Abstract
The aim of this study was to investigate the effects of Saccharomyces cerevisiae and its fermentation products on performance, blood hormone levels and rumen floral composition in peripartum dairy cows. Sixty perinatal cows were selected and allocated to two groups according to parity and expected date of delivery. Each group was supplemented with Saccharomyces cerevisiae and its fermentation product 0 or 100 g. The results showed that Saccharomyces cerevisiae and its fermentation products could significantly increase the feed intake of peripartum dairy cows (P β-hydroxybutyrate (P = 0.01), reducing the insulin content (P = 0.02). Saccharomyces cerevisiae reduced the abundance of rumen microbes in peripartum dairy cows but had no effect on rumen microbial diversity. Compared with the control group, the supplemented group showed reductions in the abundance of genera Bacillus (P = 0.03), Butyrivibrio (P = 0.01), Denitrobacterium (P = 0.01), and Mogibacterium (P Porphyromonas (P = 0.05), Saccharofermentans (P Sphaerochaeta (P = 0.02), Streptococcus (P = 0.04) and other genera. There were significant increase in the content of Acidaminococcus (P = 0.03), Allisonella (P Bulleidia (P Corynebacterium (P = 0.01), Dialister (P Faecalibacterium (P = 0.02), Faekalitalea (P = 0.03), Fibrobacter (P = 0.04), Flavobacterium (P = 0.03), Kandleria (P Paraprevotella (P Pyramidobacter (P = 0.05), Roseburia (P Succinivibrio (P The main metabolic pathways such as tryptophan metabolism and steroid hormone biosynthesis in perinatal dairy cows were determined for Saccharomyces cerevisiae and its fermentation products.
Highlights
The perinatal period is called the transition period
The aim of this study was to investigate the effects of Saccharomyces cerevisiae and its fermentation products on performance, blood hormone levels and rumen floral composition in peripartum dairy cows
The results showed that Saccharomyces cerevisiae and its fermentation products could significantly increase the feed intake of peripartum dairy cows (P < 0.01), increase the lactose content after 21 days postpartum (P < 0.01), and tend to increase milk production (P = 0.052)
Summary
The perinatal period is called the transition period. It is the period from the late pregnancy of the cow to the beginning of lactation. It generally refers to the cow 21 days perinatal period to 21 days postpartum period [1] It is characterized by the need for a large amount of energy for lactation. Fat metabolism causes an increase in ketone body content to cause ketosis This seriously affects the normal reproductive and digestive physiology of the cows, disturbs the metabolism of nutrients, and regulates neuroendocrine, which in turn leads to nutritional metabolic disorders and even illness. These will reduce the performance of the cow in the lactation cycle. Jami suggested that milk fat production showed a significant positive correlation with F/B (proportion of Copticella and Bacteroides) and a significant negative correlation with P. vivax under Bacteroides [4]
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