The objective of this study was to determine the effects of dietary melamine on dry matter intake, milk yield and milk composition of lactating dairy cows, and to explored the regularity of deposition of melamine in milk. Nine multiparous Holstein cows in middle lactation [(160?21)d] were randomly allotted into 3 groups. Cows in the 3 groups were fed experimental diets supplemented with 0.1% (MEL1 group), 0.5% (MEL2 group) and 1.0% (MEL3 group) melamine (DM basis), respectively. The experiment lasted for 28 days. The results showed that dietary melamine had no significant influence on dry matter intake, milk yield, milk fat, milk protein and milk lactose of dairy cows (P>0.05), however, the urea content in milk was increased significantly with the increasing of dietary melamine (P<0.05). The melamine content in milk was increased significantly with the increasing of dietary melamine (P<0.05). The melamine contents in milk of MEL1, MEL2 and MEL3 groups were 5.48, 28.32 and 51.96 mg/L, and the melamine yields in milk of MEL1, MEL2 and MEL3 groups were 66.00, 420.05 and 745.20 mg/d, respectively. There was no significant difference in dietary melamine transfer rate in milk among all groups (P>0.05), and the average transfer rate was (0.51?0.1)%. The melamine residual were decreased rapidly after removing the melamine from diet, the residual level of melamine in milk was drop below 0.05 mg/L after the removed the melamine from diet on day 3. In conclusion, dietary melamine can significantly increase the residual level of melamine in milk, but has no significant influence on dry matter intake, milk yield and milk composition.
ZHAO Xiaowei
,
KHAS Erdene
,
WANG Jiaqi
,
BU Dengpan
,
WEI Hongyang
,
ZHOU Lingyun
,
WANG Jun
,
XU Xiaomin
. Effects of Dietary Melamine on Milk Composition and Its Regularity of Deposition in Milk[J]. Chinese Journal of Animal Nutrition, 2012
, (11)
: 2222
-2229
.
DOI: 10.3969/j.issn.1006-267x.2012.11.021
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