Changes in dam characteristics of Holstein Friesian (HF) cows selected for Embryo Transfer in the United Kingdom (UK)

1997 ◽  
Vol 1997 ◽  
pp. 145-145
Author(s):  
M S Winters ◽  
M P Coffey

The use of Embryo Transfer (ET) in HF cattle breeding is now a routine technique. It provides an opportunity to increase the contribution of the dam to genetic progress in the population. The aim of this paper is to characterise the cows chosen as embryo donors, and to detect any changes in donor characteristics.

1996 ◽  
Vol 63 (3) ◽  
pp. 373-379 ◽  
Author(s):  
R. A. Mrode ◽  
G. J. T. Swanson ◽  
M. S. Winters

AbstractCountries, which import a significant amount of semen, embryos and animals, are faced with the problem of how properly to evaluate the animals in the national evaluation system when information on the foreign parents is generally missing. Additional problems arise when the foreign parents obtain an evaluation, usually on the basis of progeny, in the country of import with the result that there are two published evaluations for the animals in question. This paper presents a post-iterative method of incorporating foreign information into home country evaluations. The foreign information is initially converted to the same scale and base as in the home country using procedures recommended by the International Bull Evaluation Service. The method consists essentially of calculating a combined evaluation for animals with home and foreign information as a weighted average of yield deviations, parent averages and progeny contributions from the foreign and home countries. The combined evaluations are used to adjust the evaluations of progeny on the basis of formulae derived from the usual mixed model equations. The same principles were used to combine reliabilities from the respective home and foreign reliabilities. The results from the application of the method to the United Kingdom (UK) Holstein Friesian population are presented. There was re-ranking of both bulls and cows, especially foreign bulls with few UK daughters.


2009 ◽  
pp. 1-6 ◽  
Author(s):  
Nishan Fernando ◽  
Gordon Prescott ◽  
Jennifer Cleland ◽  
Kathryn Greaves ◽  
Hamish McKenzie

1990 ◽  
Vol 35 (8) ◽  
pp. 800-801
Author(s):  
Michael F. Pogue-Geile

1992 ◽  
Vol 37 (10) ◽  
pp. 1076-1077
Author(s):  
Barbara A. Gutek

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