Usporedba modela laktacijskih krivulja u ovaca

master's thesis

• Title (english): Comparasion of lactation curve models in sheep
• Author: Sara Barković
• Mentor: Alen Džidić (mentor)
• Committee member: Alen Džidić (predsjednik povjerenstva)
• Committee member: Maja Ferenčaković (član povjerenstva)
• Committee member: Dragica Šalamon (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Animal Science); Zagreb
• Defense date and country: 2020-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Cilj ovog rada bio je utvrditi najbolji odgovarajući model laktacijskih krivulja za količinu mlijeka, sadržaj proteina i masti za istarsku i pašku ovcu. Podaci su prikupljeni od Ministarstva poljoprivrede za 2016., 2017. i 2018. godinu. Koristili smo pet laktacijskih modela u ovome radu: Wood, Wilmink, Ali-Schaeffer, Guo-Swalve te Kubični model. Za statističku analizu podataka korišten je statistički program SAS 9.4 u kojem je izračunati i koeficijent determinacije za mlijeko koji se kretao od 0,726 do 0,884, za razinu mliječne masti od 0,898 do 0,971, te za bjelančevine u mlijeku od 0,928 do 0,992. U radu je pokazano da su Wood, Ali-Schaeffer te Guo-Swalve modeli koji najbolje opisuju laktacijsku krivulju za istarsku i pašku ovcu, dok su druga dva (Wilmink i Kubični) neznatno slabiji.

Abstract (english)

The goal of this work was to determine the most suitable lactation curve model for milk, protein and fat from Istrian and Pag sheep. All data were acquired from the Ministry of Agriculture in the period from the year 2016 to 2018. Five different lactation models were use din this thesis: Wood, Wilmink, Ali-Schaeffer, Guo-Swalve and Cubic. Statistical program SAS 9.4 was used for data analysis where coefficient of determination was calculated for milk ranging from 0,726 to 0,884, milk fat content from 0,898 to 0,971 and milk protein content from 0,928 to 0,992. It was concluded that Wood, Ali-Schaeffer and Guo-Swalve models are the most efficient in describing lactation curve for Istrian and Pag sheep, while Wilmink and Cubic were a bit less efficient.

• Keywords: laktacijska krivulja; istarska ovca; paška ovca; modeli
• Keywords (english): lactation curve; Istrian sheep; Pag sheep; models
• Language: croatian
• URN:NBN: urn:nbn:hr:204:226059
• Study programme: Title: Animal Genetics and Breeding; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka genetike i oplemenjivanja životinja (magistar/ magistra inženjer/inženjerka genetike i oplemenjivanja životinja)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-12-09 12:13:45