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Diarrhoea is a major cause of morbidity and mortality in young calves. Additionally, incidences of diarrhoea negatively affect the growth performance and increase the veterinary, feed, and labour costs (Cho and Yoon, 2014). The treatment of diarrhoea in calves often involves the use of antibiotics. The antibiotic therapy in animal production can constitute a threat to human health as it increases the risk of developing multiple antibiotic-resistant bacteria (Baynes et al., 2016). Therefore, strategies to maintain the animal health with a reduced use of antibiotics are searched for. Manipulation of the gastrointestinal tract (GIT) microbiota through supplementation of feed additives, such as proand postbiotics, is an attractive approach to improve and maintain animal health (Fomenky et al., 2017), and thus, lower the use of antibiotics in animal production. Probiotics are live non-pathogenic microorganisms that, when administered in adequate amounts, enhance the ABSTRACT. The effects of the product ‘ZooLac Bovimix’ on the gastrointestinal tract of rosé veal calves before weaning were investigated. The product contained live yeast (Saccharomyces cerevisiae) and a postbiotic from Lactobacillus acidophilus. Twelve calves were randomly allocated to a control diet (CON; 20.8 ± 1.5 days of age and 53.8 ± 3.8 kg body weight) and twelve calves were allocated to a treatment supplemented with the product in the milk replacer and concentrate (PRO; 23.7 ± 1.8 days of age and 52.8 ± 0.9 kg body weight) for three weeks. The CFUs of yeast were 7.88 x 109 and 2.38 x 109 per kg milk replacer and concentrate as feed, respectively. The number of some microbiota groups, concentration of organic acids, and biogenic amines in digesta from the mid-small intestine and mid-colon were measured. In PRO group significantly higher numbers of yeast cells in both the small intestine and colon in comparison to CON group were noted. Additionally, PRO group tended (P = 0.06) to have a lower number of Clostridium perfringens in the colon. In both the small intestine and colon, concentrations of the individual and sum of organic acids were unaffected by the treatment. The concentrations of the individual biogenic amines in the small intestine and colon were also unaffected by the treatments. However, PRO group tended to have a lower total concentration of biogenic amines in the colon (P = 0.06). So, the supplementation of the product had only minor effects on the gastrointestinal tract of pre-weaned rosé veal calves. Received: 11 August 2020 Revised: 20 October 2020 Accepted: 1 December 2020

journal of animal and feed sciences

Effect of dietary supplementation of Saccharomyces cerevisiae and a postbiotic from &lt;i&gt;Lactobacillus acidophilus&lt;/i&gt; on the concentration of organic acids, biogenic amines, and microbiota in the small intestine and colon of rosé veal calves