Lactation Studies. VII. Heritability of Percentage of Complementary Milk
نویسندگان
چکیده
منابع مشابه
Linearity of heritability of Holstein first-lactation milk production.
The regression of daughter on dam first-lactation milk deviations from herd-mate averages was found to be linear from an analysis of 47,400 Holstein pairs. The linear equation was y=-25 .6 + .210 (x -27.6) and the quadratic equation was y-----25.6 + .208 (x -27.6) + .0000222 (x~-44131.4) with correlation coefficients, .18258 and .18268, respectively. These results suggest that selection respons...
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چکیده ندارد.
15 صفحه اولHeritability Estimates for First Lactation Milk Yield of Registered and Nonregistered Holstein Cows
Heritabilities of milk yield and fat test were estimated from first lactation records of 196,672 Holstein daughterdam pairs separately for registered and nonregistered cows for four milk yield groups and by years of freshening of the daughter. The model included herdseason and sire of the daughter. Heritability estimates were similar for registered and nonregistered cows averaging about .33 for...
متن کاملHeritability Estimates of Lactation Traits in Maltese Goat
Data on 657 lactation from 163 Maltese goat, collected over a 5-year period were analyzed by a mixed model to estimate the variance components for heritability. The considered lactation traits were: milk yield (MY) and lactation length (LL). Year, parity and type of birth (single or twin) were significant sources of variation for lactation length; on the other hand milk yield was significantly ...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1967
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(67)87500-3