Estimation of (Co)Variances of Test Day Yields for First Lactation Holsteins in the United States
نویسندگان
چکیده
منابع مشابه
Indirect Estimation of (Co)Variance Functions for Test-Day Yields During First and Second Lactations in the United States
(Co)variance components for milk, fat, and protein yields during first and second lactations were estimated from test-day data from 23,029 Holstein cows from 37 herds in Pennsylvania and Wisconsin using a multitrait test-day model. Canonical transformation was used with an expectation-maximization algorithm. To allow description of (co)variances within and across yield traits and parities, four...
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15 صفحه اولEstimation of genetic parameters of weekly test-day milk yields and first lactation 305-day milk yield in Murrah buffaloes
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Deriving 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: 1999
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(99)75227-6