|
KMID : 0900919970210020191
|
|
Korean journal of Animal Reproduction
1997 Volume.21 No. 2 p.191 ~ p.195
|
|
|
Herd Reproductive Performance Related to Urea Nitrogen Concentration in Bulk Milk
|
|
Park Jin-Ki
Lee Jung-Gyu
Lee Myung -Shik
|
|
|
Abstract
|
|
|
|
The objective of this study were to compare two methods of analysis of milk urea nitrogen (MUN) and to relate conentration of MUN to pregnancy rate in dairy cows. The Azotest and Sigma method for MUN analysis were compared. The Azotest consistently underestimated the Sigma values for same samples, except for those in rank 3. The CV for the Azotest, within each rank, were less than 15%, demonstrating acceptable repeatability of the Azotest within a rank. Concentrations of MUN higher or lower than MUN in rank 3 and 4 were associated with decreased pregnancy rate. Mun concentrations in rank 5 and 6 were associated with a, pp.oximately a 16 percentage point decrease in pregnancy rate. Mun concentrations in rank 5 and 6 were associated with a, pp.oximately a 16 percentage point decrease in pregnancy rate after AI in dairy cow. This results suggest that Azotest may be benificial to dairy producers to monitor urea nitrogen concentration in their herd in efforts to maintain or improve reproductive efficiency.
|
|
|
KEYWORD
|
|
|
Pregnancy rate, Milk urea nitrogen, Dairy cattle, Azotest
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|
|