The Research Center of Digestive Physiology and Pathology, Lithuanian University of Health Sciences, Veterinary Academy, Tilzes 18, LT-47181, Kaunas, Lithuania.
Natural Resources Institute Finland (Luke), Myllytie 1, FI-31600 Jokioinen, Finland.
Pol J Vet Sci. 2020 Dec;23(4):545-552. doi: 10.24425/pjvs.2020.134704.
Exogenous fibrolytic enzymes (EFE) and yeast are feed supplements that improve forage digestion in rumen, but their influences on physical reticulorumen parameters are not well studied. This study was designed to evaluate the effect of the EFE:endo-β-xylanase (37x104 U/cow/day), endocellulase (45x104 U/cow/day), endo-β-glucanase (12x104U/cow/day), and active yeast - Saccharomyces cerevisiae CNCM-1077 (10x109CFU/cow/day) supplements on reticulorumen pH (RpH) and temperature (RT) in dairy cows. Nine Lithuanian Red cows were allocated into three groups (3 cows/group): control group (C) - farm diet without supplementation, enzyme group (E) - farm diet supplemented with EFE, enzyme and active yeast group (EY) - farm diet supplemented with EFE and active yeast. The feeding trial lasted for 60 d. All cows were equipped with reticuloruminal telemetric pH and temperature sensor device. Data provided by the device were used to calculate the mean RpH (RpH/24h), the mean minimal RpH (minRpH/24h) and mean of the time that RpH was below the threshold value of 6.0 (RpH⟨6.0/24h, min.). The highest RpH/24h (6.37±0.22) was observed in group EY and it was by 1.62% (p⟨0.05) and 1.27% (p⟨0.001) higher as compared with groups E and C, respectively. Also minRpH/24h (6.24±0.24) was highest in group EY and values were by 0.63% (p⟨0.001) and 0.65% (p⟨0.001) higher as compared with groups C and E, respectively. The shortest duration of RpH⟨6.0/24h, was recorded in group EY, and it was by 57.76% (p⟨0.05) and 47.87% shorter as compared with groups C and E, respectively. In conclusion, feed supplementation with EFE and Saccharomyces cerevisiae CNCM-1077 had beneficial effect on RpH.
外源性纤维分解酶（EFE）和酵母是饲料添加剂，可改善瘤胃中草料的消化，但它们对物理网胃参数的影响尚未得到充分研究。本研究旨在评估 EFE：内切-β-木聚糖酶（37x104 U/头/天）、内切纤维素酶（45x104 U/头/天）、内切-β-葡聚糖酶（12x104U/头/天）和活性酵母 - 酿酒酵母 CNCM-1077（10x109CFU/头/天）对奶牛网胃 pH（RpH）和温度（RT）的影响。将 9 头立陶宛红牛分配到 3 组（每组 3 头）：对照组（C）-无补充的农场日粮、酶组（E）-补充 EFE 的农场日粮、酶和活性酵母组（EY）-补充 EFE 和活性酵母的农场日粮。饲养试验持续 60 天。所有奶牛均配备网胃遥测 pH 和温度传感器装置。设备提供的数据用于计算平均 RpH（RpH/24h）、平均最小 RpH（minRpH/24h）和 RpH 低于 6.0 阈值的时间平均值（RpH⟨6.0/24h，min.）。EY 组的 RpH/24h 最高（6.37±0.22），比 E 组和 C 组分别高 1.62%（p⟨0.05）和 1.27%（p⟨0.001）。minRpH/24h（6.24±0.24）也在 EY 组中最高，与 C 组和 E 组相比，分别高 0.63%（p⟨0.001）和 0.65%（p⟨0.001）。RpH⟨6.0/24h 的持续时间最短的是 EY 组，与 C 组和 E 组相比，分别短 57.76%（p⟨0.05）和 47.87%。总之，饲料中添加 EFE 和酿酒酵母 CNCM-1077 对 RpH 有有益影响。
