有哪些信誉好的足球投注网站studies on the genetics of trotting performance in dutch trotters. ii. – a method for the breeding value estimation of trotter stallions研究遗传学的快步在荷兰猪、羊蹄的表现。.pdfVIP
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studies on the genetics of trotting performance in dutch trotters. ii. – a method for the breeding value estimation of trotter stallions研究遗传学的快步在荷兰猪、羊蹄的表现。
STUDIES ON THE GENETICS OF TROTTING PERFORMANCE IN DUTCH TROTTERS II. -A METHOD FOR THE BREEDING VAUJE ESTIMATION OF TROTTER STALLIONS D. MINKEMA Research Institute for Animal Husbandry « Schoonoord D Driebergseweg 10 d - Zeist, The Netherlands SUMMARY In order to select Trotter stallions on the basis of the performance of their progeny, an index has been developed. This index is based on the earnings of progeny, being in various stages of their trotting career. The earnings are corrected for annual fluctuations and for sex differences. The mean of each age class of progeny of a given stallion is corrected for the mean perfor- mance of the dams, by taking into account the regression of progeny performance on dam’s For each stallion the corrected mean of of the various classes performance. earnings progeny age are joined. For this purpose weighting factors are developed according to the selection index into account the number of in the various classes. theory, taking progeny age 1. -INTRODUCTION Only Trotter stallions with an excellent own trotting career are accepted for breeding purposes by the studbook of the Dutch Trotting Association. Besides their own performance also the merits of close relatives like parents, full and half sibs, are taken into account. As soon as possible during their active breeding life trotter stallions are judged on the performance of their progeny. A first judgement usually takes in the autumn of the in which the eldest of a stallion is place year
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