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undergraduate thesis
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COMPARISON OF LONGEVITY PARAMETERS OF DAIRY COWS IN OSIJEK-BARANJA COUNTY
Tajana Petrić (2016)
Josip Juraj Strossmayer University of Osijek
Faculty of agriculture
DEPARTMENT FOR ANIMAL HUSBANDRY
Metadata
TitleUSPOREDBA POKAZATELJA DUGOVJEČNOSTI MLIJEČNIH KRAVA NA PODRUČJU OSJEČKO-BARANJSKE ŽUPANIJE
AuthorTajana Petrić
Mentor(s)Nikola Raguž (thesis advisor)
Abstract
Glavni cilj ovoga rada bio je analiza i usporedba pokazatelja dugovječnosti holštajn i simentalskih krava u Osječkoj-baranjskoj županiji. Dugovječnost je kvantificirana koristeći dvije metode. Uporabom najbolje linearne nepristrane procjene (BLUP) analizirani su parametri dugovječnosti samo onih krava koje su imale poznatu ukupnu dužinu produktivnog vijeka. Uporabom metode analize preživljavanja primjenjiv je Weibull model proporcionalnih rizika koji omogućava analizu dugovječnosti i onih krava koje se još uvijek nalaze u proizvodnji. Na području Osječko-baranjske županije, simentalska pasmina ostvarila je duži produktivni vijek kao i veći broj laktacija u odnosu na holštajn pasminu. Prosječna starost pri prvom teljenju bila je podjednaka u obje pasmine i iznosila je oko 27 mjeseci. Veća ukupna životna proizvodnja mlijeka ostvarena je u holštajn pasmine. Najveći broj izlučenja u obje je pasmine ostvaren nakon prve laktacije. Dobiveni rezultati mogli bi dati doprinos u ispitivanju opravdanosti uvažavanja i vrednovanja dugovječnosti u selekcijskom indeksu za ukupno vrednovanje goveda.
Keywordslongevity cows selection comparison Osijek-Baranja county.
Parallel title (English)COMPARISON OF LONGEVITY PARAMETERS OF DAIRY COWS IN OSIJEK-BARANJA COUNTY
Committee MembersPero Mijić (committee chairperson)
Boris Lukić (committee member)
GranterJosip Juraj Strossmayer University of Osijek
Faculty of agriculture
Lower level organizational unitsDEPARTMENT FOR ANIMAL HUSBANDRY
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Agronomy
Animal Husbandry
Study programme typeuniversity
Study levelundergraduate
Study programmeAgriculture; specializations in: Agroeconomics, Plant production, Mechanization, Zootechnique, Horticulture
Study specializationAgroeconomics
Academic title abbreviationuniv. bacc. ing. agr.
Genreundergraduate thesis
Language Croatian
Defense date2016-09-23
Parallel abstract (English)
This study focuses on analysis and comparison of longevity parameters in Holstein and Simmental cattle in Osijek-Baranja county. The main objective was to quantify the parameters that describe the longevity data. Longevity was analysed using two different methods. Survival analysis used all informations on the length of productive life including censored observations too. Linear models considered culled animals only. In Osijek-Baranja county, Simmental breed had longer length of productive life as well as higher number of lactations in compare to Holstein cows. Average age at first calving was almost equal for both breeds (27 months). Higher lifetime milk yield was observed in Holstein breed. The highest proportion of cullings was determined after the first lactation for both breeds.Obtained results could contribute in researching of adequacy of appreciation and evalutaion for longevity in selection index for total genetic evaluation of cattle.
Parallel keywords (Croatian)dugovječnost krave usporedba selekcija Osječko-baranjska županija.
Resource typetext
Access conditionOpen access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
Notezavršni rad
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:151:461539
Repositoryhttps://repozitorij.pfos.hr