The physiological dissimilarities of Holstein dairy cows with different milk yields.
Vet Med Sci
; 9(1): 429-442, 2023 Jan.
Article
in En
| MEDLINE
| ID: mdl-36251757
ABSTRACT
BACKGROUND:
Even if breed, parity, dietary and environmental management are same, dairy cows still have notable differences in milk yield that may be underpinned by physiologic differences.OBJECTIVES:
This study aimed to investigate the physiological dissimilarities of dairy cows with different milk yields.METHODS:
Thirty cows were sorted into high milk-yielding cows (group H 58.93±2.31 kg/day), moderate milk-yielding cows (group M 44.99±0.54 kg/day), and low milk-yielding cows (group L 24.99±6.83 kg/day) according to milk yield. Blood was collected and serum parameters were assessed. Rumen fluid was collected for the evaluation of rumen fermentation parameters (RFPs) and bacterial community composition (BCC).RESULTS:
Serum prolactin, growth hormone, glutathione peroxidase, immunoglobulin A and non-esterified fatty acid had a significantly positive correlation with milk yield (p < 0.05), whereas serum glucagon and total antioxidant capacity had a significantly negative correlation with milk yield (p < 0.05). The concentration of valeric acid and the ratio of acetic acid to propionic acid in the rumen fluid in group H was significantly lower than that in group L (p < 0.05). The concentration of acetic acid and butyric acid in group H was significantly lower than that in groups M and L (p < 0.05). The relative abundances of Ruminococcaceae_NK4A214_group, Prevotella_1, Rikenellaceae_RC9_gut_group, Christensenellaceae_R-7_group, Muribaculaceae, and Ruminococcus_2 were negatively correlated with milk yield, whereas the relative abundance of Succinivibrionaceae_UCG-001, Lachnospiraceae_NK3A20_group, Shuttleworthia and Dialister were positively correlated with milk yield (p < 0.05).CONCLUSIONS:
This study indicates that dairy cows with different milk yields have clear divergence in serum indicators, RFPs, BCC and rumen microbial metabolism.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Lactation
/
Milk
Limits:
Animals
/
Pregnancy
Language:
En
Journal:
Vet Med Sci
Year:
2023
Document type:
Article