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Chinese herbal medicine has been used for more that 2000 years to prevent and treat many diseases. The advantages of herbs are also used as health and production promoters in the animal husbandry. Herbs provide such nutrients as peptides, proteins, essential amino acids, starch, oligosaccharides, vitamins, fatty acids and organic trace minerals, and as well, possess many bioactive ingredients with antibacterial, immune enhancement and stress reduction properties (Guo et al., 2004). Also, previous studies on Chinese herbs as feed additives have shown that these herbs can modulate the immune response, nutritional metabolism and intestinal health of foodproducing animals (Gong et al., 2014). In recent years, the Chinese herbal medicine industry has been rapidly developed due to the continuous increase in the application of Chinese herbal medicine resources. This extensive use has resulted in an increased yield in Chinese herbal medicine residue. Moreover, due to poor extraction efficiency, the herbal residue still contains more than 30–50% medicinally active ingredients (Meng et al., 2017). Tongmai formula is a popular Chinese herbal medicine preparation composed of three traditional ABSTRACT. The aim of the present study was to investigate the effects of dietary inclusion of Tongmai granule residue (TGR) on growth performance, nutrient digestibility, blood biochemical parameters and rumen fermentation in sheep. Twenty-four healthy Doper × Small Tail Han hybrid female lambs (6–7 months of age; 29.64 ± 1.80 kg initial body weight) were randomly allocated into 3 groups and fed diets to which 0, 10 and 15% TGR were added for 75 days. It was shown that TGR dietary inclusion at the level of 15% decreased growth performance, neutral detergent fibre apparent digestibility, rumen contents of acetic, propionic, butyric acids and total volatile fatty acids (P < 0.05), but increased crude fat and organic matter (OM) apparent digestibilities, serum high-density lipoprotein cholesterol, immunoglobulin (Ig)A, IgG, IgM, rumen pH, NH3-N concentration and acetic:propionic acid ratio in lambs (P < 0.05). In the 10% TGR group, OM apparent digestibility and IgA also increased (P < 0.05), however, no negative effects on average daily weight gain, rumen pH, NH3-N, volatile fatty acids concentration and blood biochemical parameters were observed. So, it is suggested that TGR could be used as a feed source in sheep production, and 10% TGR inclusion is the most suitable dose. Received: 17 January 2021 Revised: 7 March 2021 Accepted: 10 March 2021

journal of animal and feed sciences

Effects of dietary inclusion of Tongmai granule residue on growth performance, nutrient digestibility, blood biochemical parameters and rumen fermentation in sheep