Alteration of fatty acid profile of milk in Holstein cows fed Bacillus coagulans as probiotic: a field study

Document Type : Full paper (Original article)

Author

PhD student, Department of Food Hygiene and Public Health, School of Veterinary Medicine, Shiraz University, Shiraz, Iran

10.22099/ijvr.2021.38159.5558

Abstract

Background: Probiotics may improve milk quality and the general health status of animals. Aims: The effects of dietary Bacillus coagulans PRM101 on milk components, milk fatty acids and some health indicators of dairy cows were investigated. Methods: The probiotic was added to the feed of 12 Holstein cows (2 grams/cow: 2×1011 CFU/cow) for 63 days compared to a control group fed on the basal ration (n=11). Milk and blood samples were taken on days 0, 21, 42 and 63. Results: The yields of milk and energy corrected milk (ECM; computed from milk weight and its fat and protein content) decreased linearly and similarly (P=0.60) in both groups. The treatment cows, however, showed quadratic increases in the weights of milk (P=0.03) and ECM (P=0.04) at d42 of the study. ECM (d42, P<0.05) and crude protein content of milk (d42, P<0.05; d63, P<0.1) were higher in the cows receiving the probiotic. The proportions of heptadecanoic (C17:0; P=0.002) and linoleic (C18:2; P=0.077) acids in milk fat (g/100 g fat) were higher in the treatment cows on d63. Milk total antioxidant capacity (TAC), malondialdehyde (MDA), and similarly, amyloid A and haptoglobin (Hp) of milk and blood were not affected. TAC and MDA were negatively correlated in the control group (r=-0.669, P=0.005). Heptadecanoic acid correlated negatively with milk MDA (r=-0.611, P=0.035) and positively (r=0.591, P=0.043) with serum Hp in the treatment cows. Conclusion: Dietary B. coagulans PRM101 may improve the proportions of C17:0 and C18:2 fatty acids in milk. Some improvements in milk protein and the health status of the cows may also be anticipated.

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Iranian Journal of Veterinary Research

Articles in Press, Accepted Manuscript
Available Online from 16 January 2021

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