Utilization of estimated the breeding bulls
2002
Kaasiku, U. | Saveli, O. (Academical Agricultural Society, Tartu (Estonia))
This study was focused on utilization of A.I. bulls of the Estonian Red and the Estonian Holstein breed for breeding Estonian cattle. 213 Estonian Red and 278 Estonian Holstein bulls, whose estimated results of relative breeding value (RBV) on the basis of BLUP - Animal Model were published in the 3rd quarter of 1998, were involved in the analysis. The duration of using intensity of the breeding bulls was analyzed on the basis of birth year, the duration of using period, gene proportion and breeding value. In the results of the study it was ascertained, that the breeding bulls were used during too long time. From 1991 till 1998 the insemination with the semen of the bulls born in 1983-84 constituted 41.2 per cent in the Estonian Red breed and 31.2 per cent in the Estonian Holstein breed. This year the bulls of high breeding value (RBV110) are used mostly (41.2 per cent) in the Estonian Holstein breed and to the lesser extent (15.1 per cent) in the Estonian Red breed. The turnover of the generations was too slow and semen of the bulls from younger generation of relatively higher breeding value has not been much used for breeding. Semen of the bulls of low breeding value should be more strictly rejected
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