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Title:Vpliv velikosti črede, načina reje ter eksterierja živali na dolgoživost in proizvodne lastnosti krav črno bele pasme
Authors:ID Virk, Tadej (Author)
ID Janžekovič, Marjan (Mentor) More about this mentor... New window
ID ŠKORJANC, DEJAN (Comentor)
Files:.pdf MAG_Virk_Tadej_2012.pdf (258,87 KB)
MD5: 4FE588480A2D46A96A402EB9D77C37FC
PID: 20.500.12556/dkum/0fe873c7-6200-4112-a1c7-b4f09042d070
 
Language:Slovenian
Work type:Master's thesis
Organization:FKBV - Faculty of Agriculture and Life Sciences
Abstract:Cilj preučevanja je bila primerjava proizvodnih lastnosti krav črno bele pasme med seboj glede na velikost črede, načina reje ter lastnosti zunanjosti. Zanimali so nas tudi vzroki izločitev molznic iz črede glede na način reje ter velikost črede. Skupno je bilo v primerjavo vključenih 1671 krav črno bele pasme, ki so prvič telile med 1. 1. 2004 in 31. 12. 2004. Živali se med seboj statistično značilno razlikujejo (p ≤ 0,05) glede na velikost črede v vseh primerjanih proizvodnih lastnostih (indeks dolgoživosti, starost živali, število produktivnih dni, starost ob prvi telitvi, število telitev, življenjska prireja mleka ter količina mleka na krmni dan). Pri primerjavi proizvodnih lastnosti glede na način reje se živali med seboj statistično značilno razlikujejo (p ≤ 0,05) samo v količini mleka na krmni dan in starosti ob prvi telitvi. Pri primerjavi proizvodnih lastnosti glede na linearne ocene zunanjosti se živali med seboj statistično značilno razlikujejo (p ≤ 0,05) v indeksu dolgoživosti, življenjski prireji mleka in količini mleka na krmni dan. Plodnostne motnje so najpogostejši vzrok za izločitev molznic iz črede, takoj za njimi pa so bolezni vimena (mastitis).
Keywords:molznice, dolgoživost, proizvodne lastnosti, ocene zunanjosti, velikost črede
Place of publishing:Maribor
Year of publishing:2012
PID:20.500.12556/DKUM-39241 New window
NUK URN:URN:SI:UM:DK:HBESCJAY
Publication date in DKUM:02.01.2013
Views:2415
Downloads:204
Metadata:XML DC-XML DC-RDF
Categories:FKBV
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Secondary language

Language:English
Title:Impact of herd size, housing systems and conformation traits on longevity and production traits of Holstein cows
Abstract:The aim of study was to compare productive traits of Holstein cattle among themselves based on herd size, housing systems and linear type traits. We were also interested in reasons for culling cows based on herd size and production system. Data included 1671 dairy cows of Holstein breed with first calving from 1.1.2004 to 31.12.2004. Statistically significant differences were found (p ≤ 0.05) among production traits such as longevity index, age, no. of productive days, age at first calving, no. of calvings, lifetime milk production and average amount of milk per milking day, respectively, based on herd size. When comparing production traits based on housing systems, we found statistically significant differences (p ≤ 0.05) in average amount of milk per milking day and age at first calving. Statistically significant differences were also found (p ≤ 0.05) in longevity index, lifetime milk production and in average amount of milk per milking day based on linear type traits. Reproductive problems followed by udder health presented two most common reasons for culling dairy cows.
Keywords:dairy cattle, longevity, production traits, conformation traits, herd size


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