Changes in milk production and blood metabolism of lactating dairy cows fed Saccharomyces cerevisiae culture fluid under heat stress

• Published in: Journal of animal science and technology Vol. 63; no. 6; pp. 1433 - 1442
• Main Authors: Lim, Dong-Hyun, Han, Man-Hye, Ki, Kwang-Seok, Kim, Tae-Il, Park, Sung-Min, Kim, Dong-Hyeon, Kim, Younghoon
• Format: Journal Article
• Language: English
• Published: Korea (South) Korean Society of Animal Sciences and Technology 01.11.2021; 한국축산학회
• Subjects: blood metabolism; dairy cow; heat stress; milk production; saccharomyces cerevisiae; Short Communication; 축산학; Dairy cow; Blood metabolism; Heat stress; Saccharomyces cerevisiae; Milk production
• ISSN: 2055-0391; 2672-0191; 2055-0391; 2093-6281
• DOI: 10.5187/jast.2021.e114

In this study, culture fluid (SCCF) has been added to a diet of lactating dairy cows to attempt to improve the ruminal fermentation and potentially increase the dry matter intake (DMI) and milk yield. This study was conducted to investigate the effects of SCCF on the milk yield and blood biochemistry in lactating cows during the summer. Twenty-four Holstein dairy cows were randomly assigned to one of four treatments: (1) total mixed ration (TMR-1) (Control); (2) TMR-1 supplemented with SCCF (T1); (3) TMR-2 (containing alfalfa hay) (T2); and (4) TMR-2 supplemented with SCCF (T3). SCCF (5 ml/head, 2.0×10 CFU/mL) was mixed with TMRs daily before feeding to dairy cows. The mean daily temperature-humidity index (THI) during this trial was 76.92 ± 0.51 on average and ranged from 73.04 to 81.19. For particle size distribution, TMR-2 had a lower >19 mm fraction and a higher 8-19 mm fraction than TMR-1 ( < 0.05). The type of TMR did not influence the DMI, body weight (BW), milk yield and composition, or blood metabolites. The milk yield and composition were not affected by the SCCF supplementation, but somatic cell counts were reduced by feeding SCCF ( < 0.05). Feeding SCCF significantly increased the DMI but did not affect the milk yield of dairy cows. The NEFA concentration was slightly decreased compared to that in the control and T2 groups without SCCF. Feeding a yeast culture of may improve the feed intake, milk quality and energy balance of dairy cows under heat stress.