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Effects of 2-Hydroxy-4-Methionine Isopropyl on Rumen Fermentation and Production Performance of Holstein Cows

Author: LiuHongBo
Tutor: HanZhaoYu
School: Nanjing Agricultural College
Course: Agricultural Extension
Keywords: dairy cow 2-hydroxy-4-methionine isopropyl rumen fermentation performance
CLC: S823.8
Type: Master's thesis
Year: 2011
Downloads: 6
Quote: 0
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Abstract


The present study was conducted to investigate the effects of different levels of HMBi on rumen fermentation and milk production and milk composition of early-lactation cows to provide experimental basis for the application of HMBi on cow industryExperiment 1:The present study was conducted to investigate the effect of HMBi on rumen fermentation in vitro. Test is divided into three treatment groups, including control group, treatmentⅠand treatmentⅡ. The treatment groups were added 1 mg and 3 mg of HMBi respectively. The results show us that the pH of treatment groups were lower than control expert for time 24.Treatment groups’gas production (GP) at every time were higher than control and extremely significant higher than control at 3h and 6h(P＜0.01).DMD of treatments was extremely significant higher than control at 6 h (P＜0.01), and treatment I was extremely significant higher than control (P＜0.01), and treatmentⅡwas significant higher than control (P＜0.05) at 12 h. The MCP of treatment groups was higher than control expert for that of treatmentⅠat 24 h. With time of fermentation goes by the lactate of treatments was significant (P＜0.05) or extremely significant (P＜0.01) lower than that of control. The ammonia-N of treatments was higher than control at every time. The acetate, propionate, butyrate, isobutyrate, valerate, isovalerate and TVFA of treatments were higher than that of control. Which we can confirm from this trial is that the HMBi could improve the rumen fermentation and the effect is amount and time related.Experiment 2:According to fetal, milk yield and days in milk, thirty Chinese-Holstein cows (milk yield more than 25 kg) were chosen and were divided into 3 groups which were control, treatmentⅠandⅡ(10 cows per treatment). Before the trial started there was a 6 days adaptation and the trial lasted 84 days. No HMBi was included in the diet of control and the treatments were fed 16 g/d and 25 g/d of HMBi respectively. The results of the trial showed us that the milk production of treatments was 1.07 kg and 0.99 kg higher than control respectively. Milk composition of treatment I was raised but the differences were insignificant (P＞0.05). The milk composition of treatmentⅡwas raised expert for milk protein and the differences were insignificant (P＞0.05). The SCC of treatments was decreased and SCC of treatmentⅡwas significant lower than control (P＜0.05). The treatments’milk ketone were decreased by 28.08% and 24.48% respectively and the differences were extremely significant (P＜0.01). The MUN of treatments was decreased by 19.62% and 22.65% respectively,the differences were extremely significant (P＜0.01). It could be confirmed that the HMBi could improve the energy and protein metabolism and the milk production, milk composition of early-lactation Holstein Cows, the effect is amount related.

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > Livestock > Cow > Variety
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