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Beef Production from Different Dairy Breeds and Dairy Beef by Z. Reklewski (auth.), G. J. More O’Ferrall (eds.)

By Z. Reklewski (auth.), G. J. More O’Ferrall (eds.)

This e-book comprises the lawsuits of a Seminar "Beef creation from diverse dairy breeds and dairy red meat crosses", held in eire on April 13-15, 1981, lower than the auspices of the fee of the ecu groups (CEC) as a part of the ecu groups (EC) programme for red meat creation study. The CEC needs to thank these representatives of eire who took accountability for the service provider and behavior of this Seminar, particularly Professor E.P. Cunningham, Dr. G.J. extra O'Ferrall (local organiser), Dr. Patricia McGlaughlin and particularly, thank you are as a result of Dr. McGlaughlin Mr. R. Barlow. and Mr. Barlow for his or her recording of the discussions. Professor Ian Gordon of the college of Agriculture, kindly made to be had the amenities of Lyons condominium, college collage, for the Seminar. thank you also are accorded to the Chairmen of the periods Professor D. Smidt, Dr. R.B. Thiessen, Professor A. Neimann­ Sorensen, Professor E.P. Cunningham, and to all of the individuals who provided papers and participated within the discussions. X pursuits The goals of the Seminar have been to study fresh comparisons of Holstein and Friesian traces with different dairy breeds for pork and veal construction; to examine using red meat breeds for crossing on dairy herds in a variety of EEC nations, and to ascertain the commercial and genetic stability among milk and pork qualities in twin goal bull checking out and selection.

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Additional info for Beef Production from Different Dairy Breeds and Dairy Beef Crosses: A Seminar in the CEC Programme of Coordination of Research on Beef Production held at Castleknock, Co. Dublin, Ireland, April 13–15, 1981

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Langholz: Is there any information available about the dams to which bulls were mated. How was it assured that no bias was 28 possible by selective matings between cows within farms, andjor between regions ? Flanagan: No bias was possible. The cows to which proven and young unproven bulls are mated is predetermined, and then selection within groups is random. All animals were purchased subsequently, unless the price was extremely high. Langholz: Was there any possibility of selective feeding of animals by farmers ?

1961. Selection indexes for dairy cattle. Zeitschrift fur Tierzuchtung und Zuchtungsbiologie 75, 249-261. K. 1977. Vergleich nordamerykanischer Holstein Friesians mit niederlandischer Schwarz und Rotbunten. Tierzuchter 9, 29, 374-378. 2G COMMENTS ON DR. REKLEWSKI'S PAPER Chairman: Prof. Dr. D. Smidt Thiessen: Results from breed comparisons have shown that the greatest variation in production traits, particularly food efficiency, is observed when comparisons are made at the same bodyweight. In view of the influence of differences in mature size, I would like to see comparisons made at the same age, and also by regression analysis to the same degree of fatness.

Those populations had been selected exclusively for milk production traits. This may confirm Lush's (1961) opinion that selection directed at the improvement of one trait may, in reality, be a selection for an index covering many traits due to correlated responses. Of course, one cannot, evaluating the results obtained from generation F 1 , exclude the influence of heterosis, which would make it difficult to estimate the beef value of the tested strains. The final determination of their genetical value will only be possible when the results obtained for generation R 1 are available.

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