Version 1
: Received: 2 November 2023 / Approved: 2 November 2023 / Online: 2 November 2023 (04:12:24 CET)
How to cite:
Ramirez-Garzon, O.; Al-Alawneh, J.; Barber, D.; Liu, H.; Soust, M. Long-Term Effects of Direct-Fed Microbials on Liveweight and Milk Production in Dairy Holstein Cows. Preprints2023, 2023110122. https://doi.org/10.20944/preprints202311.0122.v1
Ramirez-Garzon, O.; Al-Alawneh, J.; Barber, D.; Liu, H.; Soust, M. Long-Term Effects of Direct-Fed Microbials on Liveweight and Milk Production in Dairy Holstein Cows. Preprints 2023, 2023110122. https://doi.org/10.20944/preprints202311.0122.v1
Ramirez-Garzon, O.; Al-Alawneh, J.; Barber, D.; Liu, H.; Soust, M. Long-Term Effects of Direct-Fed Microbials on Liveweight and Milk Production in Dairy Holstein Cows. Preprints2023, 2023110122. https://doi.org/10.20944/preprints202311.0122.v1
APA Style
Ramirez-Garzon, O., Al-Alawneh, J., Barber, D., Liu, H., & Soust, M. (2023). Long-Term Effects of Direct-Fed Microbials on Liveweight and Milk Production in Dairy Holstein Cows. Preprints. https://doi.org/10.20944/preprints202311.0122.v1
Chicago/Turabian Style
Ramirez-Garzon, O., Huanle Liu and Martin Soust. 2023 "Long-Term Effects of Direct-Fed Microbials on Liveweight and Milk Production in Dairy Holstein Cows" Preprints. https://doi.org/10.20944/preprints202311.0122.v1
Abstract
This 16-month study aimed to evaluate the extended effects of administering direct-fed microbials (DFM) on milk yield and components in 150 dairy cows. The cows were randomly divided into two groups: control (n=75) and DFM (n=75) based on parity and days in milk. Throughout the study, the two groups of cows were housed separately in a free stall yard, and each group had their own feeding area. The DFM group received 10 ml/cow of the Lacticaseibacillus- and Lentilactobacillus-based DFM via top dressing of the feed during lactation and drying off. Milk yield and liveweight were recorded daily. Milk samples were collected every two months for milk components analysis. Both groups produced less milk in the second production season due to adverse weather conditions. DFM cows gained more liveweight across the study (19.40 kg, 95% CI 0.44; 38.30) compared to controls. In the second season, DFM cows lost weight at a slower rate (-6.06, 95% CI -10.49; -1.61) during the postpartum period and produced more milk (0.39 L/d 95% CI 0.10; 0.89). Over a full lactation, DFM cows yielded at least 258L (95% CI 252L; 265L) more milk than controls. No significant differences were found in fat yield, protein yield, or somatic cell counts. The study suggests that prolonged DFM administration positively impacted milk production, but further research is needed to understand the underlying mechanism.
Keywords
Direct-fed microbial; milk yield; dairy cows
Subject
Biology and Life Sciences, Animal Science, Veterinary Science and Zoology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
