Serum and Ruminal Fluid Characteristics of Beef Cows Grazing Oat Pastures and Supplemented with or Without Lasalocid

1988 ◽  
Vol 66 (7) ◽  
pp. 1746 ◽  
Author(s):  
N. K. Chirase ◽  
L. W. Greene ◽  
D. K. Lunt ◽  
J. F. Baker ◽  
R. E. Knutson
Keyword(s):  
Beef Cows ◽  
Ruminal Fluid ◽  
Fluid Characteristics

scholarly journals Effects of Salinomycin and Monensin on Feed Conversion of Concentrate and Ruminal Fluid Characteristics in Fattening Holstein Steers

1987 ◽  
Vol 58 (5) ◽  
pp. 396-402
Author(s):  
Masaaki WAKITA ◽  
Yasuo KOBAYASHI ◽  
Sadao HOSHINO ◽  
Yoshimune KITABAYASHI ◽  
Motoo HASHIMURA ◽  
...  
Keyword(s):  
Feed Conversion ◽  
Ruminal Fluid ◽  
Fluid Characteristics

scholarly journals PSXI-17 Influence of hops on in vitro ruminal fermentation of corn grain

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 408-408
Author(s):  
Yamicela Castillo-Castillo ◽  
Raul Solis ◽  
Armando A Quintana ◽  
Claudio Arzola ◽  
Ana Luisa Olivas-Palacios ◽  
...  
Keyword(s):  
Methane Production ◽  
Beef Cows ◽  
Gas Production ◽  
Co2 Production ◽  
Ruminal Fermentation ◽  
Ruminal Fluid ◽  
Fermentation Parameters ◽  
Corn Grain

Abstract An in vitro incubation was carried out to evaluate the potential of hops (Humulus lupulus) as an alternative to antibiotics for upgrading animal production. Whole pellets of hops (Variety Galena) were ground and incubated in a batch culture of ruminal fluid (2000 mg of ground corn grain + 10 mL of fresh rumen liquor). Ruminal fluid was collected from two beef cows through an esophageal tube. The hops were incubated by 24 h at levels of 0, 800, 1600 and 2400 µg/mL. Data were analyzed statistically by analysis of variance using PROC GLM of SAS. Hops addition linearly decreased (P < 0.01) gas production (GP; 90.89, 61.73, 36.63 and 28.37 µmol/g respectively) and methane production (MP; 9.76, 1.70, 1.30 and 0.46 µmol/g respectively). The CO2 production linearly increased as levels of hops increased (P < 0.02; 87.5, 88.4, 98.1 and 99.3 µmol/g respectively). The ammonia-N production was reduced in treatment 2 with respect to other treatments (P < 0.03; 12.6, 9.2, 13.7 and 13.5 µmol/g). Effects on ruminal fermentation of corn grain were dose dependent of hops. Addition of hops in ruminant feeding may offer a means to decrease ruminal methane production. Further research is needed to test efficacy of hops on other in vivo rumen-fermentation parameters.

Forage-Based Heifer Development Program for North Florida

EDIS ◽  
2018 ◽  
Vol 2018 (5) ◽  
Author(s):  
Jose C.B. Dubeux ◽  
Nicolas DiLorenzo ◽  
Kalyn Waters ◽  
Jane C. Griffin
Keyword(s):  
Development Program ◽  
Warm Season ◽  
Beef Cows ◽  
Good News ◽  
Cool Season ◽  
Beef Industry ◽  
Performance Targets ◽  
Grazing Systems ◽  
Heifer Development ◽  
Reducing Costs

Florida has 915,000 beef cows and 125,000 replacement heifers (USDA, 2016). Developing these heifers so that they can become productive females in the cow herd is a tremendous investment in a cow/calf operation, an investment that takes several years to make a return. The good news is that there are options to develop heifers on forage-based programs with the possibility of reducing costs while simultaneously meeting performance targets required by the beef industry. Mild winters in Florida allows utilization of cool-season forages that can significantly enhance the performance of grazing heifers. During the warm-season, integration of forage legumes into grazing systems will provide additional nutrients to meet the performance required to develop a replacement heifer to become pregnant and enter the mature cow herd. In this document, we will propose a model for replacement heifer development, based on forage research performed in trials at the NFREC Marianna.   

Numerical analysis and explore of asymmetrical fluid flow in a two-sided lid-driven cavity

2020 ◽  
Vol 14 (3) ◽  
pp. 7269-7281
Author(s):  
El Amin Azzouz ◽  
Samir Houat
Keyword(s):  
Velocity Ratio ◽  
Two Dimensional ◽  
Lower Side ◽  
Square Cavity ◽  
Driven Cavity ◽  
Parallel Motion ◽  
Bottom Cavity ◽  
Secondary Vortices ◽  
Volume Method ◽  
Fluid Characteristics

The two-dimensional asymmetrical flow in a two-sided lid-driven square cavity is numerically analyzed by the finite volume method (FVM). The top and bottom walls slide in parallel and antiparallel motions with various velocity ratio (UT/Ub=λ) where |λ|=2, 4, 8, and 10. In this study, the Reynolds number Re1 = 200, 400, 800 and 1000 is applied for the upper side and Re2 = 100 constant on the lower side. The numerical results are presented in terms of streamlines, vorticity contours and velocity profiles. These results reveal the effect of varying the velocity ratio and consequently the Reynolds ratio on the flow behaviour and fluid characteristics inside the cavity. Unlike conventional symmetrical driven flows, asymmetrical flow patterns and velocity distributions distinct the bulk of the cavity with the rising Reynolds ratio. For λ>2, in addition to the main vortex, the parallel motion of the walls induces two secondary vortices near the bottom cavity corners. however, the antiparallel motion generates two secondary vortices on the bottom right corner. The parallel flow proves affected considerably compared to the antiparallel flow.

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