Publisher : The Korean Society of Grassland and Forage Science
DOI : 10.5333/KGFS.2014.34.4.288
Title & Authors
Effects of Mixing Time for Total Mixed Rations using Corn Silage on Ruminal In situ Dry Matter Degradation and Milk Production in Dairy Cows Lim, Dong-Hyun; Ki, Kwang-Seok; Choi, Sun-Ho; Kim, Tae-Il; Park, Seong-Min; Park, Su-Bum; Kwon, Eung-Gi; Kim, Eun-Tae;
This study was conducted to evaluate the effect of mixing time for TMR (total mixed rations) mixed with corn silage on particle size, peNDF (physically effective neutral detergent fiber), laceration, and ruminal in situ dry matter degradation. The study also aimed to evaluate the effect of consumption of the TMR on the milk yield and milk components of mid-lactational dairy cows. TMRs were mixed for 30 minutes (T1) and 50 minutes (T2) using the same material. All samples were then analyzed with a Penn State Particle Size Separator (PSPS). The particle size of T1 was significantly lower in the bottom pan (8 mm>) than that of T2 (p<0.01). was significantly higher in T1 (17.18%) than in T2 (13.85%) (p<0.01). For ruminal in situ dry matter degradation of particle retention (>19 mm), no significant difference was found after 72 hours incubation, although T1 degradation was significantly higher after 24 hours incubation (p<0.01). Milk yield was no different between the groups of cows, whereas the milk fat from T1 fed cows was significantly higher (p<0.01). The results show that feeding TMR mixed for 30 minutes to dairy cows may improve the physical value of forage without negative effects on the milk yield and milk components.
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