"RIV/00027014:_____/04:00009946!RIV/2005/MZE/M02005/N" . "554226" . "P\u00E1chov\u00E1, Eva" . . . "Praha" . "[4B19A9125CC1]" . "Praha" . "Anal\u00FDza produk\u010Dn\u00EDho v\u011Bku krav (LPL) hol\u0161t\u00FDnsk\u00E9ho plemene v\u00A0\u010Cesk\u00E9 republice byla provedena programem Survival Kit zalo\u017Een\u00E9m na Coxov\u011B regresi. Data zahrnovala 477669 krav poprv\u00E9 otelen\u00FDch v\u00A0obdob\u00ED 1990 a 2004. 15% dat bylo censorovan\u00FDch. Risk vy\u0159azen\u00ED krav byl definov\u00E1n jako sou\u010Din v\u00FDchoz\u00ED hazardn\u00ED funkce a funkce vysv\u011Btluj\u00EDc\u00EDch prom\u011Bnn\u00FDch. Model zahrnoval jeden \u010Dasov\u011B z\u00E1visl\u00FD efekt interakce po\u0159ad\u00ED a stadia laktace a t\u0159i \u010Dasov\u00E9 nez\u00E1visl\u00E9 efekty v\u011Bku p\u0159i prv\u00E9m otelen\u00ED, roku narozen\u00ED a efekt otce. Model vysv\u011Btloval 16% variability LPL. Nejv\u011Bt\u0161\u00ED risk pro vy\u0159azen\u00ED byl v\u00A0prv\u00E9 laktaci a to na za\u010D\u00E1tku a na konci laktace. Obecn\u011B se hazard sni\u017Eoval s\u00A0po\u0159ad\u00EDm laktace. Kr\u00E1vy s\u00A0vy\u0161\u0161\u00EDm v\u011Bkem p\u0159i 1. otelen\u00ED m\u011Bly vy\u0161\u0161\u00ED risk vy\u0159azen\u00ED. Efekt otce je pro produk\u010Dn\u00ED v\u011Bk krav v\u00FDznamn\u00FD."@cs . . . "RIV/00027014:_____/04:00009946" . "Analysis of length of productive life in Holstein cattle in Czech Republic"@en . "Analysis of length of productive life in Holstein cattle in Czech Republic" . . "Z(MZE0002701401)" . "D\u011Bdkov\u00E1, Ludmila" . "80-213-1197-5" . "An analysis of productive life in Holstein cattle in Czech Republic was performed using programs package Survival Kit, based on Cox regression. Data included 477 669 cows. The length of productive life (LPL) was observed between years of first calving 1990 and 2004. 15 % of cows were censored. The risk of being culled was defined as product of a baseline hazard function and a function of explanatory variables. The model included one time-dependent effect, a effect of interaction of lactation number andstage of lactation and three time-independent effects, age at first calving, year of birth and sire. The model explained 16 % of LPL variability. The highest risk of being culled was found for the first lactation and at the beginning of lactation and atthe end of the lactation. Generally, the hazard decreased with parity. The cows older at first calving had higher risk of being culled. The risk of being culled vary with years of birth. The effect of the sire plays a role in the question of longevity." . . "An analysis of productive life in Holstein cattle in Czech Republic was performed using programs package Survival Kit, based on Cox regression. Data included 477 669 cows. The length of productive life (LPL) was observed between years of first calving 1990 and 2004. 15 % of cows were censored. The risk of being culled was defined as product of a baseline hazard function and a function of explanatory variables. The model included one time-dependent effect, a effect of interaction of lactation number andstage of lactation and three time-independent effects, age at first calving, year of birth and sire. The model explained 16 % of LPL variability. The highest risk of being culled was found for the first lactation and at the beginning of lactation and atthe end of the lactation. Generally, the hazard decreased with parity. The cows older at first calving had higher risk of being culled. The risk of being culled vary with years of birth. The effect of the sire plays a role in the question of longevity."@en . "2"^^ . . "2"^^ . "Anal\u00FDza produk\u010Dn\u00EDho v\u011Bku hol\u0161t\u00FDnsk\u00FDch krav v \u010Cesk\u00E9 republice"@cs . "Analysis of length of productive life in Holstein cattle in Czech Republic"@en . "\u010Cesk\u00E1 zem\u011Bd\u011Blsk\u00E1 univerzita v Praze" . "Anal\u00FDza produk\u010Dn\u00EDho v\u011Bku hol\u0161t\u00FDnsk\u00FDch krav v \u010Cesk\u00E9 republice"@cs . "5"^^ . . "neuvedeno" . . . "Analysis of length of productive life in Holstein cattle in Czech Republic" . . "length of productive life;Holstein cattle;Survival Kit"@en . "Sustain Life Secure Survival II" . . . . "2004-09-22+02:00"^^ . . . .