Viability of Lactobacillus plantarum in different protective agents and its effects on growth performance and immunity of weaned pigs

The use of Lactobacillus plantarum as a probiotic, may improve growth performance and immunity in piglets.

This experiment was conducted to evaluate the effect of different protective agents on the viability of Lactobacillus plantarum after freeze-dried and the effects of Lactobacillus plantarum on growth performance and immunity of weaned pigs. The strain of Lactobacillus plantarum was originally isolated from the gastrointestinal tract of healthy weanling pigs in laboratory and strains were identified through standard morphological, biochemical, physiological tests, and by 16s rRNA gene sequence analysis. Lactobacillus plantarum were freeze-dried for 24 h in the presence of 10 different combinations of skim milk powder, lactose, soluble starch, ascorbic acid, sodium glutamate, glycerin, L-cysteine, dextrine, and sucrose. The viable count of Lactobacillus plantarum reached 1.6 × 1012 cfu/g after freeze-dried under the protective agents of 16% skim milk powder + 2% lactose + 10% dextrin + 0.5% L-cysteine + 1.5% sodium glutamate, showed the highest viability. Sixty-four piglets weaned at 28 d of age (8.13 ± 0.35 kg BW), were divided into 4 groups comprising of control with chlortetracycline at 50 mg/kg, 3 treatments of different Lactobacillus plantarum levels (freeze-dried; 0.3%, 0.5%, and 0.7% of diet).

The results showed that the supplementation of Lactobacillus plantarum at 0.3% of diet level had the same effect on average daily gain (ADG) (405 vs. 393 g/d), feed/gain (F/G) (1.95 vs. 1.98), and mortality rate (P > 0.05) compared with chlortetracycline addition. But the 0.5% and 0.7% of diet level showed lower ADG and significant higher F/G and mortality rate compared with control (P < 0.05). Lactobacillus plantarum supplementation at any level showed significant higher antibody titers against classical swine fever (OD at 630 nm, P < 0.05).

The present study implies that freeze-dried Lactobacillus plantarum at 0.3% of diet may be the most ideal concentration in ensuring growth performance and immunity of weaned pigs compared with chlortetracycline.

J Wang, HF Ji, RL Ge, SX Wang, DY Zhang, and YM Wang, 2010. Journal of Animal Science, 88, E-Suppl. 2:384.

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Viability of Lactobacillus plantarum in different protective agents and its effects on growth performance and immunity of weaned pigs

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