This study was conducted to investigate the effect of feed ingredients on in vitro ruminal fermentation and methane production potential. For in vitro culture of mixed rumen microorganisms, ruminal fluid as an inoculum was collected from three cannulated Holstein steers(average BW 800kg) before thei...
This study was conducted to investigate the effect of feed ingredients on in vitro ruminal fermentation and methane production potential. For in vitro culture of mixed rumen microorganisms, ruminal fluid as an inoculum was collected from three cannulated Holstein steers(average BW 800kg) before their morning feeding on the day. The feed ingredients used for the in vitro study were corn grain, corn flake, wheat grain, wheat flour, lupin, tapioca, Mablelist, corn distiller, rapeseed meal, coconut meal, perilla meal, tapioca mix distiller, palm kernel meal, cotton seed hull, corn hull, armond hull. Dry matter degradation rates of lupine, wheat grain and wheat flour were about 80% at the end of the culture in which degradable organic matter of substrates is most likely degraded. Dry matter degradation rates of wheat and lupin in feed grains, rapeseed meal in feed plant protein, and corn hull in feed brans were highest among feed ingredients. The pH of cultures of all feed ingridients was above 6.0 during whole incubation times, hence there was no inhibition of microbial growth within the rumen. At the end of incubation whole wheat showed the lowest pH, but pH values of tapioca mix distiller and almond hull were higher than those of the other groups. Ammonia concentrations in all treatments except for corn and corn flake were tended to increase as incubation time increased. Total gas and methane production increased as incubation time increased in all treatments, while tapioca mix distiller and almond hull showed the lowest increment. Methane concentration in total gas production in all treatments except for corn flake was also increased as incubation time increased. Total VFA also increased as incubation time increased. In addition, A / P ratio showed highest in the palm kernel meal and almond hull while corn distiler was the lowest A / P ratio. The results indicate that wheat grain, wheat flour and lupin among the feed grains, rapeseed meal among the feed plant proteins, and corn hull among feed brans improve ruminal fermentation and reduce methane, especially, wheat flour among the 16 feed ingredients used in the study is in the most.
This study was conducted to investigate the effect of feed ingredients on in vitro ruminal fermentation and methane production potential. For in vitro culture of mixed rumen microorganisms, ruminal fluid as an inoculum was collected from three cannulated Holstein steers(average BW 800kg) before their morning feeding on the day. The feed ingredients used for the in vitro study were corn grain, corn flake, wheat grain, wheat flour, lupin, tapioca, Mablelist, corn distiller, rapeseed meal, coconut meal, perilla meal, tapioca mix distiller, palm kernel meal, cotton seed hull, corn hull, armond hull. Dry matter degradation rates of lupine, wheat grain and wheat flour were about 80% at the end of the culture in which degradable organic matter of substrates is most likely degraded. Dry matter degradation rates of wheat and lupin in feed grains, rapeseed meal in feed plant protein, and corn hull in feed brans were highest among feed ingredients. The pH of cultures of all feed ingridients was above 6.0 during whole incubation times, hence there was no inhibition of microbial growth within the rumen. At the end of incubation whole wheat showed the lowest pH, but pH values of tapioca mix distiller and almond hull were higher than those of the other groups. Ammonia concentrations in all treatments except for corn and corn flake were tended to increase as incubation time increased. Total gas and methane production increased as incubation time increased in all treatments, while tapioca mix distiller and almond hull showed the lowest increment. Methane concentration in total gas production in all treatments except for corn flake was also increased as incubation time increased. Total VFA also increased as incubation time increased. In addition, A / P ratio showed highest in the palm kernel meal and almond hull while corn distiler was the lowest A / P ratio. The results indicate that wheat grain, wheat flour and lupin among the feed grains, rapeseed meal among the feed plant proteins, and corn hull among feed brans improve ruminal fermentation and reduce methane, especially, wheat flour among the 16 feed ingredients used in the study is in the most.
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