Estimating Effects of Permanent Environment, Lactation Stage, Age, and Pregnancy on Test-Day Yield
نویسندگان
چکیده
منابع مشابه
Estimating Effects of Permanent Environment, Lactation Stage, Age, and Pregnancy on Test-Day Yield
Test-day variances for permanent environmental effects within and across parities were estimated along with lactation stage, age, and pregnancy effects for use with a test-day model. Data were test-day records for calvings since 1990 for Jerseys and for Holsteins from California, Pennsylvania, Texas, and Wisconsin. Single-trait repeatability models were fitted for milk, fat, and protein test-da...
متن کاملWithin-herd effects of age at test day and lactation stage on test-day yields.
Variance ratios were estimated for random within-herd effects of age at test day and lactation stage, on test-day yield and somatic cell score to determine whether including these effects would improve the accuracy of estimation. Test-day data starting with 1990 calvings for the entire US Jersey population and Holsteins from California, Pennsylvania, Wisconsin, and Texas were analyzed. Test-day...
متن کاملDeriving Lactation Yields from Test-Day Yields Adjusted for Lactation Stage, Age, Pregnancy, and Herd Test Date
Lactation records for milk, fat, and protein yields were calculated from test-day data adjusted for the effects of lactation stage, age, previous days open, days pregnant, and test-day class (herd, test date, and milking frequency). Those lactation records reflect the improved accounting of environmental effects from a test-day model and can be combined with historical lactation records. Test-d...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2002
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(02)74076-9