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פותח על ידי קלירמאש פתרונות בע"מ -
Effects of persistency and production on the genetic parameters of milk and fat yield in Israeli-Holsteins.
Year:
1987
Source of publication :
Journal of Dairy Science
Authors :
בר-ענן, ראובן
;
.
ולר, יהודה
;
.
רון, מיכה
;
.
Volume :
70
Co-Authors:
Weller, J.I.
Ron, M.
Bar-Anan, R.
Facilitators :
From page:
672
To page:
680
(
Total pages:
9
)
Abstract:
Herd-years of Israeli-Holsteins were stratified into three groups by two criteria: mean annualized milk yield [365 (total lactations yield/calving interval)] and mean persistency, estimated as the ratio of daily milk production at the 5th mo postpartum to daily production during the postpartum peak period. The latter was taken as an indication of the relative environmental stress on the cow. Primi- and multiparous cows were analyzed separately. Genetic parameters were estimated for annualized milk and fat production at each production and persistency group. Heritabilities increased with a rise in production for both primiparous and multiparous cows, but the effect was greater for multiparous cows. Even though persistency and production were correlated, no clear trends were evident for stratification by persistency; thus, a relationship between stress and heritability was not established. Genetic correlations among stratification groups were between .7 and .9 for persistency and between .6 and .86 for production; thus, sire x environmental interaction was greater for production than for persistency stratification. Production in a given year can be used as a criterion for selecting herds to test progeny of young sires in the following year.
Note:
Related Files :
Animal
article
cattle
Fats
Female
Genetics
lactation
milk
pregnancy
Support, Non-U.S. Gov't
Support, U.S. Gov't, Non-P.H.S.
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More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26645
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:24
Scientific Publication
Effects of persistency and production on the genetic parameters of milk and fat yield in Israeli-Holsteins.
70
Weller, J.I.
Ron, M.
Bar-Anan, R.
Effects of persistency and production on the genetic parameters of milk and fat yield in Israeli-Holsteins.
Herd-years of Israeli-Holsteins were stratified into three groups by two criteria: mean annualized milk yield [365 (total lactations yield/calving interval)] and mean persistency, estimated as the ratio of daily milk production at the 5th mo postpartum to daily production during the postpartum peak period. The latter was taken as an indication of the relative environmental stress on the cow. Primi- and multiparous cows were analyzed separately. Genetic parameters were estimated for annualized milk and fat production at each production and persistency group. Heritabilities increased with a rise in production for both primiparous and multiparous cows, but the effect was greater for multiparous cows. Even though persistency and production were correlated, no clear trends were evident for stratification by persistency; thus, a relationship between stress and heritability was not established. Genetic correlations among stratification groups were between .7 and .9 for persistency and between .6 and .86 for production; thus, sire x environmental interaction was greater for production than for persistency stratification. Production in a given year can be used as a criterion for selecting herds to test progeny of young sires in the following year.
Scientific Publication
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