منابع مشابه
Ranking Dairy Sires by a Linear Programming Dairy Farm Model
Dairy sires were ranked for overall merit by an average daughter's contribution to farm net profit. Biological characteristics of sires and economic factors of a dairy farm were linked by linear programming. Availability and constraints of resources were in the model. Average daughter's returns over variable costs attributable to sire proofs for several traits was the measure of sire's net meri...
متن کاملProgeny test for AI-sires based on Held results
In Germany the estimation of breeding values of young boars and sows is based on their own data for daily gain and backfat as well as fulland/or half-sib information on carcase traits. In breeding companies young boars are often tested under test station conditions using individual pens to get information on feed conversion while gilts are raised in groups and tested at 90 kg of weight for life...
متن کاملDairy Cattle by Exploiting Progeny Testing
We have exploited “progeny testing” to map quantitative trait loci (QTL) underlying the genetic variation of milk production in a selected dairy cattle population. A total of 1,518 sires, with progeny tests based on the milking performances of > 150,000 daughtersjointly, was genotyped for 159 autosomal microsatellites bracketing 1645 centimorgan or approximately two thirds of the bovine genome....
متن کاملGrowth of crossbred progeny of polled Hereford sires divergently selected for yearling weight and maternal ability.
Polled Hereford sires (n = 47) were divergently selected on published yearling weight (YW) and maternal (MAT) expected progeny differences (EPD) and mated to grade Angus cows to produce 457 calves in five spring calf crops. Sires selected for high and low YW differed by an average of 6.3 kg in YW EPD and those selected for high and low MAT differed by an average of 4.0 kg in MAT EPD based on 19...
متن کاملthe washback effect of discretepoint vs. integrative tests on the retention of content in knowledge tests
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ژورنال
عنوان ژورنال: Hereditas
سال: 2010
ISSN: 0018-0661
DOI: 10.1111/j.1601-5223.1936.tb02645.x