Production Differences Between Registered Cows and Their Nonregistered Herd-Mates

Within-herd contemporary comparisons of the first-lactation production of registered and nonregistered cows in herds enrolled in the New York Dairy Herd Improvement Associations suggest only small genetic differences between registered and nonregistered cows. In general, the registered Holsteins exc...

Full description

Saved in:
Bibliographic Details
Published in:Journal of dairy science 1965-07, Vol.48 (7), p.962-967
Main Authors: Van Vleck, L.D., Burke, J.D.
Format: Article
Language:English
Subjects:
Animals
Breeding
Cattle
Female
Lactation
Old Medline
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Within-herd contemporary comparisons of the first-lactation production of registered and nonregistered cows in herds enrolled in the New York Dairy Herd Improvement Associations suggest only small genetic differences between registered and nonregistered cows. In general, the registered Holsteins exceeded in production their nonregistered herd-mates, whereas the nonregistered cows had a slight advantage over their registered herd-mates for the Ayrshire, Guernsey, and Jersey breeds. Artificially sired cows had consistently higher production than their naturally sired herd-mates for all breeds. A definite increase in this advantage was noted for Holsteins in more recent years. No trend was apparent in the comparison of artificially sired registered and nonregistered cows for any of the breeds.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(65)88369-2