Bibliographic Details
| Title: |
Preweaning period is a critical window for rumen microbial regulation of average daily gain in Holstein heifer calves. |
| Authors: |
Xu, Shengyang1 (AUTHOR), Jiao, Chong1 (AUTHOR), Diao, Qiyu1 (AUTHOR), Tu, Yan1 (AUTHOR) tuyan@caas.cn |
| Source: |
Journal of Animal Science & Biotechnology. 11/2/2023, Vol. 14 Issue 1, p1-16. 16p. |
| Subject Terms: |
*HEIFERS, *CALVES, *CLOSTRIDIA, *RUMEN fermentation, *PROPIONATES, *FERMENTATION, *GLUCOSE |
| Abstract: |
Background: Rumen bacterial groups can affect growth performance, such as average daily gain (ADG), feed intake, and efficiency. The study aimed to investigate the inter-relationship of rumen bacterial composition, rumen fermentation indicators, serum indicators, and growth performance of Holstein heifer calves with different ADG. Twelve calves were chosen from a trail with 60 calves and divided into higher ADG (HADG, high pre- and post-weaning ADG, n = 6) and lower ADG (LADG, low pre- and post-weaning ADG, n = 6) groups to investigate differences in bacterial composition and functions and host phenotype. Results: During the preweaning period, the relative abundances of propionate producers, including g_norank_f_Butyricicoccaceae, g_Pyramidobacter, and g_norank_f_norank_o_Clostridia_vadinBB60_group, were higher in HADG calves (LDA > 2, P < 0.05). Enrichment of these bacteria resulted in increased levels of propionate, a gluconeogenic precursor, in preweaning HADG calves (adjusted P < 0.05), which consequently raised serum glucose concentrations (adjusted P < 0.05). In contrast, the relative abundances of rumen bacteria in post-weaning HADG calves did not exert this effect. Moreover, no significant differences were observed in rumen fermentation parameters and serum indices between the two groups. Conclusions: The findings of this study revealed that the preweaning period is the window of opportunity for rumen bacteria to regulate the ADG of calves. [ABSTRACT FROM AUTHOR] |
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