In:
Animal Bioscience, Asian Australasian Association of Animal Production Societies, Vol. 34, No. 11 ( 2021-11-01), p. 1784-1793
Abstract:
Objective: An experiment was conducted to evaluate the effects of bamboo leaf extract (BLE) on the production performance, rumen fermentation parameters, and rumen bacterial communities of heat-stressed dairy cows.Methods: The experiment comprised a 14-day adaptation period and a 21-day experimental period and was conducted in a high-temperature and humidity environment (daily mean ambient temperature = 33.5°C±1.3°C; daily mean relative humidity = 64.9%±0.8%, daily mean temperature-humidity index = 86.2±0.4). Twelve Holstein dairy cows were randomly allocated into two groups. A total mixed ration supplemented with BLE at 0 (CON) and 1.3 g/kg dry matter (DM) were fed, respectively. Feed intake and milk yield were recorded daily. Milk samples were collected on 1, 11, and 21 d of the experimental period to analyze milk performance. Rumen fluid samples were collected on 21 d of the experimental period to analyze rumen fermentation parameters and rumen bacterial communities.Results: Compared with the control group, supplementation of BLE increased milk yield (p 〈 0.01), milk fat yield (p = 0.04), 4% fat-corrected milk (p 〈 0.01) and milk fat content (p 〈 0.01); reduced somatic cell count (p 〈 0.01). No differences in DM intake and milk protein or lactose content were observed between two groups. Supplementation of BLE also increased the rumen total volatile fatty acid (p 〈 0.01), acetate (p 〈 0.01), butyrate (p 〈 0.01), and valerate (p = 0.05) concentrations. However, no significant effects were observed on rumen pH, ammonia nitrogen, propionate, acetate/propionate ratio, isobutyrate, or isovalerate. Furthermore, BLE increased the rumen bacterial abundance and the diversity of the rumen bacterial community. The BLE reduced the Firmicutes/Bacteroidetes abundance ratio and increased the abundances of Butyrivibrio_2 (p 〈 0.01) and Ruminococcus_2 (p 〈 0.01).Conclusion: The BLE supplementation at 1.3 g/kg DM could improve production performance and rumen fermentation in dairy cows during heat stress.
Type of Medium:
Online Resource
ISSN:
2765-0189
,
2765-0235
Language:
English
Publisher:
Asian Australasian Association of Animal Production Societies
Publication Date:
2021
detail.hit.zdb_id:
3055169-9
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