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The bull calf faces several challenges, e.g., new environment and pen mates after it is shipped from the dairy herd to the veal calf production at 2 to 6 weeks of age. Commingling increases the infection level in the herd and stress level of the calf (O’Connor et al., 2005). Stress triggers the secretion of adrenal corticosteroids, which may suppress immune function (Seymour et al., 1995). Additionally, the young calf is especially vulnerable to diseases in the period right after shipping as the adaptive immune system has not yet acquired an immunological memory. Thus, the calf is mainly protected by the innate immune system and the passively transferred immunity from colostrum (Galvao et al., 2005), but blood immunoglobulin G (IgG) levels usually decline during the first weeks of life (Roodposhti and Najafgholi, 2012). Both prior and around the time of weaning, enteric diseases and subsequent problems dehydration are major health issues affecting these calves (Magalhaes et al., 2008). Treatments of enteric diseases are often related to increased use of antibiotics, which can constitute a threat to human health as it increases the risk of developing multiple antibiotic-resistant bacteria (Baynes et al., 2016). ABSTRACT. The aim of the study was to investigate the effects of a product ‘ZooLac Bovimix’, containing yeast (Saccharomyces cerevisiae) and a postbiotic product from Lactobacillus acidophilus, on the performance and health of young rosé veal calves. In total 120, mainly Holsteins, bull calves arrived at a Danish rosé veal production over a period of three months. On arrival, the calves were either allocated to a control diet (CON) (25.3 ± 1.3 days and 55.1 ± 1.3 kg) or a diet with the yeast/lactobaccilus (PRO) (25.3 ± 1.0 days and 55.3 ± 0.8 kg) for six weeks. PRO calves received the yeast/lactobacillus product in the milk replacer and the concentrate. The product constituted 0.09% of dry matter (DM) in the concentrate and 1.5% of DM in the milk replacer. All calves were fed milk replacer for four weeks and had access to concentrates for all six weeks. Manure was sampled twice, around days 14–17 and 28–31, and blood was sampled on days 3 and 28–35. The growth performance was significantly higher for PRO calves, while the product did not affect the number of veterinary treatments and DM content in the manure. Serum metabolites were similar between the treatments at the first sampling. However, the concentrations of total protein and immunoglobulin G were significantly higher in the serum from PRO calves at the second sampling. Thus, supplementation of the yeast/lactobacillus product in the diet of young rosé veal calves did not affect the overall health but had a positive effect on growth performance. Received: 20 November 2019 Revised: 22 April 2020 Accepted: 8 June 2020

journal of animal and feed sciences

Performance and health of young rosé veal calves supplemented with yeast (&lt;i&gt;Saccharomyces cerevisiae&lt;/i&gt;) and a postbiotic from &lt;i&gt;Lactobacillus acidophilus&lt;/i&gt;