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Statements

Subject Item
n2:RIV%2F00027014%3A_____%2F04%3A00009946%21RIV%2F2005%2FMZE%2FM02005%2FN
rdf:type
n9:Vysledek skos:Concept
dcterms:description
Analýza produkčního věku krav (LPL) holštýnského plemene v České republice byla provedena programem Survival Kit založeném na Coxově regresi. Data zahrnovala 477669 krav poprvé otelených v období 1990 a 2004. 15% dat bylo censorovaných. Risk vyřazení krav byl definován jako součin výchozí hazardní funkce a funkce vysvětlujících proměnných. Model zahrnoval jeden časově závislý efekt interakce pořadí a stadia laktace a tři časové nezávislé efekty věku při prvém otelení, roku narození a efekt otce. Model vysvětloval 16% variability LPL. Největší risk pro vyřazení byl v prvé laktaci a to na začátku a na konci laktace. Obecně se hazard snižoval s pořadím laktace. Krávy s vyšším věkem při 1. otelení měly vyšší risk vyřazení. Efekt otce je pro produkční věk krav významný. 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.
dcterms:title
Analysis of length of productive life in Holstein cattle in Czech Republic Analysis of length of productive life in Holstein cattle in Czech Republic Analýza produkčního věku holštýnských krav v České republice
skos:prefLabel
Analysis of length of productive life in Holstein cattle in Czech Republic Analýza produkčního věku holštýnských krav v České republice Analysis of length of productive life in Holstein cattle in Czech Republic
skos:notation
RIV/00027014:_____/04:00009946!RIV/2005/MZE/M02005/N
n4:strany
neuvedeno
n4:aktivita
n17:Z
n4:aktivity
Z(MZE0002701401)
n4:dodaniDat
n8:2005
n4:domaciTvurceVysledku
n6:4231368 n6:6391141
n4:druhVysledku
n5:D
n4:duvernostUdaju
n12:S
n4:entitaPredkladatele
n15:predkladatel
n4:idSjednocenehoVysledku
554226
n4:idVysledku
RIV/00027014:_____/04:00009946
n4:jazykVysledku
n18:eng
n4:klicovaSlova
length of productive life;Holstein cattle;Survival Kit
n4:klicoveSlovo
n16:Holstein%20cattle n16:Survival%20Kit n16:length%20of%20productive%20life
n4:kontrolniKodProRIV
[4B19A9125CC1]
n4:mistoKonaniAkce
Praha
n4:mistoVydani
Praha
n4:nazevZdroje
Sustain Life Secure Survival II
n4:obor
n10:GI
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
2
n4:rokUplatneniVysledku
n8:2004
n4:tvurceVysledku
Páchová, Eva Dědková, Ludmila
n4:typAkce
n20:EUR
n4:zahajeniAkce
2004-09-22+02:00
n4:zamer
n19:MZE0002701401
s:numberOfPages
5
n13:hasPublisher
Česká zemědělská univerzita v Praze
n11:isbn
80-213-1197-5