (P = 0.07) for increased ADG for calves fed ORGAD compared with calves fed INORG with ORG being intermediate averaging 1.02, 0.98 and 0.99 kg/d, respectively. In the GP there was no difference (P > 0.05) in total DMI/d or gain:feed averaging 3.91 kg/d and 0.27, respectively. Under conditions of this study there was no measured benefit to feeding an organic compared with an inorganic TM in the NP or GP. The addition of additives to an organic TM mix may improve calf health and performance.

Keywords: calf performance, trace minerals, calf starter.