Dissertation
Dissertation > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > Livestock > Cow > A variety of purposes cattle > Dairy

Effects of N-hydroxymethyl-DL-methionine-Ca(N-HMM-Ca) on Ruminal Fermentation and Performance in Chinese-Holstein Cow

Author XiongChunMei
Tutor ZhangLi;HaoZhengLi;ZhengZhongChao
School Gansu Agricultural University
Course Animal Nutrition and Feed Science
Keywords Chinese Holstein cows N - hydroxymethyl- methionine calcium rumen environment Plasma metabolite Milk production Milk Ingredients
CLC S823.91
Type Master's thesis
Year 2004
Downloads 113
Quotes 4
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The 25 Chinese Holstein cows (lactation days 80 to 110 days, with an average milk yield of 25 ~ 30kg) were randomly divided into five groups, the control group (basal diet), the test group (basal diet 30gDL-Met) , testing two groups (basal diet 45gN-HMM-Ca), test three groups (basal diet 30gDL-Met 50gL-Lys), test four groups (basal diet 45gN-HMM-Ca 50gL-Lys), conducted feeding trials and digestion test and measuring added N-HMM-Ca on rumen environment, feed nutrient digestibility, plasma metabolites, and milk yield and composition effects. The results showed that: rumen ammonia nitrogen (NH3-N) concentration test two groups was significantly (P lt; 0.01) than the control group, the test group and test three groups; trial four were significantly (P lt; 0.01) than the control group and test three groups, other groups was not significant (P gt; 0.05). Total rumen volatile fatty acids (TVFA) and acetic acid concentration test and test two four groups were significantly (P lt; 0.05) higher, and there is a trend to increase the concentration of butyric acid (respectively, P = 0.118, P = 0.138), ruminal pH values ??were not affected. Test two groups and test four groups DM, ADF and CP digestibility was significantly (P lt; 0.05) higher and test a group. Four groups and test two experimental plasma albumin and total protein was significantly (P lt; 0.05) higher. Plasma urea nitrogen test two groups was significantly (P lt; 0.05) than the control group and the experimental group; other groups was not significant (P gt; 0.05). The plasma glucose, free fatty acids and total amino acid concentration difference was not significant (P gt; 0.05). Dry matter intake of each group was not significant (P lt; 0.05). Four groups and test two experimental groups milk yield was significantly (P lt; 0.05) higher, respectively, than the control group increased by 6.31% and 6.73%, other groups was not significant (P gt; 0.05). Four experimental fat corrected milk (FCM) was significantly (P lt; 0.05) higher and test a group increased 9.81% and 8.72%. Experiment two groups, four groups of butterfat test was significantly (P lt; 0.05) higher, respectively 6.25%, 6.55%, milk fat yield and daily prolific 128.63g 127.02g. Test two groups and four groups of butterfat test was significantly (P lt; 0.05) higher than the experimental group, respectively 5.60% and 5.92%, milk fat yield and daily prolific 105.50g 103.89g, other groups was not significant (P gt ; 0.05). Milk protein in each group was not significant (P gt; 0.05), two groups of test and test four milk protein yield than the control group and daily prolific 87.94g 86.57g, were increased by 9.27% ??(P = 0.062) and 9.12% ( P = 0.066), somatic cell count in milk, whole milk solids non-fat solids and differences between groups was not significant (P gt; 0.05). Thus concluded: on the one hand, N-HMM-Ca part to avoid rumen microbial degradation to form a protective Met to rumen Met; other hand, N-HMM-Ca ruminal degradation of part of the improvement fermentation, promote rumen microbial synthesis, thereby enhancing the role of these two aspects of milk production and milk ingredients.

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